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ID Date Authorup Type Category Subject
  13578   Wed Jan 24 19:17:06 2018 johannesUpdateDAQc1auxex2 startup behavior

I compiled the burt binaries on c1auxex2 which took a little fiddling with dependencies and paths but nothing too major. The complete local epics folder (/opt/epics/) which contains the base epics binaries, modbus and burt for 32-bit linux has been copied to the shared drive at /opt/rtapps/epics-3.15.5. They belong to the most recent stable release. This was so we can now automatically call burt after the IOC initialization on c1auxex2 to restore the backed-up channel values.

I also copied the database definition and modbus instruction files to /cvs/cds/caltech/target/c1auxex2, from where they are now being read upon IOC initialization. This is an excerpt of the service file:

#ExecStart=/usr/bin/procServ -f -L /home/controls/modbusIOC/modbusIOC.log -p /run/modbusioc.pid 8008 /opt/epics/modules/modbus/bin/linux-x86/modbusApp /cvs/cds/caltech/target/c1auxex2/ETMXaux2.cmd   <-- Contains logging to file, see note 1)
ExecStart=/usr/bin/procServ -f -p /run/modbusioc.pid 8008 /opt/epics/modules/modbus/bin/linux-x86/modbusApp /cvs/cds/caltech/target/c1auxex2/ETMXaux2.cmd <-- Initializes the EPICS IOC with Modbus support
ExecStop=/bin/kill -9 ` cat /run/modbusioc.pid` <-- Kills the detached process by its process ID
ExecStartPost=/bin/bash -c "/opt/epics/extensions/bin/linux-x86/burtwb -f /opt/rtcds/caltech/c1/burt/autoburt/latest/c1auxex.snap" <-- Restores general channel values
ExecStartPost=/bin/bash -c "/opt/epics/extensions/bin/linux-x86/burtwb -f /opt/rtcds/caltech/c1/medm/MISC/ifoalign/burt/ETMX.snap" <-- Restores PIT and YAW values from align MEDM screen
ExecStartPost=/bin/bash -c ". /home/controls/modbusIOC/ETMXaux2.sh" <-- Enables writing to PIT and YAW DAC channels, see note 2)

Note 1) I removed the logging to file for now because I noticed that if there are Acromag communication issues the logfile tends to grow in size VERY fast. In the cryo lab is had gotten to over 70GB just over the winter break. I don't think it's absolutely necessary to have it, and if diagnostics are needed we can easily uncomment it temporarily.

Note 2) I modified the static EPICS records of the four OSEM bias adjust channels so they won't start updating as soon as the IOC starts up (and before the channel defaults are restored by burt). This was done by setting the OMSL (output mode select) field from "closed_loop" to "supervisory". Sample record:

record(ao,"C1:SUS-ETMX_ULBiasAdj")
{
        field(DESC,"Bias Adjust for ETMX UL Coil Output")
        field(DTYP,"asynInt32")
        field(OUT, "@asynMask(C1AUXEX_XT1541A_DAC, 0, -16)MODBUS_DATA")
        field(SCAN,".1 second")
        field(OMSL,"supervisory")  <-- Used to be "closed_loop"
        field(DOL, "C1:SUS-ETMX_ULBiasSet  PP")
        field(PREC,"3")
        field(EGUF,"10.923")
        field(EGUL,"-10.923")
        field(EGU, "Volts")
        field(LINR,"LINEAR")
        field(DRVH,"10")
        field(DRVL,"-10")
        field(HOPR,"10")
        field(LOPR,"-10")
}

Now, on reboort/IOC re-initialization the physical DAC channels are performing a one-time readback of the last stored value in the Acromag's register, then idle until the last StartPost statement executes the script ETMXaux.sh, which changes their OMSL field back to "closed_loop". This causes them to start updating their output from the calc records defined in their DOL field (which have by then recovered their default values curtesy of burt). The result is a smooth transition from idling to the controlled state with no sudden or large offset changes. yes

  13580   Wed Jan 24 23:13:30 2018 johannesUpdateDAQc1auxex2 startup behavior
Quote:

The result is a smooth transition from idling to the controlled state with no sudden or large offset changes. yes

[Gautam, Johannes]

While checking how smooth the transition is we still noticed significant motion of ETMX by looking at the locked green laser and OpLevs. We found that this motion was not caused by interruption of the slow offset adjust, but rather the Watchdog being re-initialized to its OFF state, which cuts the fast channels OFF. On other optics this is observed too, but not as severe. The cause is a rather large offset on the LR coil coming from the fast DAQ, which was reported as 50mV by the slow readback channel (while other readback values are <10mV). It is present even when turning the output of the CDS model OFF, but vanishes when the watchdog is triggered. This helped us trace it to an offset of the DAC output itself: it is present at the output of the AI board but vanishes when the DAC is disconnected. The actual offset is ~40mV, as opposed to other channels on the same board, which ahve offsets in the range 3-7mV.

While we can compensate for this offset in software - it made us  wonder if the DAC channel is somehow busted and if that's what causing the 'wandering' of ETMX that we have been observing recently. There are two free DAC channels on the AI chassis that has the side coil and the green temperature control signals. We could re-route the LR signal through a different DAC channel to fix this.

gautam: 40mV offset at the AI board output gets multiplied by 3 in the dewhitening board, so there is a 120mV DC offset going to the coil (measured at dewhite board output with DMM). The offset itself isn't hurting us, but the fact that it is several times larger than other channels led us to wonder if it could be drifting around as well. From my SOS pitch balancing forays, in my head I have the number 30mrad as being the full range of the OSEM actuation - so if the offset swings by 120mV, that's ~150urad of motion, which is quite large, and is of the order of magnitude I'm used to seeing ETMX move around by.

  13590   Wed Jan 31 15:29:44 2018 johannesUpdateDAQPSL acromag server moved from megatron to c1auxex2

I moved the epics IOC server process for the single Acromag ADC that monitors the PSL signals from megatron to c1auxex2.

First, I disabled the legacy support on all channels as explained in elog 13565. Then I copied the files npro_config.cmd and NPRO.db from /opt/rtcds/caltech/c1/scripts/Acromag to /cvs/cds/caltech/target/c1psl2/ following the pattern of the old Motorola machines and the new c1auxex2. I had to make some edits for correct paths and expanded the epics records to the standard we're using for ETMX.

I then added a service to systemd on c1auxex2 that runs the epics IOC for the Acromag PSL channels: /etc/systemd/system/modbusPSL.service. No more tmux on megatron.

Running two IOCs on a signle machine at the same time did not produce any errors and seems fine so far.

  13647   Wed Feb 21 17:20:32 2018 johannesUpdateVACHornet gauge connected to DAQ.

I wired the six available BNC connectors on the front panel of the new XEND slow DAQ to physical Acromag channels. There were two unused ADC channels and eight DAC channels, of which I connected four. The following entries were added to /cvs/cds/caltech/target/c1auxex2/ETMXAUX2.db /caltech/target/c1auxex2/ETMXaux2.db

Connector Acromag Channel EPICS Name
In1 XT1221C #6 C1:Vac-CC1_HORNET_PRESSURE_VOLT
In2 XT1221C #7 C1:PEM-SEIS_XARM_TEMP_MON C1:PEM-SEIS_EX_TEMP_MON
Out1 XT1541B #4 C1:PEM-SEIS_XARM_TEMP_CTRL C1:PEM-SEIS_EX_TEMP_CTRL
Out2 XT1541B #5 Not Assigned
Out3 XT1541B #6 Not Assigned
Out4 XT1541B #7 Not Assigned

C1:Vac-CC1_HORNET_PRESSURE_VOLT is converted to the additional soft channel C1:Vac-CC1_HORNET_PRESSURE in units of torr using the conversion  10^{(\mathrm{Voltage}-10)} stated in the manual. A quick check showed that the resulting number and the displayed pressure on the vacuum gauge itself agree to ~1e-8 torr. Gautam added the new EPICS calc channel to the C0EDCU and restarted FB, now the data is being recorded.

Three of the output channels do not have a purpose yet, so their epics records were created but remain inactive for the time being.

