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  ATF eLog, Page 56 of 57  Not logged in ELOG logo
ID Date Author Type Category Subject
  59   Sun Jun 1 18:52:49 2008 tobinComputingGeneralborkspace compiling
Following Alex's suggestions, I fixed the front-end problems we were encountering the other day.

To get the shared libraries stuff to work, I inspected the contents of /etc/ld.so.conf.d and 
found it all looking fine.  I ran /sbin/ldconfig, which updates some shared library index 
somewhere, which seemed to fix the problem with the EPICS server finding its libraries.  To create 
the /rtl_mem_atf file, I edited /etc/rc.local, adding "atf" to the list of subsystems.  I believe
that everything now works to compile and run the ATF front-end system.

As a reminder, some useful commands:

cvs update               refreshes the software distribution from CDS
make atf                 recompiles the front-end system
make install-atf         installs new front-end binary and scripts
make install-daq-atf     installs DAQ channel stuff to framebuilder
make install-screens-atf makes new generic MEDM screens

killatf                  Stop the front end code
startatf                 Stop and then start the front-end-code

If you want to change the name of the computer itself, I think you just
need to (1) edit /etc/sysconfig/network and change the hostname; and (2)
etc /etc/hosts on all the machines from which you'll be connecting to the
front-end machine (at the moment, just ws1?).

[fixed command syntax - 7/22/08 DYM]
  58   Thu May 29 20:00:48 2008 tobinComputingFuglyborkspace compiling
Dmass and I tried to compile and install a new system on the borkspace machine here.
We ran into a few difficulties.

First, the startup script for the EPICS server can't find the channel access library.
A hack to fix this is to enter this command in the terminal before running the start

export LD_LIBRARY_PATH=/opt~/epics-3.14.7-x86_64/base-3.14.7/lib/linux-x86

With this, the OMS system front-end runs fine. But we can't start our new system,
ATF. The ATF front-end dies with the error:

[controls@oms advLigo]$ cat /cvs/cds/caltech/target/c2atf/log.txt
cpu clock 2412402
open failed for write on /rtl_epics (45)

I looked in the controller.c code and it appears that the front-end code wants there
to be a special file /rtl_mem_atf. I made one of these using both a hard link, and
then via mknod ("sudo mknod rtl_mem_atf u 150 132"), mirroring the existing rtl_mem_oms,
but neither attempt worked. Will ask Alex for help.
  57   Tue May 20 15:55:31 2008 DmassLaserEOMEOM Phase lag
The attached transfer function was measured with the experimental setup outlined in entry 53. The first transfer function (Raw Data) is the output of the 4395 when I calibrated away the cabling as described in the drawing in entry 53. The high frequency junk is pickup from something; it shows up with the photodiode blocked.

The second transfer function is the first one with the following model divided out:
model=@(f) (i*f).*(1./(1+i*f/380e3)).*exp(-i*2*pi*f*60e-9)
The zero at zero is due to the EOM modulating in phase, not frequency.
The time delay was generated by roughly fitting to the data (to get a white phase response)
The pole at 380 kHz is the cavity pole of the PMC (experimentally determined in entry 56)

The measured time delay based on propagation of cables/free space is 41 ns, so there is an additional time delay of 19 ns +/- 10 ns in our model.
This corresponds to a phase shift of 0.7 degrees at 100 kHz

As we can see from the transfer function - there is clearly more going on than our model takes into account (probably a number of poles). Adding poles would put a tighter constraint on the time delay, which is fine/good.

I used the experimental setup below to measure the transfer function between the EOM (which is before the amplifier) and the reflections off the PMC. The light blue line is what I shorted to each other when I used the 4395's calibrate feature to correct for the cabling/rf components.

The "modulation summation box" is shown below the schematic. I will update this later when I figure out what the components are.
  56   Mon May 19 17:28:44 2008 DmassLaserPMCCavity Pole Measurement on the PMC
Measurement of the PMC cavity pole:

The following was done at powers of .234 W and .42 W.
I turned the laser power on the table down low (using a polarizer and a PBS to dump the majority of the beam).

