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  40m Log, Page 153 of 341  Not logged in ELOG logo
ID Date Author Type Category Subjectup
  12260   Wed Jul 6 21:50:21 2016 KojiUpdateComputer Scripts / ProgramsNew Tabs and Working Summary Pages

It seemed something has been done. And I got cron emails.
Then, it seemed something has been done. And the emails stopped.

  4129   Mon Jan 10 16:39:36 2011 josephb, alex, rolfUpdateCDSNew Time server for frame builder and 1PPS

Alex and Rolf came over today with a Tempus LX  GPS network timing server.  This has an IRIG-B output and a 1PPS output.  It can also be setup to act as an NTP server (although we did not set that up).

This was placed at waist height in the 1X7 rack.  We took the cable running to the presumably roof mounted antenna from the VME timing board and connected it to this new timing server.  We also moved the source of the 1PPS signal going to the master timer sequencer (big blue box in 1X7 with fibers going to all the front ends) to this new time server.  This system is currently working, although it took about 5 minutes to actually acquire a timing signal from the GPS satellites.  Alex says this system should be more stable, with no time jumps. 

I asked Rolf about the new timing system for the front ends, he had no idea when that hardware would be available to the 40m.

Currently, all the front ends and the frame builder agree on the time.  Front ends are running so the 1 PPS signal appears to be working as well.

  17099   Tue Aug 23 14:59:15 2022 JCUpdateToolsNew Toolbox at Y-End

A new tool box has been placed at the Y-end! Each drawer has its label so PLEASE put the tools back in their correct location. In addition to this, Each tool has its assigned tool box, so PLEASE RETURN all tools to their designated tool box. The tools can be distinguished by a writing or heat shrink which corresponds to the color of the tool chest or location. Photo #2 is an example of how the tools have been marked.

Each toolbox from now on will contain a drawer for the folllowing: Measurements, Allen Keys, Pliers and Cutters, Screwdrivers, Zipties and Tapes, Allen Ball Drivers, Crescent Wrenches, Clamps, and Torque Wrenches/ Ratchets.

Attachment 1: 9AFD3E49-0C5B-4626-889A-0A5C62590AD7.jpeg
9AFD3E49-0C5B-4626-889A-0A5C62590AD7.jpeg
Attachment 2: 99EC2EB1-EEA0-4AD8-B6D7-A494431E91E5.jpeg
99EC2EB1-EEA0-4AD8-B6D7-A494431E91E5.jpeg
  2029   Wed Sep 30 17:49:21 2009 JenneUpdateAdaptive FilteringNew UP/DOWN scripts for OAF

[Sanjit, Jenne]

The up and down scripts accessible from the OAF (still C1:ASS-TOP) screen are now totally functional and awesome.  They are under the blue ! button.  The up script can either be for the Seismometers, or the Accelerometers at this time.  The only difference between these 2 is which burt restore file they look at:  the seismometer version puts all 7 seismometer channels in the PEM selecting matrix, while the accelerometer version puts the 6 accelerometer channels in that matrix.  Both scripts also turn on HP_1mHz filters in the ERR_EMPH filter bank and all of the witness filter banks, and the AA32 and AI32 filters in ERR_EMPH, CORR and PEM filter banks.  This makes all of the starting filters the same between the witness paths and the error path.

If you want to use a different combination of sensors, run one of the up scripts, then change the PEM matrix by hand. 

The down script disables the output to the optics, and resets the adapted filter coefficients.  DO NOT use this script if you're trying to "pause" the filter to take some nice long averages.

  14391   Wed Jan 9 11:07:09 2019 gautamUpdateVACNew Vac channel logging

Looks like I didn't restart all the daqd processes last night, so the data was not in fact being recorded to frames. I just restarted everything, and looks like the data for the last 3 minutes are being recorded yes. Is it reasonable that the TP1 current channel is reporting 0.75A of current draw now, when the pump is off? Also the temperature readback of TP3 seems a lot jumpier than that of TP2, probably has to do with the old controller having fewer ADC bits or something, but perhaps the SMOO needs to be adjusted.