Attachment 1: VacLog.png
VacLog.png
  13681   Tue Mar 13 20:03:16 2018 johannesConfigurationComputersc1auxex replacement

I assembled the rack-mount server that will long-term replace c1auxex, so we can return the borrowed unit to Larry.

SUPERMICRO SYS-5017A-EP Specs:

  • Intel Atom N2800 (2 cores, 1.8GHz, 1MB, 64-bit)
  • 4GB (2x2GB) DDR3 RAM
  • 128 GB SSD

IMG_20180313_105154890.jpg      IMG_20180313_133031002.jpg

I installed a standard Debian Jessie distribution, with option LXDE for minimal resource usage. Steps taken after fresh install

  1. Give controls sudo permission: usermod -aG sudo controls
  2. mkdir /cvs/cds
  3. apt-get install nfs-common
  4. Added line "chiara:/home/cds              /cvs/cds        nfs     rw,bg,nfsvers=3" to end of /etc/fstab
  5. Configured network adapter in /etc/network/interfaces
            iface eth0 inet static
            address 192.168.113.48
            netmask 255.255.255.0
            gateway 192.168.113.2
            dns-nameservers 192.168.113.104 131.215.125.1 131.215.139.100
            dns-search martian

    I first assigned the IP 192.168.113.59 of the original c1auxex, but for some reason my ssh connections kept failing mid-session. After I switched to a different IP the disruption no longer happened.
  6. Add lines "search martian" and "nameserver 192.168.113.104" to /etc/resolv.conf
  7. apt-get install openssh-server
    At this point the unit was ready for remote connections on the martian network, and I moved it to the XEND.
  8. Added lines to /home/controls/.bashrc to set paths and environment variables:
    export PATH=/cvs/cds/rtapps/epics-3.14.12.2_long/base/bin/linux-x86_64:/cvs/cds/rtapps/epics-3.14.12.2_long/extensions/bin/linux-x86_64:$PATH
    export HOST_ARCH=linux-x86_64
    export EPICS_HOST_ARCH=linux-x86_64
    export RPN_DEFNS=~/.defns.rpn
    export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/cvs/cds/rtapps/epics-3.14.12.2_long/base/lib/linux-x86_64:/cvs/cds/rtapps/epics-3.14.12.2_long/modules/modbus/lib/linux-x86_64/:/cvs/cds/rtapps/epics-3.14.12.2_long/modules/asyn/lib/linux-x86_64
  9. apt-get install libmotif-common libmotif4 libxp6 (required to run burtwb utility)

The server is ready to take over for c1auxex2 and does not need any local epics compiled, since it can run the 3.14.12.2_long binaries in /cvs/cds.

Attachment 1: IMG_20180313_105154890.jpg
IMG_20180313_105154890.jpg
Attachment 2: IMG_20180313_133031002.jpg
IMG_20180313_133031002.jpg
  13682   Wed Mar 14 23:58:30 2018 johannesConfigurationComputersc1auxex replacement

I replaced the borrowed server with the permanent one today. Before Removing the current server, Before, I performed several additional preparations:

  • Updated Chiara hostables to IP 192.168.113.48 for c1auxex
  • apt-get install procserv
  • copied ETMXaux2.* files in /cvs/cds/caltech/target/c1auxex2 to ETMXaux.* and changed references from /opt/rtcds/epics (which was a local directory on c1auxex2) to /cvs/cds/rtapps/epics-3.14.12.2_long in the copied files
  • Added instruction
    Environment="LD_LIBRARY_PATH=/cvs/cds/rtapps/epics-3.14.12.2_long/base/lib/linux-x86_64:/cvs/cds/rtapps/epics-3.14.12.2_long/modules/modbus/lib/linux-x86_64/:/cvs/cds/rtapps/epics-3.14.12.2_long/modules/asyn/lib/linux-x86_64"
    to /etc/systemd/system/modbusIOC.service  (required for burtwb dependencies)

Then I replaced the server:

  1. IFO was in LSC mode with both arms locked
  2. Backed up ETMX alignment using save feature in IFOalign screen
  3. Disengaged LSC mode
  4. Shut down ETMX watchdog
  5. Disconnected ETMX satellite box
  6. Shut down c1auxex2 and c1auxex
  7. Performed the server swap
  8. Booted c1auxex
  9. Made sure EPICS channels were back online and channel defaults were restored
  10. Reconnected satellite box
  11. Turned on watchdog
  12. Turned on OpLevs
  13. Engaged LSC mode -> both arms were instantly locked

I returned c1auxex2 to Larry, who needed it back asap because of some hardware failure

Steve: Acromag XT1221 ordered 3-15-18

  13687   Mon Mar 19 14:39:09 2018 johannesConfigurationComputersc1auxex replacement

[gautam, johannes]

The temperature control output channel for the XEND seismometer wasn't working properly. The EPICS channel existed, could be written to and read from, but no physical voltage was observed on the (confirmed properly) wired connector.

The Acromag DAC that outputs this channel was completely spare in the original scheme and does not serve any other channels at the moment. We found it to be unresponsive to ping from the host machine (reminder: the Acromags are on their own subnet with IPs 192.168.114.xxx connected to the secondary ethernet adapter of c1auxex), while all others returned the ping just fine. The modules have daisy-chained ethernet connections, and the one Acromag unit behind the unresponsive one in the chain was still responding to ping and its channels were working, so it couldn't have been a problem with the (ethernet) cabling.

Gautam and I power-cycled the chassis and server, which resolved the issue. The channel is now outputting the requested voltage on the Out1 BNC connector of the chassis (front). When I was setting up the whole system and did frequent rebooting and IP-redefinitions I have seen network issues arise between server and Acromags. In particular, when changing the network settings server-side, the Acromags needed to reboot occasionally. So this whole problem was probably due to the recent server-swap, as the chassis had not been power-cycled since.

 

During the debugging we also found that the c1psl2 channels were not working. This was because I had overlooked to update the epics environment variables for the modbus path defined in /cvs/cds/caltech/target/c1psl2/npro_config.cmd from the local installation /opt/epics/ (which doesn't exist on the new server anymore) to the network location /cvs/cds/rtapps/epics-3.14.12.2_long/. This has been fixed and the slow diagnostic PSL channels are recording again.

  13742   Mon Apr 9 23:28:49 2018 johannesConfigurationDAQc1psl channel list

I made a list of all the physical c1psl channels to get a better idea for how many acromags we need to replace it eventually. There  3123 unit is the one whose failure had prevented c1psl from booting, which is why it was unplugged (elog post 12852), and its channels have been inactive since. Are the 126MOPA channels used for the current mephisto? 126 tells me it's for an old lightwave laser, but I was checking a few and found that they have non-zero, changing values, so they may have been rewired.

It also hosts some virtual channels for the ISS with root C1:PSL-ISS_ defined in iss.db and dc.db, the PSL particle counter with root C1:PEM- defined in PCount.db  and a whole lot of PSL status channels defined in pslstatus.db. Transfering these virtual channels to a different machine is almost trivial, but the serial readout of the particle counter would have to find a new home.