I then used a function generator to input a triangle wave into the Piezo driver and sweep the cavity. This was done at a frequency of .04 Hz (for reasons dictated by dataviewer).

I found the HWHM (half width half max) of the transmitted intensity (when the DC bias was subtracted out) to be 0.00054 and 0.00053 free spectral ranges for .234 and .42 W, respectively.
I also noticed some nonlinearity in the PMC/Piezo as I scanned through more FSR's, and thus used the data from the bias voltages closest to zero.

I calculated the FSR frequency to be 713.8 MHz (in agreement to what we have on file for the PMC at the 40m).

Using the equality \delta L / L = \delta f / f, I get pole frequencies of 385 kHz and 378 kHz for .234 and .42 W, which is about a 2% agreement between measurements.

Again - the cavity pole was measured to be about 380 kHz to within a couple percent. - this differs significantly from the pole quoted for the 40m PMC at
http://www.ligo.caltech.edu/~ajw/PSLPMC.png (which is 488 kHz)
  55   Tue May 13 12:37:31 2008 DmassLaserFiberNew fiber
We got a box of fiber from Boston (Marie Woods). It is now on the optics table in the bridge basement.

The fiber has some writing on it. It says printed on the fiber in ink:
"OZ OPTICS LTD BC# 2887" and gives their tel # as 613-831-0981.
There is also a label on the fiber that says:
SN: T872391-01"

Picture below:
  54   Wed May 7 04:44:31 2008 DmassComputingGeneralDTT and Fast Channels fixed
The playback in dataviewer on the fast channels was semi broken (would not display full data on a playback, but could do all else).

Also, DTT was giving an error "failed to start diagnostics kernel" whenever we attempted to launch it.

I talked to Alex and he managed to fix both of these problems.
  53   Tue May 6 18:18:59 2008 DmassLaserEOMEOM Phase lag
I used the experimental setup below to measure the transfer function between the EOM (which is before the amplifier) and the reflections off the PMC. The light blue line is what I shorted to each other when I used the 4395's calibrate feature to correct for the cabling/rf components.

The "modulation summation box" is shown below the schematic. I will update this later when I figure out what the components are.
  52   Mon May 5 20:32:50 2008 DmassComputingGeneralMEDM, FB, FE, Etc
I restarted the oms box in the rack, and was in the process of trying to get new medm control screens up with Rob. I now have neither the old mislabelled oms screens, nor the new soon to be beautiful screens, as well as no way to finish my measurement of the PMC cavity pole until I get those back up and running.

Will be reading

and if that fails,
Will bug Alex or Stefan tomorrow.
  51   Fri May 2 22:54:44 2008 DmassComputing Screens
I made a simulink model and put it here: /cvs/cds/advLigo/src/epics/simLink/atf.mdl

as instructed by the rolf wiki:

I then changed to the advLigo directory on oms, and "make atf" seemed to run successfully. Before finishing the process, I got the following error when dealing with c2atfepics:

[controls@oms c2atfepics]$ cat iocC2.log
dbLoadDatabase "dbd/a.dbd"
dbLoadDatabase "dbd/atf.dbd"
dbLoadDatabase "dbd/get_local_time.dbd"
dbLoadRecords "db/C2/local_time.db"
dbLoadRecords "db/C2/atf1.db"
Starting iocInit
### EPICS IOC CORE built on Aug 10 2005
### EPICS R3.14.7 $R3-14-7$ $2004/12/06 22:31:52$
iocInit: All initialization complete
seq &atf,("ifo=C2, site=caltech, sys=ATF, sysnum= 10")
SEQ Version 2.0.10: Wed Aug 10 23:41:07 2005
cas warning: Configured TCP port was unavailable.
cas warning: Using dynamically assigned TCP port 46391,
cas warning: but now two or more servers share the same UDP port.
cas warning: Depending on your IP kernel this server may not be
cas warning: reachable with UDP unicast (a host's IP in EPICS_CA_ADDR_LIST)
Couldn't open `/rtl_mem_atf' read/write
open("rtl_epics"): No such file or directory
  50   Fri May 2 22:00:17 2008 DmassComputing Daq Channels
I activated the channels C2:OMS-SUS_T3_ACT_OUT and C2:OMS-SUS_LEFT_IN1 in daqconfig, set both to acquire, and saved them to cvs/cds/caltech/chans/daq/C2OMS.ini

Real screens and naming conventions to follow.