Quote:
 

Gautam and I updated the framebuilder config file, adding the newly-added channels to the list of those to be logged.

Attachment 1: Screenshot_from_2019-01-09_11-08-28.png
Screenshot_from_2019-01-09_11-08-28.png
  2464   Tue Dec 29 04:28:27 2009 kiwamu, rana, haixingUpdateCamerasNew Video Switch Installed

We have installed the new Video Matrix.

Its still in an intermediate state, so don't try to "fix" anything before Kiwamu and I get back onto it in the afternoon.

The status so far is that we have removed the old switch (it was a 256 input x 128 output !! mux)  and installed the new one in the same rack. We have hooked it up to the CDS network and have set up its matrix by using the web interface (i.e. NOT EPICS).


Along the way, we discovered that there is lack of impedance matching in the video all over the 40m. Video signals are RF and need to be treated that way. The PSL signals are T'd around and sent on 50 Ohm cables to high impedance monitor inputs.

We should eliminate any switches besides the new one (called Luciana) and control the PSL's Video Monitor from the main MUX interface. No more Rogue Video Switches.

 


Another couple of things we have found is about RCR camera.

(1) The long cable which connects the RCR camera box and the video matrix doesn't work. Although the signal is alive and we can see it by the local tv monitor nearby PSL.

(1) The reflected beam going to the camera is too weak to see in the monitor.  We found a strange polarized cube splitter in front of the camera. We should modify it sooner or later.

  135   Wed Nov 28 19:02:41 2007 AndreyBureaucracyWIKI-40M UpdateNew WIKI-40M page describing Matlab Suspension Modeling

I created the WIKI-40m page with some details about my today's talk on the 40-m lab meeting.

The address is:

http://lhocds.ligo-wa.caltech.edu:8000/40m/Modeling_of_suspensions

(or you can go to the main page, http://lhocds.ligo-wa.caltech.edu:8000/40m/ , and click on the link "Modeling of suspensions").

The WIKI-40m page describes my transfer functions and contains the pdf-file of my presentation.
  461   Wed Apr 30 20:48:58 2008 AndreySummaryPEMNew Weather Channels

I created the new channels for the weather station, all letters are capital ones. They are of the form "C1 : PEM-WS_PARAMETER" where "PARAMETER" is temperature, pressure, wind,... characteristics (names are self-obvious).

These new weather channels are indicated on the "Weather Checklist" MEDM screen. Also, units of pressure were changed from Pascal to torr and mbars.

The new weather channels are also visible in Dataviewer. I updated the template, and as an example of Dataviewer data I attach the following 5-hour trends of weather parameters from 3.30PM to 8.30PM on April 30th.
Attachment 1: April30-5hours.png
April30-5hours.png
  11916   Wed Jan 6 16:40:49 2016 ericqUpdateGeneralNew WiFi router

The new wifi router, a Netgear R6400, has been installed, next to the old one which is disconnected (but not yet removed). 

Same SSID, and I've added only the wireless MAC addresses of viviana, paoloa and asia, the three thinkpads inside.

Qualitatively, dataviewer at the X end seems pretty snappy. I'll do some more quantitative comparison of the two routers at some point soon. I will update the wiki, too.

  11923   Fri Jan 8 22:37:17 2016 KojiUpdateGeneralNew WiFi router

I configured a new wifi bridge for a GPIB Instruments.

The some facts are described on https://wiki-40m.ligo.caltech.edu/Network

The setting up wasn't so straight forward. I added more details there as a linked page.
One thing I had to do with the martian wifi router was that I had to separate the name of SSIDs for 2GHz and 5GHz networks.