Long story short - we need:

Function Type # Channels #Channels (no MOPA) # Units # Units (no MOPA)
ADC XT1221 34 21 5 3
DAC XT1541 17 14 3 2
BIO XT1111 19 10 2 1

 



3113 - ADC

C1:PSL-126MOPA_126PWR
C1:PSL-126MOPA_DTMP
C1:PSL-126MOPA_LTMP
C1:PSL-126MOPA_DMON
C1:PSL-126MOPA_LMON
C1:PSL-126MOPA_CURMON
C1:PSL-126MOPA_DTEC
C1:PSL-126MOPA_LTEC
C1:PSL-126MOPA_CURMON2
C1:PSL-126MOPA_HTEMP
C1:PSL-126MOPA_HTEMPSET
C1:PSL-FSS_RFPDDC
C1:PSL-FSS_LODET
C1:PSL-FSS_FAST
C1:PSL-FSS_PCDRIVE
C1:PSL-FSS_MODET
C1:PSL-FSS_VCODETPWR
C1:PSL-FSS_TIDALOUT
C1:PSL-PMC_RFPDDC
C1:PSL-PMC_LODET
C1:PSL-PMC_PZT
C1:PSL-PMC_MODET


3123 - ADC (failed)

C1:PSL-126MOPA_AMPMON
C1:PSL-126MOPA_126MON
C1:PSL-FSS_RCTRANSPD
C1:PSL-FSS_MINCOMEAS
C1:PSL-FSS_RMTEMP
C1:PSL-FSS_RCTEMP
C1:PSL-FSS_MIXERM
C1:PSL-FSS_SLOWM
C1:PSL-FSS_TIDALINPUT
C1:PSL-PMC_PMCTRANSPD
C1:PSL-PMC_PMCERR
C1:PSL-PPKTP_TEMP


4116 - DAC

C1:PSL-126MOPA_126CURADJ
C1:PSL-126MOPA_DCAMP
C1:PSL-126MOPA_DCAMP-
C1:PSL-FSS_INOFFSET
C1:PSL-FSS_MGAIN
C1:PSL-FSS_FASTGAIN
C1:PSL-FSS_PHCON
C1:PSL-FSS_RFADJ
C1:PSL-FSS_SLOWDC
C1:PSL-FSS_VCOMODLEVEL
C1:PSL-FSS_TIDAL
C1:PSL-FSS_TIDALSET
C1:PSL-PMC_GAIN
C1:PSL-PMC_INOFFSET
C1:PSL-PMC_PHCON
C1:PSL-PMC_RFADJ
C1:PSL-PMC_RAMP


XVME-210 - Binary Input

C1:PSL-126MOPA_FAULT
C1:PSL-126MOPA_INTERLOCK
C1:PSL-126MOPA_SHUTTER
C1:PSL-126MOPA_126LASE
C1:PSL-126MOPA_AMPON


XVME-220 - Binary Output

C1:PSL-126MOPA_126NE
C1:PSL-126MOPA_126STANDBY
C1:PSL-126MOPA_SHUTOPENEX
C1:PSL-126MOPA_STANDBY
C1:PSL-FSS_SW1
C1:PSL-FSS_SW2
C1:PSL-FSS_FASTSWEEP
C1:PSL-FSS_PHFLIP
C1:PSL-FSS_VCOTESTSW
C1:PSL-FSS_VCOWIDESW
C1:PSL-PMC_SW1
C1:PSL-PMC_SW2
C1:PSL-PMC_PHFLIP
C1:PSL-PMC_BLANK

  13764   Wed Apr 18 22:46:23 2018 johannesConfigurationGeneralAS port laser injection

Using Gautam's Finesse file and the cad files for the 40m optical setup I propagated the arm mode out of the AS port. For the location of the 3.04 mm waist I used the average distance to the ITMs, which is 11.321 m from the beam spot on the 2 inch mirror on the AS table close to the viewport. The 2inch lens focuses the IFO mode to a 82.6 μm waist at a distance of 81 cm, which is what we have to match the aux laser fiber output to.

I profiled the fiber output and obtained a waist of 289.4 μm at a distance of 93.3 cm from the front edge of the base of the fiber mount. Next step is to figure out the lens placement and how to merge the beam paths. We could use a simple mirror if we don't need AS110 and AS55, we could use a polarizing BS and work with s polarization, or we find a Faraday Isolator.


While doing a beam scan with the razor blade method I noticed that the aux laser has significant intensity noise. This is seen on the New Focus 1611 that is used for the beat signal between PSL and aux laser, as well as on the fiber output PD. There is a strong oscillation around 210 kHz. The oscillation frequency decreases when the output power is turned down, the noise eater has no effect. Koji suggested it could be light scattering back into the laser because I couldn't find a usable Faraday Isolator back when I installed the aux laser in the PSL enclosure. I'll have to investigate this a little further, look at the spectrum, etc. This intensity noise will appear as amplitude noise of the beat note, which worries me a little.

power_out_fluctuation_DC.png      power_out_fluctuation_AC_zoom.png

Attachment 1: ASpath.svg.png
ASpath.svg.png
  13781   Tue Apr 24 08:36:47 2018 johannesConfigurationGeneralAux Laser LD dying? (AS port laser injection)

In September 2017 I measured ~150mW output power, which was already kind of low. What are the chances of getting this one repaired? Steve, can you please check the serial number? It's probably too old like the other ones.

Quote:

I suspect that the LD of the aux laser is dying.
- The max power we obtain from this laser (700mW NPRO) is 33mW. Yes, 33mW. (See attachment 1)

 

  13810   Thu May 3 10:40:43 2018 johannesConfigurationGeneralAS port laser injection

Instead of trying to couple the fiber output into the interferometer, I'm doing the reverse and maximize the amount of interferometer light going into the fiber. I set up the mode-matching solution shown in attachment #1 and started tweaking the lens positions. Attachment #2 shows the setup on the AS table. After the initial placement I kept moving the lenses in the green arrow directions and got more and more light into the fiber.

When I stopped this work yesterday I measured 86% of the AS port light coming out the other fiber end, and I have not yet reached a turning point with moving the lenses, so it's possible I can tickle out a little more than that.

It occured to me though that I may have been a little hasty with the placement of the mirror that in attachment #2 redirects the beam which would ordinarily go to AS55. For my arm ringdown measurements this doesn't matter, I could actually place it even before the 50/50 beamsplitter that sends light onto AS110 and double the amount of light going into the IFO. What signals are needed for the Guoy phase measurement? Is AS 110 sufficient, or do we need AS55?

Attachment 1: mm_solution_AStable.png
mm_solution_AStable.png
Attachment 2: AStable_beampath.pdf
AStable_beampath.pdf
  13832   Fri May 11 11:47:33 2018 johannesSummaryPEMAcromag issues

The replacement Acromag we scooped from the West Bridge E-Shop does actually seem to work, although we thought it was broken - at first it was just outputting zeros, but after I did the calibration procedure, applying +10 V and -10 V, respectively, it was reporting voltage correctly, over the full range. I don't know why the factory settings would be messed up, but it had been out of the box before. I did this only with channel 7, so you need to calibrate channels 0-6 and confirm that they indeed also work properly.

  13839   Sun May 13 20:48:38 2018 johannesUpdateGeneralCDS crash

I think the root of the problem is that the /opt/rtapps/ and /cvs/cds/rtapps/ mounting locations point to the same directory on the nfs server. Gautam and I were cleaning up the /cvs/cds/caltech/target/ directory, placing the previous contents of /cvs/cds/caltech/target/c1auxex/, including database files and startup instructions in /cvs/cds/caltech/target/c1auxex_oldVME/, and then moved /cvs/cds/caltech/target/c1auxex2/, which has the channel database and initialization files for the Acromac DAQ, to /cvs/cds/caltech/target/c1auxex/.

This also required updating the systemd entries on c1auxex to point to the changed directory. While confirming that everything worked as before we noticed that upon startup the EPICS IOC complains about not being able to find the caRepeater binary. This was not new and has not limited DAQ functionality in the past, but we wanted to fix this, as it seemed to be some simple PATH issue. While the paths are all correctly defined in the user login shell, systemd runs on a lower level and doesn't know about them. One thing we tried was to let systemd execute /cvs/cds/rtapps/epics-3.14.12.2_long/etc/epics-user-env.sh initializing EPICS. It was strange that the content of that file was pointing to /opt/rtapps/epics-3.14.12.2_long/base, which is not mounted on the slow machines, so we changed the /opt/ it to /cvs/cds/, not realizing that the frontends read from the same directory (as Gautam said, /cvs/cds does not exist as a mount point on the frontend). It ended up not working this way, and apparently I forgot to change it back during clean up. But worse, never elogged it!

In the end, we managed to to give systemd the correct path definitions by explicitly calling them out in /cvs/cds/caltech/target/c1auxex/ETMXenv, to which a reference was added in the systemd service file. The caRepeater warning no longer appears.