[Edit: I do not know how to disable the auto smileys, so : O is seen as Yawn]
  49   Fri May 2 21:39:13 2008 DmassLaserPSLLaser power on table lowered
I have changed the polarizer before the polarizing beam splitter to minimize output power.

I did this to measure the PMC pole at as low a power as possible.

This will make power trends (which are picked off after the PBS) look VERY low for a bit.
  48   Fri May 2 21:09:26 2008 DmassLaserGeneralStrange Noise
We may want to set up a microphone and see if the noise is correlated to the sharp power fluctuations in the laser.

Something on the table or under it is periodically making a squeeking noise. Stefan claims this is not new though neither of us can localize it (it's < 1sec duration). Unsure as to what is the offending noisemaker.

[Update - the noise happens when the laser is off, comes from side of table (possibly beneath) opposite laser]
  47   Fri Apr 25 13:33:35 2008 DmassLaserPSLpower drift
Here is a trend of the power drift taken over 10 days. The units are in counts produced by a photodiode stationed at a lower power pickoff of the beam.

The first plot is a full 10 days - you can see the times during which the laser was off where the counts go to zero.

The second plot is the full data over 10 hours, which seems to imply that the sharp increases in power are real.

Negative values correspond to an increase in power.
  46   Tue Apr 22 20:07:50 2008 DmassLaserPSLProfile of 35W PSL
The total power seemed to be down about 10%, and that lower number was divided between two beams at the output. They opened up the amplifier and realigned things within it, which seems to have fixed the multibeam/lower power we were encountering before.


I scanned the beam on the 35W laser again (for the first time since it was fixed by our German friends during the LSC meeting).

What did they fix? And how?
  45   Tue Apr 22 16:25:24 2008 robLaserPSLProfile of 35W PSL

I scanned the beam on the 35W laser again (for the first time since it was fixed by our German friends during the LSC meeting).

What did they fix? And how?
  44   Fri Apr 11 17:15:49 2008 DmassLaserEOMTransfer Function
We traded network analyzers and now can go below 100kHz in our measurement. The following transfer function was taken with an HP 4395A.

The previous measurements were done with the PMC not locked to the laser, so the measurement was repeated using RF Reflection locking (sidebands @ 35MHz).

Another important thing we discovered was that the frame of the table is ungrounded, which led to significant noise leaking into the error signal when we let a BNC cable touch it. Schematic of experimental set up to follow.

Not all of the cables/electronics were calibrated out in the measurement below.
  43   Fri Apr 11 16:37:03 2008 Stefan BallmerComputingGeneralSet up CDS wireless router / controlling from nokia handheld works
I set up a CDS wireless router:
SSID: cdsrana
Unname & PWD written on router

It has WEP and MAC-filtering enabled.

With that I was able to use the little Nokia handheld to control the digital system.
- start x-terminal
- 'cd'
- 'ws1'
(this just starts ssh to ws1)
- startSlider
(this bring up the offset slider for the PZT control loop), or
- startmedm
(this starts the OMS main screen)

We have to make medm screens that work for the little Nokia screen....
  42   Mon Apr 7 16:43:15 2008 DmassLaserPSLProfile of 35W PSL
I scanned the beam on the 35W laser again (for the first time since it was fixed by our German friends during the LSC meeting).

A picture of the setup is below.