Now the data download from Agilent is super fast!
The first establishing the connection takes the most of the time, and the data transfer takes literary nothing.

controls@pianosa|netgpibdata > time ./netgpibdata -i 192.168.113.167 -d AG4395A -a 10 -f meas01
Connecting to host 192.168.113.167, GPIB 10...
done.
Data will be written into meas01.dat.
Parameters will be written into meas01.par.
Writing measurement data to file...
Writing to the parameter file.

real    0m4.056s
user    0m0.068s
sys    0m0.020s

 

  12052   Mon Mar 28 22:16:44 2016 KojiUpdateGeneralNew WiFi router

I configured three more mini wifi extender. They are ready to use.

We should add these to the host table (I forgot where it is)

192.168.113.233 NETGEAR_EX3700_1
192.168.113.234 NETGEAR_EX3700_2
192.168.113.235 NETGEAR_EX3700_3
192.168.113.236 NETGEAR_EX3700_4

  2475   Tue Jan 5 01:31:09 2010 JenneUpdateWienerFilteringNew Wiener Filters installed in PEM IIR matrix on OAF screen

Using the techniques employed at LLO, and then by Rana here at the 40m a few weeks ago, Wiener filters have been installed on the inputs of all of the PEM IIR channels which are hooked up to the 110B PEM ADCU.  Some slight modifications have taken place to the code, and it's all been checked in to the 40m svn. 

I have installed the filters into:  All 6 Wilcoxon accelerometers, the Ranger seismometer, and one of the Guralps (GUR1).  The other Guralp is currently connected through the ASS/OAF machine's ADC, so it's not used in this test. The filters are all labeled "Wiener", and are FM1 in the C1:ASS-TOP_PEMIIR_## filter banks.

The first figure below is the output of the Wiener Filter calculation program.  It shows the uncorrected MC_L (black) and the corrected MC_L (red), using the optimal wiener filter.  This is as good as we should be able to do with these sensors in these positions.

The second figure is a DTT shot of me trying out the nifty new filters.  They seem to maybe do a teensy bit on the microseism, but otherwise it's a bit unremarkable.  Hopefully I'll get better subtraction during the day, when the base level for MC_L is higher.  Here, Black is uncorrected MC_L, Red is the corrected MC_L, Blue is the actuation channel, and green is an example seismometer channel to illustrate the ground motion at the time.

 

For posterity, since it's not all in one elog that I can find, the order of operations to install a Wiener Feed Forward filter is as follows:

1.  (When you can borrow the IFO) Take a very careful TF of the plant, between your actuation point and your error signal readout.  At the 40m, this means between C1:ASS-TOP_SUS_MC1_EXC and C1:IOO-MC_L, since we actuate by pushing on the MC1 coils.  At the sites / future 40m, this would be between the HEPI (or STACIS) and the error signal.  The limit of how good your Feed Forward can do will depend heavily on how good this TF is.  Coherence should be above ~0.95 for all points.  Export this data from DTT as a .txt file, using units "Complex (abs/rad)". 

2. Run fitMC12MCL.m (or equivalent wrapper file) to fit the transfer function you just took with some Poles and Zeros.  Make sure to edit the wrapper file with your new .txt file's name so you're getting a fresh TF (if you've just taken one).

3. (Again, when you can borrow the IFO) Run getMCdata.m (or equivalent) to fetch witness channel data and error signal data.  At the 40m, this usually means C1:IOO-MC_L, and witness sensors which are around the MC chambers.  This data should be taken at a time when the cavity is locked, but pretty much on it's own. (i.e. probably shouldn't have Common Mode feedback on the MC - so the MC should be locked, but not the full IFO, for example.)

4.  Run c1winoiir.m (the main program here, which contains some of these notes). This will take in the TF data you've fit, and the witness channel data you have, and calculate the optimal combination of Wiener filters for your witness channels.  It pre-filters your witness data by your TF, then calculates the Wiener filter.  The resulting FIR filters are saved in a file.