  13881   Wed May 23 00:45:18 2018 johannesConfigurationGeneralAS port laser injection

I was planning to set up the additions to the AS table that are outlined in Attachment #1. Unfortunately the beam is too large for the 2mm clear aperture Faraday rotators that we have available at that position. I checked the 40m and QIL and found 5 Faraday isolators/rotators for 1064 nm total, but none have large enough aperture for the current setup. Some options for buying a larger aperture isolator are:

I wanted to leave the rest of the setup undisturbed at first, but I think a much easier solution would be to move the 2" focusing lens up by about 12", which moves the beam focus away from AS55 to where the Faraday will be placed, but we can re-focus it with another lens. I may have to change the mode-matching for the aux laser fiber slightly to accomodate this change, but if there are no other concerns I would like to start this work tomorrow (Wednesday).

Attachment 1: faraday_location.pdf
faraday_location.pdf
  13900   Thu May 31 02:04:55 2018 johannesUpdatePSLAUX laser state of mind

The AUX laser is down to 5.4 mW output power sad

What's worse, because we wanted those fast switching times by the AOM for ringdowns, I made the beam really small, which

  1. came with a severe tradeoff against conversion efficiency. I tried to squeeze the last out of it today, but there's only about 1.3 mW of diffracted light in the first order that reaches the fiber, with higher diffraction orders already visible.
  2. produced a very elliptical mode which was difficult to match into the fiber. Gautam and I measured 600 uW coming out of the fiber on the AS table. This per se is enough for the SRC spectroscopy demonstration, but with the current setup of the drive electronics there's no amplitude modulation of the deflected beam.

When going though the labs with Koji last week I discovered a stash of modulators in the Crackle lab. Among them there's an 80 MHz AOM with compact driver that had a modulation bandwidth of 30MHz. The fall time with this one should be around 100ns, and since the arm cavities have linewidths of ~10kHz their ringdown times are a few microseconds, so that would be sufficient. I suggest we swap this or a similar one in for the current one, make the beam larger, and redo the fiber modematching. That way we may get ~3mW onto the AS table.

I think I want to use AS110 for the ringdowns, so in the next couple days I'll look into its noise to get a better idea about what power we need for the arm ringdowns.

Attachment 1: IMG_20180530_220058190.jpg
IMG_20180530_220058190.jpg
  13911   Sun Jun 3 22:48:59 2018 johannesUpdatePSLaux laser replacement

I brought the NPRO from the Crackle experiment over to the 40m Lab and set it up on the PSL table to replace the slowly dying AUX laser. I also brought along a Faraday isolator, broadband EOM, and an ISOMET AOM with driver electronics from the optics storage in the Crackle Lab.

This laser is a much newer model, made in 2008, and still has all its mojo, but we should probably keep up the practice of turning it off when it's not going to be used for a while. I measured 320 mW leaving the laser, and 299mW of that going through the Faraday isolator, whose Brewster-angle polarizer I had to clean because they were a little dusty. While the laser output is going strong, the controller displays a power output of only 10 mW, which makes me think that the power monitoring PD is busted. This is a completely different failure mode from what we've seen with the other NPROs that we can hopefully get repaired at some point, particularly because the laser is newer, but for now it's installed on the PSL table. This likely means that the noise eater isn't working on this unit either, for different reasons, but at least we have plenty of optical power.

The setup is very similar to before, with the addition of a Faraday isolator and a broadband EOM, in case we decide to get more bandwidth in the PLL. I changed the Crystal Technologies 3200-113 200 MHz AOM for an ISOMET 80 MHz AOM with RF driver from the Crackle lab's optics storage and sized the AUX beam to a diameter of 200 micron. I couldn't locate an appropriate heat sink for the driver, which is still in factory condiction, but since the PSL AOM also runs on 80MHz I used that one instead. The two AOMs saturate at different RF powers, so care must be taken to not drive the AUX AOM too high. At 600 mV input to the driver the deflection into the first order was maximal at 73 % of the input power, with the second order beam and the first order on the other side cleary visible.

In order to speed things up I didn't spend too much time on mode-matching, but the advantage of the fiber setup is that we can always improve later if need be without affecting things downstream. I coupled the first order beam into the fiber to the AS table with 58% efficiency, and restored the beat with the PSL laser on the NewFocus 1611. The contrast there is only about 20%, netting a -20 dBm beat note. This is only a marginal improvement from before, so the PLL will work as usual, but if we get the visibility up a little in the future we won't need to amplify the PD signal for the PLL anymore.

Some more things I wanted to do but didn't get to today are

  • Measure intensity noise of aux laser
  • Measure rise and fall times of new AOM
  • Get PLL back up and running
  • Place 90/10 beamsplitter in AS path and couple IFO output into fiber (= couple fiber output into IFO)

I'll resume this work tomorrow. I turned the aux laser and the AOM driver input off. For the PSL beat the AOM drive is not needed, and the power in the optical fiber should not exceed 100 mW, so the offset voltage to the AOM RF driver has to remain below 300 mV.

  13912   Mon Jun 4 02:52:52 2018 johannesUpdatePSLaux laser replacement

> While the laser output is going strong, the controller displays a power output of only 10 mW, which makes me think that the power monitoring PD is busted.

NPRO internal power monitor often shows smaller value than the actual due to a broken PD or misalignment. I don't think we need to fix it.

STEVE: Aux Lightwave M126-1064-200, sn259 [July 2009] 1.76A, ADJ 9,  9mW on it's display should not mislead you. It's output  320mW

Quote:

I brought the NPRO from the Crackle experiment over to the 40m Lab and set it up on the PSL table to replace the slowly dying AUX laser. I also brought along a Faraday isolator, broadband EOM, and an ISOMET AOM with driver electronics from the optics storage in the Crackle Lab.

This laser is a much newer model, made in 2008, and still has all its mojo, but we should probably keep up the practice of turning it off when it's not going to be used for a while. I measured 320 mW leaving the laser, and 299mW of that going through the Faraday isolator, whose Brewster-angle polarizer I had to clean because they were a little dusty. While the laser output is going strong, the controller displays a power output of only 10 mW, which makes me think that the power monitoring PD is busted. This is a completely different failure mode from what we've seen with the other NPROs that we can hopefully get repaired at some point, particularly because the laser is newer, but for now it's installed on the PSL table. This likely means that the noise eater isn't working on this unit either, for different reasons, but at least we have plenty of optical power.

The setup is very similar to before, with the addition of a Faraday isolator and a broadband EOM, in case we decide to get more bandwidth in the PLL. I changed the Crystal Technologies 3200-113 200 MHz AOM for an ISOMET 80 MHz AOM with RF driver from the Crackle lab's optics storage and sized the AUX beam to a diameter of 200 micron. I couldn't locate an appropriate heat sink for the driver, which is still in factory condiction, but since the PSL AOM also runs on 80MHz I used that one instead. The two AOMs saturate at different RF powers, so care must be taken to not drive the AUX AOM too high. At 600 mV input to the driver the deflection into the first order was maximal at 73 % of the input power, with the second order beam and the first order on the other side cleary visible.

In order to speed things up I didn't spend too much time on mode-matching, but the advantage of the fiber setup is that we can always improve later if need be without affecting things downstream. I coupled the first order beam into the fiber to the AS table with 58% efficiency, and restored the beat with the PSL laser on the NewFocus 1611. The contrast there is only about 20%, netting a -20 dBm beat note. This is only a marginal improvement from before, so the PLL will work as usual, but if we get the visibility up a little in the future we won't need to amplify the PD signal for the PLL anymore.

Some more things I wanted to do but didn't get to today are

  • Measure intensity noise of aux laser
  • Measure rise and fall times of new AOM
  • Get PLL back up and running
  • Place 90/10 beamsplitter in AS path and couple IFO output into fiber (= couple fiber output into IFO)

I'll resume this work tomorrow. I turned the aux laser and the AOM driver input off. For the PSL beat the AOM drive is not needed, and the power in the optical fiber should not exceed 100 mW, so the offset voltage to the AOM RF driver has to remain below 300 mV.

 

  13932   Fri Jun 8 01:08:22 2018 johannesUpdatePSLFirst light of AUX at YEND

Among the things that we hadn't taken care of yesterday before beginning to look for transmission signals were the polarization of the AUX beam on the AS table and optimizing the PLL feedback. The AUX beam is s-polarized on the PSL table (choice due to availablility of mirrors), and I added a half waveplate in front of the fiber to match it's axes. I placed another half-waveplate at the fiber output and send the reflection port of a PBS cube onto a PDA1CS photodetector. By alternatingly turning the waveplates I minimized the reflected light, giving strongly p-polarized light on the AS table for best results when interfering with the IFO beam. I wiggled the fiber and found no strong dependency of the output polarization on fiber bending. Attachment 2 shows the current layout.