Images of the profile, 2d and 3d are below as .bmp, and the generating data for these is in Apr7_08scan.asc (zipped text)

This profile is significantly cleaner than the one measured in entry 31 of the elog.
  41   Thu Apr 3 17:56:35 2008 DmassLaserEOMTransfer Function
Transfer function part 2:

I repeated the measurement with impedence matching where I could (not inside the laser box), and did some CRUDE fitting with matlab.

I also herby acknowledge that png > jpg.

The tau is the time delay which makes the green curve on the phase plot coincide with the data at high frequency.

No locking was used. The 00 mode was reached for short periods of time through input to the laser crystal temperature during which time the measurement was taken.

The input to the EOM was removed and connected to the PD output and calibrated out with the network analyzer.

The analyzer used to do this measurement has now been traded for a HP 4395A (which goes down to 10Hz).
  40   Tue Apr 1 20:50:37 2008 DmassLaserEOMTransfer Function
(With Stefan's help) I took the transfer function between the EOM of the PSL, and the Photodiode on the PMC's reflected light. We looked at the lower frequency as well with another analyzer (up to 50 MHz).

The very low frequency features seem to be junk, and we can see what looks like ~f in the low frequency transfer function.

In the higher frequency range, there seem to be resonances corresponding to a FSR of about 22 MHz (long.) starting around 11 MHz. The low end seems to behave as expected, and go as frequency. (Note that the units on the non-log bottom plot are in x10^7 Hz)
  39   Thu Mar 27 13:25:38 2008 Stefan BallmerLaserISSModifications to ISS (D080149-00-C)
  38   Fri Mar 7 15:33:14 2008 DmassLaserEOMEOM shipped
I packaged up and shipped the EOM back to UF. The translation stage, also theirs, was sent with it. Everything is marked c/o Guido Mueller.
  37   Tue Mar 4 16:00:28 2008 DmassLaserPSLISS
I moved the (non logging) ISS PD after the PMC, and changed the mirror/camera setup some.

Setup post PMC should now have ~5% of the power going to the camera, with the rest going to a BS for the ISS photodiodes.
  36   Mon Mar 3 01:21:19 2008 ranaLaserMOPApower drift
This plot shows the power drift over the last few days.
The SIDE_OUT16 channel is the one. The y scale is zoomed in here but
zero corresponds to zero power. The faster spikes have a ~45 minute time scale.

No idea what this is yet.
  35   Wed Feb 27 17:56:45 2008 Stefan BallmerElectronicsGeneral 
The 2nd HP 6209B 320V power supply initially didn't work because one of its backplane connectors had fallen off.
It has been fixed, and is now on the shelf, ready to be used.
  34   Wed Feb 27 17:14:47 2008 Stefan BallmerElectronicsGeneralPZT driver powered up
- Powered up the PZT driver board using the 300V power supply (the one that's working).
- I haven't measured the noise or TF of the PZT driver box, but I
connected it to Ch3 (T3_ACT) and loaded a 10^2:1^2 anti-dewhitening filter.
(That's what the schematics asks for.)
- Removed the SR560 from the control loop & connected the demod error signal
to ch3 (TOP3).
- I put the control filter into the input filter module, because I needed the DOF4
control filter bank for a relief servo, and we need an offset adjust after the
relief servo for locking.
  33   Tue Feb 26 21:05:47 2008 Stefan BallmerLaserGeneral 
Additionally to what Rana mentioned, there are two more signals hooked up:

SUS_LEFT (Ch4): PMC PZ control signal (from the SR560 loop)
SUS_RIGHT (Ch5): PMC transmitted power

We also hooked up the SUS_L_ACT (Ch4) DAC to the Laser temperature control.
Using this we closed the slow loop for the PMC
  32   Tue Feb 26 19:52:08 2008 RanaElectronicsCDSchannels
Stefan, Rana

We changed the cable hookup -- to check out the AI box + ADC.
Ch1 = 3 Vpp offset from a SRS function generator    C2:OMS-SUS_TOP1_OUT_2048
Ch2 = 50 Ohms                                       C2:OMS-SUS_TOP2_OUT_2048
Ch6 = ISS SENSE PD DC output                        C2:OMS-SUS_SIDE_OUT_2048

The laser is now on and set to record the power fluctuations over a long term. The value of the SIDE input gain
is set such that SUS_SIDE_OUT16 is in units of mW on the Ophir high power head.