5.  Run firfit.m  This will take the FIR Wiener filters you've just created, and convert them conveniently to IIR filters, in a format to be copied directly into Foton.  For each witness channel, you'll get the IIR filter in 2 formats:  the first is for copying into the Foton .txt file (ex ASS.txt), and the second is for copying into the Foton gui, in the "Command" box on the filter design screen.  The "o" at the end of the copy-able filter indicates to Foton that it is a Z-Plane Online filter.  Copy filters appropriately (there should be a line preceding each set of SOS filter formats to indicate which channel this Wiener filter is for...these channel names are extracted from your getMCdata.m)

6. Save your Foton file, and update your Coefficients in MEDM.  Enable your outputs to actuators, and watch magic happen!

 

On the To-Do list:

Check the transfer of signal btwn PEMIIR matrix and the 9x1 'matrix' that sends the signals to the SUS inputs.  In the SimuLink, the input to the 9x1 matrix is a bundle of 8 numbers (the 8 outputs of the PEMIIR matrix), but it looks like it only pays attention to the first one.  Need to figure out how to make it realize that it's a bundle, not a single number. 

Also, the OAF up / down scripts don't seem to be working on any of the control room computers.  This needs to be checked in to / fixed (but not tonight....)

Attachment 1: MCwino-FFtest_4Jan10_sameFiltersAsinEPICS.png
MCwino-FFtest_4Jan10_sameFiltersAsinEPICS.png
Attachment 2: OAF-FF_test_4Jan10.png
OAF-FF_test_4Jan10.png
  2480   Tue Jan 5 17:32:59 2010 JenneUpdateWienerFilteringNew Wiener Filters installed in PEM IIR matrix on OAF screen

EDIT 6 Jan 2010:  Shouldn't have done this.  My bad.  The AA32 is on the other PEM matrix because the Adaptive code runs at 64Hz, so there's downsampling, calculating, and upsampling which goes on.  The Feed Forward path all runs at 2kHz, the regular rate of the ASS/OAF machine.  All of these filters are turned off (although I haven't deleted them from Foton).  Since we're focusing on low frequency stuff and trying to get that to do some subtraction, we're not worrying about the junk at higher frequencies just yet.

 

I have put AA32 filters into the PEMIIR matrix's input filter banks (ie, C1:ASS-TOP_PEMIIR_##), to match the ones that are in the same places in the regular PEM matrix on the OAF screen. 

I redid the uncorrected vs. corrected MC_L DTT printout, shown below. You can see that there's less junk at higher frequencies in the Blue (actuation channel) trace, which is good.

Attachment 1: OAF-FF_test_5Jan10.png
OAF-FF_test_5Jan10.png
  981   Mon Sep 22 21:54:05 2008 ranaUpdateASSNew Wiener result with x10 gain in ACC
The 2 attached PDF files show the performance of the Wiener filter code on 2 hours of data
with a 4000 tap filter on 64 Hz data. All 6 accelerometers around the MC and the Ranger seismometer
were used.

I attribute the improved performance in the 3-10 Hz band to the better SNR of the ACC channels. To
do better below 1 Hz we need the Guralps.
Attachment 1: f.pdf
f.pdf f.pdf
  3237   Fri Jul 16 15:57:19 2010 josephb,kiwamuUpdateComputersNew X end FE and IO chassis work

We finished setting up the new X end front end machine (still temporarily called c1scx), and attached it to its IO chassis.  We're preparing for a test tomorrow, where we redirect the Limo breakout box to the new front end and IO chassis, so Kiwamu can test getting some green locking channels into his controls model.

We strung a pair of blue fibers from the timing master to the new X end (and labeled them), so we have a timing signal for the IO chassis.  I also labeled the orange fiber Alex had repurposed from the RFM to timing for the new Y end when I noticed he had not actually labelled it at the timing master.

  17039   Wed Jul 27 14:39:04 2022 DeekshaUpdateElectronicsNew and improved PZT TF data from the DFD

Paco and I messed around with the attenuation of the scope and bandwidth of the IF. We also replaced the BNC T's in the circuits with RF splitters. We saw some decent improvements to the data. The data is attached and a diagram of the experiment. [We analytically calculated the impedances to avoid any mismatch taking place]. Working on fitting the data.