The beat signal between AUX and PSL table is at -20dBm, and I adjusted the PLL gain and PI-corner to get reliable locking behavior. I think it's a good idea to keep the AUX beam on the AS table blocked while it's not in use, and only unblock it when it is phaselocked to avoid a rogue beam with no fixed phase relation to the PSL in the IFO.I blocked the beam after completing this work today.

I used the signal chain that Keerthana, Koji, and I set up yesterday to look for mode flashed of the AUX light in the YARM using the RF beat with the PSL carrier in transmission. To align the AUX beam to the arm the following steps were performed:

  1. Using a spectrum analyzer to look at the RF power at the target frequency between frequency-shifted AUX beam and PSL carrier on AS110, align the beam using the mirror pair closest to the fiber coupler for maximum signal.
  2. Initiate a sweep of the PLL LO frequency sourced by the Marconi using GPIB scripts over about 1 FSR. A strong peak was visible at ~31.76 MHz offset frequency
  3. Tune and hold LO frequency (in this case at 48.2526 MHz) such that AUX beam resonates in the arm. Optimize alignment by maximizing RF signal on PD in transmission.

This was followed by a sweep over two full FSRs. Attachment #1 shows the trace recorded by the AG4395 using the max data hold setting during the sweep. Essentially the beat between AUX and PSL carrier traced out the arm's transmission curve. At minimum transmission there was still a ~82dB beat on the transmission PD visible.

The YEND QPD is currently blocked and sees no light.

Attachment 1: AG4395A_07-06-2018_205019.pdf
AG4395A_07-06-2018_205019.pdf
Attachment 2: PSL_AUX_SETUP.pdf
PSL_AUX_SETUP.pdf
Attachment 3: AS_AUX_SETUP.pdf
AS_AUX_SETUP.pdf
  13958   Wed Jun 13 23:23:44 2018 johannesUpdateCDSEX wiring confusion

It's true.

I went through the wiring of the c1auxex crate today to disentangle the pin assignments. The full detail can be found in attachment #1, #2 has less detail but is more eye candy. The red flagged channels are now marked for removal at the next opportunity. This will free up DAQ channels as follows:

TYPE Total Available now Available after
ADC 24 2 14
DAC 16 8 12
BIO sinking 16 7 7
BIO sourcing 8 8 8

This should be enough for temperature sensing, NPRO diagnostics, and even eventual remote PDH control with new servo boxes.

Attachment 1: c1auxex_channels.pdf
c1auxex_channels.pdf
Attachment 2: XEND_slow_wiring.pdf
XEND_slow_wiring.pdf
  13965   Thu Jun 14 15:31:18 2018 johannesUpdateCDSEX wiring confusion

Bad wording, sorry. Should have been channels in excess of ETMX controls. I'll add the others to the list as well.

Updated channel list and wiring diagram attached. Labels are 'F' for 'Front' and 'R' for - you guessed it - 'Rear', the number identifies the slot panel the breakout is attached to.

Attachment 1: XEND_slow_wiring.pdf
XEND_slow_wiring.pdf
Attachment 2: c1auxex_channels.pdf
c1auxex_channels.pdf
  13968   Thu Jun 14 22:45:05 2018 johannesUpdateGeneralAUX beam SRC alignment

[Jon, Gautam, Johannes]

Jon spent some time trying to align the AUX beam to the SRC today, I got to the game kind of late so maybe others can add more detail.

The AUX beam that is reflected by the SRM looks terribly misshapen - it is quite elongated in vertical direction. Unfortunately I didn't snap a picture of it - anybody? It seemed at first as if this could be clipping - but after confirming the alignment of the AUX beam with the PSL output beam with aligned SRM, a slow dither of the SRM just moved the ugly pattern on the AS camera with no change to its shape - so clipping is unlikely. I'm now thinking that this is just the output beam of the fiber coupler after propagating ~15 meters to the SRM and back - even though this aspheric lens triplet coupler is supposed to be super-duper. I found that if I loosen the fiber slightly and pull it back just a bit at least the spot on the AS camera becomes nice and round - so maybe the fiber just doesn't sit well in this collimator? Not sure why that would be. I checked the fiber tip with the microscope, and while there was some gunk present, the central region and the core were clear (still cleaned using the fiber cleaning kit, which got rid of the debris). Either way, before switching to a different collimator I think we should give the Guoy phase measurement a shot - after all there was plenty of RF signal present on both AS110 and the PDA10CF placed at the YEND.

Looking for rogue beams on the AS table, I started placing some beam dumps. There was one particularly strong source of stray beams - a lens that was labeled with KPX094AR.33_F100. It became apparent after alignment efforts to the IFO had moved the AUX beam signifcantly off-center on this lens. According to the label it should have an AR coating for 1064nm, however judging by the amount of reflected light, it was certainly NOT AR-coated for 1064nm. I replaced it with a bi-convex f=100mm lens with confirmed AR-behavior.

The AUX laser is currently shuttered.


Per our Wednesday meeting, some items to work on are

  • Align the zero-order AUX beam into a second collimator on the PSL table, so we can switch the fiber output and look for RF signals at the offset-phaselock frequency without the additional frequency shift from the AOM. This will simpligy the mode spectroscopy scheme significantly
  • Abandon the R10/T90 beamsplitters in favor of R90/T10 beamsplitters. We'll swap the large mirror in front of the AS camera with an R90/T10 BS, and follow it up with a second R90/T10 BS that sends the AUX beam to the IFO. This way we'll have identical power levels on AS110 and AS55, and still 90% of the current AUX light going into the IFO, but without strong secondary beams from R10/T90 optics.
  13978   Mon Jun 18 10:34:45 2018 johannesUpdateComputer Scripts / Programsrunning comsol job on optimus

I'm running a comsol job on optimus in a tmux session named cryocavs. Should be done in less than 24 hours, judging by past durations.

  13982   Mon Jun 18 15:59:17 2018 johannesUpdatePSLOptics on AS table
Quote:

Furthermore, I believe we are losing more than 10% of the light due to this BS. The ASDC (which is derived from AS55 PD) level is down at ~110cts as the Michelson is fringing, while it used to be ~200 cts. I will update with a power measurement shortly. But I think we should move ahead with the plan to combine the beam into the IFO's AS mode as discussed at the meeting last week.

Is the 10% specified for P-Pol or for UNP? I contacted CVI about beamsplitters, since their website doesn't list a BS1-1064-90-... option on the website. They say a R=90% beamsplitter would be a custom job. The closest stock item they got is BS1-1064-95-2025-45UNP specified at R=95% for UNPolarized beams. They were kind enough to sent me the measured transmission curves for a recent lot of these, which is attached was uploaded to the wiki [Elog Police K: NO PROPRIETARY DOCUMENTS ON THE ELOG, which is public. Put it on our wiki and put the link here]. The figure is not labeled, but according to the contact Red is S-Pol and Blue is P-Pol, which means that this one actually has R=~90% for P, pretty much what we want. We'll need to buy two of these to make the swap in the setup.