We also noticed that the signals coming out of the AI box are very aliased. The thing is running at 2048 Hz but we think
that the AA and AI filters have 10 kHz cutoffs (D070081-00).

- Redo the FE diagram to get rid of OMC SUS and make a PSL diagram.
- Get the trending working right.
- Up the FE sample rate to 32768 Hz
  31   Sat Feb 16 15:33:25 2008 DmassLaserPSLRadial Beam Profile
The following were taken with the beam scanner (having gone through a number of optical elements).

After leaving the main laser housing, the beam hits:
polarizer -> PBS -> low reflectivity pickoff mirror -> 1m lens -> 0.5m lens -> 45-P HR mirror -> 45 P HR mirror -> beamscan.

In taking my initial waist measurements, I had the beamscan after the LR pickoff, and the beam looked similar.
  30   Sat Feb 16 13:46:19 2008 DmassLaserPSLLaser Aperture closed.
Laser was powered up with the aperture closed. It was fairly warm to the touch. I opened the aperture. I don't know if it is a "bad thing" to be dumping all 35W on the stop for large times. Sat @ 1:40.
  29   Tue Feb 12 17:00:35 2008 DmassLaserPSLMode Matching/Lock
I got a solution for mode matching the 35W to the PMC with 2 100mm (focal length) lenses. I abandoned this since they were deemed too fast by Stefan, and were seperated by ~1 focal length. We ended up using a 1m and .5m lens (all lenses from the newport kit in 058). My code choked on this solution and needs some bugs ironed out (will attach afterwards), so we used Stefan's.

We then managed to get a 00 lock, at a somewhat meager power throughput. Pictures of the layout below:
  28   Tue Feb 12 16:54:13 2008 DmassLaserPSL35W profile/waist
The beam output by the 35W in 058 was significantly elliptical (up to a 10% difference in the waist measurements). I used the profile given by the "more gaussian" axis, and found a waist 9.7 cm inside the front of the enclosure, 250 microns in radius. We ended up using this axis to mode match to, but this ellipticity will probably need to be addressed as we try to maximize the power output through the PMC.

[plots to be added]
  27   Sun Feb 10 13:27:57 2008 Stefan BallmerComputingGeneralPictures of Bork-Space setup
  26   Sun Feb 10 13:18:07 2008 Stefan BallmerLaserGeneralTrend of Laser Power over 20h
Attached is a snapshot of the laser power over the last 24h.
The input gain is such that 1 count corresponds to about 1 mWatt
of power after the polarizing beam splitter, i.e. the the lambda/2 plate
was set to about 4 Watts.

I don't know where the short surges of power come from.
  25   Tue Feb 5 18:59:07 2008 Stefan BallmerLaserGeneralBork-space running
- Used the new Bork-space system to lock the PMC with a UGF of 100Hz.
- Hooked up a temporary power monitor (using the DC of one of the ISS PD's)
to ADC Channel 6. For the moment this can be used to trend the power.

- Accidentally blew the output opamp in the ISS monitoring chain - i.e. the ISS out-of-loop
monitor is currently unusable. Needs to be fixed.
  24   Wed Jan 30 12:57:53 2008 DmassLaserPSLCharacterizing Beam
1/28/08 - Took a series of beam waist measurements on the YAG.

-The polarizations (as measured by the photon beamscanner) had very different profiles. One polarization has a dual peak (probably a reflection from some optic). This shows up after the beam has passed through the polarizer, the PBS, and one mirror.

-Initial beam characterization yielded a waist inside the Laser Box by ~3", at a width of 200 microns. Will be rechecking this. (Impossible if there is a lens at the opening, which I'm not sure is the case).
  23   Tue Jan 29 12:50:00 2008 DmassThings to BuyGeneralThings to buy wiki
Temporarily located on the 40m wiki until AdhikariWiki is released.