We also moved around the wires so that the AG4395 is closer to the PZT.

 

Attachment 1: tf_data.png
tf_data.png
Attachment 2: latest_data.zip
Attachment 3: dfd_-_new.drawio.png
dfd_-_new.drawio.png
  9953   Wed May 14 14:39:31 2014 JenneUpdateSUSNew buttons on IFO_ALIGN screen

It's starting to get a little crowded, but I modified the IFO_ALIGN screen to have new buttons to show the aligned / misaligned state of each optic.  Koji made a good point, and I left the old restore script functional so that if the slider is moved significantly, we can always go back gently to the burt restored value.  I have removed the old misalign function though, since we shouldn't ever be using that again.

Screenshot-Untitled_Window.png

  4014   Mon Dec 6 11:59:41 2010 josephbUpdateCDSNew c1lsc computer moved to lsc rack

Computer moved:

The c1lsc computer has been moved over to the 1Y3 rack, just above the c1lsc IO chassis. 

It will talking to the c1sus computer via a Dolphin PCIe reflected memory card.  The cards have been installed into c1lsc and c1sus this morning.

It will talk to its IO chassis via the usual short IO chassis cable.

 

To Do:

The Dolphin fiber still needs to be strung between c1sus and c1lsc.

The DAQ cable between c1lsc and the DAQ router (which lets the frame builder talk directly with the front ends) also needs t to be strung.

c1lsc needs to be configured to use fb as a boot server, and the fb needs to be configured to handle the c1lsc machine.

  5577   Thu Sep 29 20:37:12 2011 MirkoUpdateComputersNew c1oaf c-code: Breaking in new way

[Mirko, Jenne]

Programmed a new implementation of the LMS in C. Compiles fine in gcc. The full code still kills c1lsc computer. Tried to go through the code uncommenting more and more. Not perfect in reproducability. The attached version should compile and keep c1oaf running, but not actually produce an adaptive filter. At some point the code just keeps c1oaf from starting up. Leaves the c1lsc computer in working order. At some point I got error messages like ..................................................................
CA.Client.Exception...............................................
    Warning: "Identical process variable names on multiple servers"
    Context: "Channel: "C1:OAF-ADAPT_CORR_BS_Name08", Connecting to: 192.168.113.62:50970, Ignored: c1lsc:34533"
    Source File: ../cac.cpp line 1209
    Current Time: Thu Sep 29 2011 19:18:17.219208306
..................................................................
CA.Client.Exception...............................................
    Warning: "Identical process variable names on multiple servers"
    Context: "Channel: "C1:OAF-ADAPT_CORR_BS_Name09", Connecting to: 192.168.113.62:50970, Ignored: c1lsc:34533"
    Source File: ../cac.cpp line 1209
    Current Time: Thu Sep 29 2011 19:18:17.225999915
..................................................................
CA.Client.Exception...............................................
    Warning: "Identical process variable names on multiple servers"
    Context: "Channel: "C1:OAF-ADAPT_CORR_ETMX_SW1R", Connecting to: 192.168.113.62:50970, Ignored: c1lsc:34533"
    Source File: ../cac.cpp line 1209
    Current Time: Thu Sep 29 2011 19:18:17.243037042
..................................................................

This usually indicates that there are multiple carepeater running. Didn't find where that would be. After rebooting c1lsc and c1sus a couple of times everything seems fine.

Attachment 1: ADAPT_XFCODE11-09-29---20-12.c
// LMS algorithm adaptive filtering for the Caltech 40m -- Sept. 2011 by M. Prijatelj

#define nDOF 8
#define nWIT 21
#define nTAPS 1000

void ADAPT_XFCODE(double *in, int inSize, double *out, int outSize) {

//First the DOFs and their switches
//int nDOF=8;
... 136 more lines ...
  5424   Thu Sep 15 20:16:15 2011 jamieUpdateCDSNew c1oaf model installed and running

[Jamie, Jenne, Mirko]

New c1oaf model installed

We have installed the new c1oaf (online adaptive feed-forward) model.  This model is now running on c1lsc.  It's not really doing anything at the moment, but we wanted to get the model running, with all of it's interconnections to the other models.

c1oaf has interconnections to both c1lsc and c1pem via the following routes:

c1lsc ->SHMEM-> c1oaf
c1oaf ->SHMEM-> c1lsc
c1pem ->SHMEM-> c1rfm ->PCIE-> c1oaf

Therefore c1lsc, c1pem, and c1rfm also had to be modified to receive/send the relevant signals.