Back to your original point: There's only a BS1-1064-10-2025-45UNP on the website, so unless we got these as custom items, the R for P-Pol is probably NOT actually 10%, just somewhere between 0% and 20%

  13989   Wed Jun 20 00:57:04 2018 johannesUpdateGeneralAUX beam alignment issues

We did swap a lens as discussed in elog 13968, but they both had f=100mm specified, the difference being one was AR-coated for 1064 and bi-convex, while the other one was plano-convex and had a different coating. The reason for the large beam spot was something else: The fiber wasn't sitting in the coupler properly. When reconnecting the fiber after taking it out make sure to align the key on the fiber end with the notch in the coupler before tightening. After discovering this the following was done:

  • Fixed fiber mounting situation
  • Tested AUX alignment into fiber on PSL table, was still good
  • The AUX polarization was aligned to the wrong fiber axis. I fixed this. The coupler on the PSL table has it's noth oriented vertically since we're using s-polarized light. The AS-table coupler is rotated by 90 degrees, such that the notch points to the side. This way we technically don't need any halfwaveplates for rotation. However, there are still current HWPs installed.
  • Locked both arms and ran dither alignment until satisfactory
  • Misaligned ITMX and ETMX, and further set the ITMX pitch offset to 0.0
  • Started overlapping the expectedly misaligned beams by eye. For this I turned the power of the deflected beam down to 50mV bias voltage, which gives the PSL and AUX lasers similar card-brightness on the shared path
  • Misaligned SRM more because there was still the strong prompt reflection coming out the AS port.
  • Restored phaselock between AUX and PSL, with beat at 30MHz between 1st-order diffracted in fiber and PSL
  • Immediately saw STRONG 30MHz RF signal on AG4395. Disappeared when blocking AUX, and optimized alignment brought the signal up to -10dBm, as shown in attachment #1
  • Checked YEND PDA10CF and saw a -80dBm RF signal at 30 MHz (#2), compatible with earlier observations.

Before leaving I restored the XARM alignment. SRM remains misaligned, LSC off. Alignment shouldn't change drastically over night, so I suggest when picking this work up tomorrow to directly look for the beats after phaselocking AUX and PSL

Attachment 1: as110_rf_30MHz.pdf
as110_rf_30MHz.pdf
Attachment 2: yend_rf_30MHz.pdf
yend_rf_30MHz.pdf
  14013   Sun Jun 24 23:13:46 2018 johannesUpdateGeneralAUX beam alignment issues

At some point we want to change the AUX injection on the AS table to interfere less with the normal interferometer path, and avoid 10/90 beamsplitters which produce a fair amount of ghosting. The plan is to replace the 99/1 BS whose reflection goes to AS110 and AS55, while the transmission goes to the AS camera, with a 90/10 BS as shown in the attachment. This results in ~10% less light on the PDs compared to the pre-AUX era. Between this BS and the AS camera there will be a second 90/10 BS that sends the AUX light into the IFO, so we end up with marginally less AUX power into the IFO and the same PSL power on the AS cam. We're short optics, so this has to wait until two new beamsplitters arrive from CVI.

Attachment 1: AS_AUX_SETUP.pdf
AS_AUX_SETUP.pdf
  14170   Mon Aug 20 14:04:53 2018 johannesBureaucracyEquipment loanTwo C30642G PDs removed

EDIT: After discussing with Koji and checking the existing M2ISS PDs I put the two C30642G back and took two C30665GH (active diameter: 3mm) diodes. Only one of this type remains in storage.

I removed two C30642G photodiodes from the stash for the new M2ISS hardware and updated the wiki page accordingly.

  14172   Tue Aug 21 03:09:59 2018 johannesOmnistructureDAQPanels for Acromag DAQ chassis

I expanded the previous panels to 6U height for the new DAQ chassis we're buying for the upgrade. I figure it's best if we stick to the modular design, so I'm showing a panel for 8 BNC connectors as an example. The front panel has 12 slots, the back has 10 plus power connectors, switches, and the ethernet plug.

I moved the power switch to the rear because it's a waste of space to put it in the front, and it's not like we're power cycling this thing all the time. Note that the unit only requires +24V (for general operation, +20V also does the trick, as is the situation for ETMX) and +15V (excitation field for the binary I/O modules). While these could fit into a single CONEC power connector, it's probably for the better if we don't make a version that supplies a large positive voltage where negative is expected, so I put in two CONEC plugs for +/- 15 and +/- 24.

I want to order 5-6 of these as soon as possible, so if anyone wants anything changed or sees a problem, please do tell!

Attachment 1: auxdaq_40m_6U_front.pdf
auxdaq_40m_6U_front.pdf
Attachment 2: auxdaq_40m_6U_rear.pdf
auxdaq_40m_6U_rear.pdf
Attachment 3: auxdaq_40m_6U_BNC.pdf
auxdaq_40m_6U_BNC.pdf
  245   Thu Jan 17 15:11:13 2008 josephbUpdateCamerasWorking on Malfalda
1) I can statically compile the ListCamera code (which basically just goes out and finds what cameras are connected to the network) on Malfalda and use that compiled code to run on Linux2 without a problem. Simply needed to add explicit links to libpthread.a and librt.a.
(i.e. -Bstatic -L /usr/lib/ -lpthread -Bstatic -L /usr/lib -lrt)

With appropriate static libraries, it should be possible to port this code to other linux machines even if we can't get it to compile on the target machine itself.

2)I've modified the Snap.cpp file so that it uses a packet size of 1000 or less. This simply involves setting the "PacketSize" attribute with the built in functions they provide in their library. After un-commenting some lines in that code, I was able to save tiff type images from the camera of up to 400x240 pixels on Malfalda. The claimed maximum resolution for the camera is 752x480, but it doesn't seem to work with the current setup. The max number of pixels seems to about 100 times the packet size. I.e. packet size of 1000 will allow up to 400x240 (96000) but not 500x240 (120,000). Not sure if this is an issue just with snap code or the general libraries used.

3)Will be working towards getting video running over the next day or so.
  266   Fri Jan 25 11:38:16 2008 josephbConfigurationCamerasWorking GiGE video on Linux - sort of
1)I have been able to compile the SampleViewer program which can stream the video from the Prosilica 750C camera. This was accomplished on my 64-bit laptop running Ubuntu, after about 3 hours of explicitly converting strings to wxStrings and back again within the C++ code. (There was probably an easier way to simply overload the functions that were being called, but I wasn't sure how to go about doing so). By connecting it to the CDS network, I was able to immediately detect the camera and display the images.

Unfortunately, I have not yet been able to get it to compile on Mafalda with the x86 architecture. This may be do the fact that it has wxWidgets version 2.8.7 while my laptop has 2.8.4. Certainly the failure at compile time looks different from the errors earlier, and seem to be within the wxWidget code rather than the SampleViewer code. I may simply need to uninstall 2.8.7 and install 2.8.4 of wxWidgets.

The modified code that will compile on my machine has been copied to /cvs/cds/caltech/target/Prosilica/examples/SampleViewer2b.

2)The Snap program (under /cvs/cds/caltech/target/Prosilica/examples/Snap) also will now take full resolution images even on Mafalda. This was achieved by reducing the packet size to 1000 and also increasing the wait until timeout time up to 400 ms, which originally was at 100. Apparently, it takes on the order of 1 ms per packet as far as I can tell. So full resolution at 752x480 required something of order 360 packets.

To Do:
1) Get sample viewer to compile on Mafalda, and then statically compile it so it can be run from any Linux based machine.
2) Get a user friendly version of Snap up and running, statically compiled, with options for a continuous loop every X seconds and also to set desired parameters (such as height, width, file name to save to, save format, etc).
3) Figure out data analysis with the images in Matlab and an after the fact image viewer.

Attached is an example .tiff image from the Snap program.
Attachment 1: snap.tiff
  267   Fri Jan 25 13:36:13 2008 josephbConfigurationCamerasWorking GiGE video on Mafalda
Finally got the GiGE camera sample viewer video running on Mafalda by updating to the latest API (version 1.16 from Dec 16, 2007) from Prosilica and then using the modified Sample Viewer code I had written. The API version previously in cvs was 1.14.

It can currently be run by ssh -X into Mafalda and going to /cvs/cds/caltech/target/Prosilica/bin-pc/x86 and running the SampleViewer executable found there.
  289   Thu Jan 31 16:53:41 2008 josephbConfigurationCamerasImproving camera user interface
There's a new and improved version of Snap program at the moment people are free to play with.

Located in /cvs/cds/caltech/target/Prosilica/40mCode/

The program Snap now has a -h or --help option which describes some basic command line arguments. The height (in pixels), width (in pixels), exposure time (in micro seconds), file name to be saved to (in .tiff format), and packet size can all be set. The format type (i.e. pixel format such as Mono8 or Mono16) doesn't work at the moment.

At the moment, it only runs on mafalda.

Currently in the process of adding a loop option which will take images every X seconds, saving them to a given file name and then appending the time of capture to the file name.