  22   Tue Jan 29 12:47:44 2008 DmassLaserGeneralStrange Noise
Something on the table or under it is periodically making a squeeking noise. Stefan claims this is not new though neither of us can localize it (it's < 1sec duration). Unsure as to what is the offending noisemaker.

[Update - the noise happens when the laser is off, comes from side of table (possibly beneath) opposite laser]
  21   Mon Jan 28 18:02:04 2008 Stefan BallmerLaserGeneral1.2MHz Laser intensity oscillation
While working on the PDH loop for the PMC I noticed
a 1.2MHz oscillation on the laser intensity:

- It seems to be a bistable state: it was generally
started by some transient in the piezo input of the laser.
- The oscillation persists even when all control inputs to the laser
(EOM, PZT, AOM) are disconnected.
- It's extremely strong: about 20% fractional modulation
- Power-cycling the laser usually fixes the problem.
  20   Mon Jan 28 16:51:06 2008 Stefan BallmerLaserPSLPDH locked pre-mode cleaner
Since we suspect that the ISS might be jitter-noise limited I started looking at the Pre-Mode Cleaner (PMC).

- Did a rough mode-matching with one lense into the PMC
- Aligned the PMC. Note that the camera is now in transmission of the PMC.
- Used 3MHz drive to the laser's EOM and a photo diode in reflection of the PMC for
PDH locking. Successfully closed the loop using a mixer and SR560, driving
the laser's piezo - however only on a 2-0 mode.
- The 30V power supply I currenctly use to pre-set the PMC PZT does not have
enough range to scan a full FSR, and I can't get the 00 mode into range.

David - feel free to dismantle the path into the PMC and properly measure the beam parameters.
  19   Thu Jan 24 19:43:53 2008 StefanElectronicsISSISS servo work
- Modified ISS: Bypassed differential driver & moved 2kHz pole to the first summing opamp.
- Installed an out-of-loop diode.
- Out-of-loop noise at 90Hz: ~8e-8 RIN/rtHz

Plot 1 shows the OLG.
The loop gain was set to 150kHz - just because I
didn't have the gain adjust hooked up.

Plot 2 shows the out-of-loop intesnity noise.
It is acoustic noise limited (except for the power lines).
  18   Wed Jan 2 15:10:24 2008 tobinLab InfrastructureHVACLab Temperature
The lab temperature appears to have been stable over the holiday, always between 68.5 and 70.0 degrees F. (There is no data from Dec 28-29 due to a computer reboot.)
  17   Wed Dec 26 21:30:05 2007 ranaLaserPSLlaser power
I have rewired the laser power so now the Diode Box goes directly to one of the
overhead umbilicals (circuit #29) which is energized by the wall switch which
is marked as "Master Laser". Cutting off that switch is NOT the desired way to
power down the laser; use the Beckoff touchpad instead. The wall switch is the
emergency cutoff.

The HEPA fans on the laser table are both routed to power strips on the table now.

With the laser on, the beam looks well clipped. As far as I can tell this comes
from inside the box so the next thing is to do a little more re-alignment inside
the box.

Also need some more lenses for cameras and more IR cards.

And we should slice the tires of anyone who borrows equipment without leaving a note!
  16   Fri Dec 21 21:27:12 2007 tobinLab InfrastructureHVACLab Temperature
Extech: 67.9F, 26%RH. Met One: 68F, 20%RH. Clear & cold outside.

Particle counter log looks stable.
  15   Tue Dec 18 13:49:50 2007 tobinLab InfrastructureHVACLab Temperature
Extech: 68.6F, 57%RH. Met One: 68F, 53%RH. Drizzling outside.

Particle counter log shows stable temperature 67.5-69.5F over the last four days.
  14   Thu Dec 13 18:47:02 2007 tobinLab InfrastructureHVACLab Temperature
Extech: 66.8F, 25%RH. Met One: 68F, 20%RH.