As always, when adding PCIx senders and receivers, we had to compile all the models multiple times in succession so that the /opt/rtcds/caltech/c1/chans/ipc/C1.ipc would be properly populated with the channel IPC info.

Issues:

There were a couple of issues that came up when we installed and re/started the models:

c1oaf not being registered by frame builder

When the c1oaf model was started, it had no C1:DAQ-FB0_C1OAF_STATUS channel, as it's supposed to.  In the daqd log (/opt/rtcds/caltech/c1/target/fb/logs/daqd.log.19901) I found the following:

Unable to find GDS node 22 system c1oaf in INI files

It turns out this channel is actually created by the frame builder, and it could not find the channel definition file for the new model, so it was failing to create the channels for it.  The frame builder "master" file (/opt/rtcds/caltech/c1/target/fb/master) needs to list the c1oaf daq ini files:

/opt/rtcds/caltech/c1/chans/daq/C1OAF.ini
/opt/rtcds/caltech/c1/target/gds/param/tpchn_c1oaf.par

These were added, and the framebuilder was restarted.  After which the C1:DAQ-FB0_C1OAF_STATUS appeared correctly.

SHMEM errors on c1lsc and c1oaf

This turned out to be because of an oversight in how we wired up the skeleton c1oaf model.  For the moment the c1oaf model has only the PCIx sends and receives.  I had therefore grounded the inputs to the SHMEM parts that were meant to send signals to C1LSC.  However, this made the RCG think that these SHMEM parts were actually receivers, since it's the grounding of the inputs to these parts that actually tells the RCG that the part is a receiver.  I fixed this by adding a filter module to the input of all the senders.

Once this was all fixed, the models were recompiled, installed, and restarted, and everything came up fine.

All model changes were of course committed to the cds_user_apps svn as well.

  15236   Fri Feb 28 19:37:18 2020 gautamUpdatePSLNew c1psl installed
  1. The new c1psl Acromag crate is now interfaced to the Eurocrate electronics in 1X1 (formerly VME c1psl) and 1X2 (formerly c1iool0).
  2. The PMC and IMC can be locked. We will investigate stability / duty cycle over the weekend.
  3. There were a few issues with the wiring - specifically, the worng kind of Acromag BIO unit (sourcing, whereas we want sinking) was used for the FSS board switches. Once Jordan fixed this issue, the IMC could be locked.
  4. I began to do the detailed tests of the IMC Servo card channels - there may be some issues with the boost stages, but I ran out of time yesterday, so tbc Monday.

On Monday, we will remove the old c1psl and c1iool0 machines from the electronics rack and install the Acromag crate in a more permanent way. We will also clean up some of the old cabling and cross connects, althoug the situation seems so complicated (some cross connects are also used by the rtcds c1ioo expansion chassis) that I am inclined not to remove any cables.

The area around 1X1/1X2 has a lot of dangling cables and general detritus. Be careful if you are walking around there. We will clean up on monday.

  15114   Tue Jan 7 18:51:51 2020 JonUpdatePSLNew c1psl server assembled

I've assembled a new SuperMicro rackmount machine to replace c1psl. It is currently set up on the electronics bench.