After that need to add the ability to identify and choose the camera you want (as opposed to the first one it finds).

Lastly, I've been finding on occassion that the frame fails to save. However if you try again a few seconds later with the exact same parameters, it generally does save the second time. Not sure whats causing this, whether on the camera or network side of things.

I've attached two images, the first at default exposure time (15,000 microseconds) and the second at 1/5th that time (3,000 microseconds).
The command line used was "./Snap -E 3000 -F 'Camera_exp_3000.tiff' "
Attachment 1: Camera_exp_15000.tiff
Attachment 2: Camera_exp_3000.tiff
  292   Fri Feb 1 15:04:54 2008 josephbConfigurationCamerasSnap with looping functionality available
New GiGE camera code is available in /cvs/cds/caltech/target/Prosilica/40mCode/. Currently only runs on Mafalda.

Snap has expanded functionality to continuously loop infinitely or for a maximum number of images set by the user. File names generated with the loop option have the current Unix time and .tiff appended to them. So -f './test' will produce tiff files with format "test1234567.tiff". The -l option sets the number of seconds between images.

"./Snap -l 5 -i -f './test' " will cause the program to infinitely loop, saving images every 5 seconds. Using "-m 10" instead of "-i" will take a series of 10 images every 5 seconds (so taking a total of 50 seconds to run).

It also now defaults to 16-bit (in reality only 10 bit) output instead of 8 bit output. You can select between the two with -F 'Mono8' or -F 'Mono16'.

Use --help for a full list of options.

Note that if you ctrl-c out of the loop, you may need to run ./ResetCamera 131.215.113.104 (or whatever the IP is - use ./ListCameras to determine IP if necessary) in order to reset the camera because it doesn't close out elegantly at the moment.
  297   Tue Feb 5 15:32:29 2008 josephbConfigurationCamerasPMC and the GigE Camera
The PMC transmission video camera has been removed and replaced with the GigE GC750 camera for the moment.

A ND4.0 filter has been added in the path to that camera to reduce saturation for the moment.

The old camera has been placed on the elevated section inside the enclosure, and the cable for it is still on the table proper.

The Gige camera is currently running the Snap code on Linux3 with the following command line:

./Snap -E 2000 -l 60 -m 1440 -f './pmc_trans/pmc_trans'

So its going to be taking tiff images every minute for the next 24 hours into the cvs/cds/caltech/target/Prosilica/40mCode/pmc_trans/ directory.

Attached is an example image with exposure set to 2000, loaded into matlab and plotted with the surf command. 2500 microseconds looked like it was still saturating, but this seems to be a good level (with a max of 58560 out of 65535).
Attachment 1: pmc_trans.jpg
pmc_trans.jpg
  300   Wed Feb 6 16:50:47 2008 josephbConfigurationCamerasRegions of Interest and max frame rate
The Snap code has once again been modified such that setting the -l option to 0 will take images as fast as possible. Also, the -H and -W options set the height and width, while in principle the -Y and -X options set the position in pixels of the top edge and left edge of the image. It also seems possible to set these values such that the saved image wraps around. I'll be adding some command checking so that the user can't do this in the near future.

Doing some timed runs, using a -H 350 and -W 350 (as opposed to the full 752x480), 100 images can be saved in roughly 8 seconds, and 1000 images took about 73 seconds. This corresponds to a frame rate of about 12-13 frames per second (or a 12-13 Hz display). The size of this area was sufficient to cover the current PMC transmission beam.

The command line I used was

time ./Snap -l 0 -m 1000 -f 'test' -W 350 -H 350 -Y 50 -X 350 -E 2000

Interestingly enough, there would be bursts of failed frame saves if I executed commands in another terminal (such as using ls on the directory where the files were being stored).

As always, this code is available in /cvs/cds/caltech/target/Prosilica/40mCode/.
  345   Thu Feb 28 16:19:37 2008 josephbConfigurationComputersMafalda rewired and multiple cameras running
1) Mafalda is now connected via an orange Cat5E ethernet cord to the gigabit ethernet switch in rack in the office space. It has been labeled at both ends with "mafalda".

2) Both the GC650M camera (from MIT) and the GC750M are working. I can run the sampleviewer code and get images simultaneously. Unforutnately, the fps on both cameras seems to drop roughly in half (not an exact measurement) when displaying both simultaneously at full resolution.

3)Discovered the Gigabit ethernet card in Mafalda doesn't support jumbo packets (packets of up to 9k bytes), which is what they recommend for optimum speed.

4)However, connecting the cameras through only gigabit switches to Mafalda did seem to increase the data rate anyways, roughly by a factor of 2. (Used to take about 80 seconds to get 1000 frames saved, now takes roughly 40 seconds).

5)Need to determine the bottleneck on the cameras. It may be the ethernet card, although its possible to connect multiple gigabit cards to single computer (depending on the number of PCI slots it has). Given the ethernet cards are cheap ($300 for 20) compared to even a single camera (~$800-1500), it might be worth while outfitting a computer with multiple.
  378   Fri Mar 14 12:06:29 2008 josephbConfigurationCamerasGC750 looking at ETMX while locked
The GC750 (CMOS) is currently looking at the front of ETMX. Unfortunately, its being routed through a 10Mbit connection (which I will be purchasing a replacement for today), so getting it to send images to Mafalda/Linux 2 or 3 isn't working well, but by using a local gigabit switch and a laptop I can get sufficient speed for full images with the sample viewer.

The attached image is from a full 752x480 reslution with 10,000 microsecond exposure with the X-arm locked. Although it looks like I still need to work on the focusing. Will be switching the GC750 with the GC 650 (CCD) later today and comparing the resulting images.
Attachment 1: ETMX_zoom_exp_10000_750.tiff
  379   Fri Mar 14 14:59:51 2008 josephbConfigurationCamerasComparison between GC650 (CCD) and GC750 (CMOS) looking at ETMX
Attached are images taken of ETMX while locked.

The first two are 300,000 microsecond exposure time, with approximately the same focusing/zoom. (The 750 is slightly more zoomed in than the 650 in these images). The second are 30,000 microsecond exposures. The la

The CMOS appears to be more sensitive to the 1064 nm reflected light (resulting in bright images for the same exposure time). This may make a difference in applications where images are desired to be taken quickly and repeatedly.

Both seem to be resolving individual specks on the optic reasonably well.

Next test is to place both camera on a Gaussian beam (in a couple different modes say 00, 11, and so forth), probably using the PMC.
Attachment 1: ETMX_z2_exp_300000_650.tiff
Attachment 2: ETMX_z2_exp_300000_750.tiff
Attachment 3: ETMX_z2_exp_30000_650.tiff
Attachment 4: ETMX_z2_exp_30000_750.tiff
  434   Tue Apr 22 08:34:22 2008 josephbConfigurationCamerasCurrent Network Diagram
The attached network diagram has also been added to the 40m Wiki at http://lhocds.ligo-wa.caltech.edu:8000/40m/Image_Processing_with_GigE_Cameras
Attachment 1: Network.pdf
Network.pdf
  441   Thu Apr 24 11:50:10 2008 josephbSummaryComputer Scripts / ProgramsUseful tidbits learned while tracking the network setup
In process of understanding the network setup I've learned several things:

1) The status lights on C0DAQ_RFMNETWORK.adl are controlled by the fiber network, as opposed to the ethernet network. However, even if everything is working properly on the VME end, you may still need to reboot it in order to be able to contact it via the ethernet (ssh or telnet).

2) After disconnecting the hub out by 1Y9, I was able to telnet into c1vac1, but not c1vac2. I was told that the Turbo pump and Ion pump readbacks on C0VACMONITOR.adl had not been working for awhile (years?). So I went out and rebooted the c1vac2 card. This seemed to restore the epic channels and we now have correct readbacks on the turbo pumps. The ion pumps all are reading no voltage, which is good because they're turned off. However C1:Vac-IPSE_mon is reading "On", although Steve assures me the actual unit is currently off, so there may be a minor channel issue there.
  449   Fri Apr 25 13:53:11 2008 josephbSummaryComputersNetwork setup
This is the promised more in detail summary from Andrey's log ID 444.