Here is the datalogger's contents:
A  121307 161942 0100 0.3 000000 0.5 000000 TMP 000680 R/H 000130 LOC 000000 C/S 000E54
A  121307 164641 0100 0.3 000000 0.5 000000 TMP 000680 R/H 000130 LOC 000000 C/S 000E53
A  121307 171340 0100 0.3 000000 0.5 000000 TMP 000685 R/H 000130 LOC 000000 C/S 000E52
A  121307 174039 0100 0.3 000000 0.5 000000 TMP 000680 R/H 000200 LOC 000000 C/S 000E53
A  121307 180738 0100 0.3 000000 0.5 000000 TMP 000680 R/H 000210 LOC 000000 C/S 000E57
A  121307 183437 0100 0.3 000000 0.5 000000 TMP 000680 R/H 000210 LOC 000000 C/S 000E56
A  121307 190136 0100 0.3 000000 0.5 000000 TMP 000680 R/H 000195 LOC 000000 C/S 000E5C
A  121307 192835 0100 0.3 000000 0.5 000000 TMP 000685 R/H 000195 LOC 000000 C/S 000E69
I'm not sure why it only starts at 12:13pm today. Also, looks like its clock is 50 minutes fast.
  13   Wed Dec 12 16:19:00 2007 tobinLab InfrastructureHVACLab Temperature
I connected the particle counter to the Dell computer for PEM data logging (temperature, humidity, and particle count). The data shows that while the temperature is comfortable right now, it was quite warm in here yesterday (78 degrees). A plot is attached.

For this I made a serial cable using two DB9-to-RJ45 converters and a length of Cat5 ethernet cable. The computer end of the cable has a female connector; the particle counter end of the cable has a male connector. Only three conductors are connected: transmit (pin 2), receive (pin 3), and ground (pin 7 on the particle connector, pin 5 on the computer). I used the USB-to-serial dongle, which shows up in Linux as /dev/ttyUSB0.

Someone later can write a script to automatically poll the particle counter for new data. For now, I just emptied its internal buffer, which stores the last 200 measurements. The secret to communicating with the particle counter, which I learned by examining the c1psl statecode at the 40m, is to first transmit the letter "U". After this, the particle counter will listen to you and do what you say. In particular, sending a capital letter "A" will cause the counter to emit the next measurement from its buffer, until there are none left, at which time it will just respond with "#". To read the data I just ran a "cat /dev/ttyUSB0" command in one terminal, while in another terminal I ran a loop "while 1; echo -n A > /dev/ttyUSB0; sleep 1; end". I set the serial port parameters (9600BPS, 8N1) using Minicom.

Also, there's a Matlab script to parse and plot the output, in ~controls/tobin.
  12   Wed Dec 12 16:10:19 2007 tobinLab InfrastructureHVACLab Temperature
The lab temperature at 2pm was a comfortable 69 degrees.
  11   Wed Nov 28 16:20:04 2007 Andrey Lab InfrastructureGeneralEnclosure cleaning
Previous Tuesday, Nov. 20, I tried to wipe the curtain plastic enclosure around the optical table with the laser using methanol. It turned out, though, that methanol damages the surface of the enclosure, dissolving it and leaving lines/ traces. I stopped my activities with methanol after I realized that negative effect on three corner strips of enclosure.


I tried 25% solution of isopropil alcohol in water on Wednesday, Nov. 21, and such mixture did not have any bad effect on the surface of the enclosure. I wiped the curtains, so they should be clean of dust now.

  10   Tue Nov 13 19:06:18 2007 ranaLaserPSLISS servo work
400 kHz !? Wow.

We should lower the resistors in the PD head so that we can put ~20-30 mA per diode
and use the ISS style diodes for both the in-the-loop as well as out-of-loop diodes.

Then we have to dump the beams reflecting off the diodes onto razor dumps and also
put in a lens so that the beam has a 0.3 mm dia. on the diodes.

Then we make an acrylic box with an entrance hole for the beam and put it over both
ELOG V3.1.3-