What we did was go around to each hub, one at a time, unplug the network connection, and figure out which light on which hub went out. We then, went back to the control room, confirmed that we were still able to talk to the devices connected to the hub, and if not, rebooted them. This process was repeated for each hub.

As it stands, the hubs located at the ends of arms (in racks 1X4 and 1Y9) are connected to the really old 24 port 10 Base T hub located in 1Y7. In addition, the 5 port SMC hub is plugged into the 8 port SMC switch in 1Y5 (which actually has enough ports to simply move all the connections over to it, so I'm not sure why there are two...).

All other hubs/switches are connected back to the control room 24 port switch.

Attached is a simple diagram of the network connections for the 40m lab.
Attachment 1: 40m_network_90.pdf
40m_network_90.pdf
  463   Thu May 1 12:46:02 2008 josephbConfigurationComputersNodus gateway is up
The computer Nodus is now acting as a gateway machine between the GC network and the martian network in the 40m. It has the same passwords as the rana gateway machine.

Its name on the GC side is nodus (ip: 131.215.115.52) and on the martian side is nodus113 (ip: 131.215.113.200). Will need to update the hosts file on the control room machines so you can just use the name nodus113 rather than the full ip.

Software is still being added to the computer, and it will remain in parallel with the rana gateway machine until everything has been working properly for a week or so.
  471   Thu May 8 16:40:36 2008 josephbConfigurationCamerasGige Camera currently on PSL table
Andrey and myself were working on the PSL table today, using a pickoff of a pickoff of the main beam (adding a microscope slide to pickoff ~4% of the original pickoff) to the GC750 GigeCam.

At the time we left, we scanned the area with a beam scan and didn't see any new stray beams, and nothing in any useful beam paths should have changed. We also strung a Cat 6 cable from the control room switch out to the PSL table in the cable trays, and then above the PSL table.

Currently, its not as well aligned as it could be, and also requires a very low exposure setting, of -E 50 or so to avoid saturation.
  473   Fri May 9 10:15:36 2008 josephbUpdateComputersNodus has moved
Steve and myself moved Nodus from under the table in the control room, to just above the Rana computer in the control room rack.
  479   Thu May 15 12:05:49 2008 josephbConfigurationPSLPath to PSL Position QPD
The 50/50 beamsplitter that was being used as the last turning mirror to the PSL Position QPD has been replaced with a Y1-1037-45-S plate. This turning mirror was also moved 4" farther along the beam path, so as to produce as small (few microwatts) transmission through the plate. The lensing optics were also shifted so as to maintain a focused beam on the photodiode. Lastly, the rotating ND filter was increased from 1.5 to 2.0 to reduce the incident power on the photodiode, since twice the power is now reaching it.

The small beam on transmission will be used by the digital cameras as a test beam.
  481   Thu May 15 16:24:18 2008 josephbSummaryCameras 
The GC750 camera is currently looking at a very small pickoff of the PSL output (transmission of a Y1-1037-45-S mirror). The plan is to take images tomorrow with it and the GC650 from the same spot and do comparisons.

For those interested, the camera can be run with two codes, from mafalda. Use ssh -X mafalda to login, to allow the live stream to work with the SampleViewer code. The codes can be found in:

/cvs/cds/caltech/target/Prosilica/40mCode/Snap

and

/cvs/cds/caltech/target/Prosilica/bin-pc/x86/SampleViewer

Type Snap --help for a list of options for that program. Click the circle looking thing in SampleViewer to start the live stream. Note only 1 of the two programs can be running at a time, and the only way to change settings (such as exposure length) is with Snap at the moment.
  482   Fri May 16 14:38:50 2008 josephbSummaryCamerasTwo cameras setup
I've changed the pickoff setup from yesterday for the GigE cameras to include a 33% beam splitter (first one I could find). The reflection is going to the GC650 (CCD camera) while the transimission is going to the GC750 CMOS camera. This means the CMOS camera has roughly twice the light incident as the GC650 and should be kept in mind in all comparisons. The distances from the beam splitter are approximately the same both cameras, but some more accurate positioning might be useful.

Its very easy to get the GC650 camera into a bad state where you need to go out and cycle the power (simply unplug and re-plug in the power supply either at the camera or outlet). If the ListCamera program doesn't see it, this is probably necessary.

Andrey added at 6.30PM: Actually the 650 camera keeps crashing constantly. Every time I attempt to capture an image, the camera fails.
  492   Thu May 22 11:25:19 2008 josephbConfigurationComputers 
One of the new Netgear Prosafe 24 port switches was mounted in the 1X4 rack,, roughly in the middle, away from the top and bottom rack mounted electronics. At the moment, its IP has been set to 131.215.113.250, gateway 131.215.113.2 (which is what I saw as the only listed gateway on linux1 using route -n) and mask 255.255.255.0.

I'm planning to set the next three IP address for the switches as *.251, *.252 and *.253, which don't look to have been used yet.
  501   Wed May 28 12:51:32 2008 josephbConfigurationComputersTwo more switches mounted
Two more Prosafe 24 port switches have been mounted in the racks, one in 1Y9 and one in 1Y6. (The first one was placed in 1X4).

The one in 1Y9 has been set to an IP address of 131.215.113.251, while the one in 1Y6 is set to 131.215.113.252, and these have been labeled as such.
  511   Mon Jun 2 12:20:35 2008 josephbBureaucracyCamerasBeam scan has moved
The beamscan has been moved from the Rana lab back over to the 40m, to be used to calibrate the Prosilica cameras.
  517   Wed Jun 4 13:46:42 2008 josephbConfigurationCamerasChanging incident angle images
Attached are images from the GC650 and GC750 when the incident angle was varied from 0 tilt (normal incidence) to 5,10, and 20 degrees. Each time the beam was realigned via the last turning mirror to be on roughly the same spot. This light was a pickoff of the PSL table light just before it leaves the table.

Images include the raw data, fit to the data, residual normalized by peak power "w(1)", and normalized by the individual bin power.

The first pdf includes 0 degrees (normal) and ~5 degrees of tilt for the GC650 (CCD) camera.

The second pdf includes ~10 and ~20 degrees of tilt images for the GC650 (CCD) camera.

The third pdf includes 0 and ~5 degrees of tilt for the GC750 (CMOS) camera.

The fourth pdf includes ~10 and ~20 degrees of tilt for the GC750 (CMOS) camera.

Things to note:
1) GC750 camera seems to have a structure on the camera itself, somewhat circular in nature. One possible explanation is the camera was damage at a previous juncture due to too much light. Need to check earlier images for this problem.
2) GC650 has "bands" which change direction and thickness with angle. Also at higher incidence angle, the sensitivity seems to drop (unlike the GC750 where overall power level seems to stay constant with increasing angle of incidence).
3) GC650 seems to have a higher noise floor,seen from the last plot of each pdf (where each pixel of the residual is normalized by the power in the corresponding pixel of the fit).
Attachment 1: GC650_0dg_5dg.pdf
GC650_0dg_5dg.pdf GC650_0dg_5dg.pdf GC650_0dg_5dg.pdf GC650_0dg_5dg.pdf GC650_0dg_5dg.pdf GC650_0dg_5dg.pdf GC650_0dg_5dg.pdf
Attachment 2: GC650_10dg_20dg.pdf
GC650_10dg_20dg.pdf GC650_10dg_20dg.pdf GC650_10dg_20dg.pdf GC650_10dg_20dg.pdf GC650_10dg_20dg.pdf GC650_10dg_20dg.pdf GC650_10dg_20dg.pdf
Attachment 3: GC750_0dg_5dg.pdf
GC750_0dg_5dg.pdf GC750_0dg_5dg.pdf GC750_0dg_5dg.pdf GC750_0dg_5dg.pdf GC750_0dg_5dg.pdf GC750_0dg_5dg.pdf GC750_0dg_5dg.pdf
Attachment 4: GC750_10dg_20dg.pdf
GC750_10dg_20dg.pdf GC750_10dg_20dg.pdf GC750_10dg_20dg.pdf GC750_10dg_20dg.pdf GC750_10dg_20dg.pdf GC750_10dg_20dg.pdf GC750_10dg_20dg.pdf
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