  • OS: Debian 10.2
  • Hostname: c1psl1 (will become c1psl after installation)
  • IP: 192.168.113.54 (registered in the martian DNS)
  • Network drive mount point set up (/cvs/cds), which provides all the EPICS executables.
  14581   Fri Apr 26 19:35:16 2019 JonUpdateSUSNew c1susaux installed, passed first round of scripted testing

[Jon, Gautam]

Today we installed the c1susaux Acromag chassis and controller computer in the 1X4 rack. As noted in 14580 the prototype Acromag chassis had to first be removed to make room in the rack. The signal feedthroughs were connected to the eurocrates by 10' DB-37 cables via adapters to 96-pin DIN.

Once installed, we ran a scripted set of suspension actuation tests using PyIFOTest. BS, PRM, SRM, MC1, MC2, and MC3 all passed these tests. We were unable to test ITMX and ITMY because both appear to be stuck. Gautam will shake them loose on Monday.

Although the new c1susaux is now mounted in the rack, there is more that needs to be done to make the installation permanent:

  • New 15V and 24V power cables with standard LIGO connectors need to be run from the Sorensenn supplies in 1X5. The chassis is currently powered by bench supplies sitting on a cart behind the rack.
  • All 24 new DB-37 signal cables need to be labeled.
  • New 96-pin DIN connectors need to be put on two ribbon cables (1Y5_80 B, 1Y5_81) in the 1X4 rack. We had to break these connectors to remove them from the back of the eurcrates.
  • General cleanup of any cables, etc. left around the rack. We cleaned up most things this evening.
  • Rename the host computer c1susaux2 --> c1susaux, and update the DNS lookup tables on chiara.

On Monday we plan to continue with additional scripted tests of the suspensions.


gautam - some more notes:

  • Backplane connectors for the SUS PD whitening boards, which now only serve the purpose of carrying the fast BIO signals used for switching the whitening, were moved from the P1 connector to P2 connector for MC1, MC2, MC3, ITMX, ITMY, BS and PRM.
  • In the process, the connectors for BS and PRM were detatched from the ribbon cable (there wasn't any good way to unseat the connector from the shell that I know of). These will have to be repaired by Chub, and the signal integrity will have to be checked (as they have to be for the connectors that are allegedly intact).
  • While we were doing the wiring, I disconnected the outputs of the coil driver board going to the satellite box (front panel DB15 connector on D010001). These were restored after our work for the testing phase.
  • The backplane cables to the eurocrate housing the coil driver boards were also disconnected. They are currently just dangling, but we will have to clean it up if the new crate is performing alright.
  • In general the cable routing cleanliness has to be checked and approved by Chub or someone else qualified. In particular, the power leads to the eurocrate are in the way of the DIN96-DB37 adaptor board of Johannes' design, particularly on the SUS PD eurocrate.
  • Tapping new power rails for the Acromag chassis will have to be done carefully. Ideally we shouldn't have to turn off the Sorensens.
  • There are some software issues we encountered today connected with the networking that have to be understood and addressed in a permanent way.
  • Sooner rather than later, we want to reconnect the Acromag crate that was monitoring the PSL channels, particularly given the NPRO's recent flakiness.
  • The NPRO was turned back on (following the same procedure of slowly dialing up the injection current). Primary motivation to see if the mode cleaner cavity could be locked with the new SUS electronics. Looks like it could. I'm leaving it on over the weekend...
Attachment 1: IMG_3254.jpg
IMG_3254.jpg
Attachment 2: IMG_3256.jpg
IMG_3256.jpg
  10513   Wed Sep 17 13:41:00 2014 JenneUpdateSUSNew calibrated channels for test QPD

Steve asked about calibrating the QPD, so I set up some new epics records so that we can have calibrated versions of the QPD output.

The new channels are called C1:ASC-TESTQPD_Y_Calc and C1:ASC-TESTQPD_X_Calc for pitch and yaw, respectively.


Details:

 * I modified /cvs/cds/caltech/target/c1iscaux/QPD.db to add 2 new channels.  Since we are currently plugged into the IPPOS channels, I didn't want to modify the units of IPPOS, which is why I created new channels.  The new channels are just the IPPOS normalized X and Y channels, multiplied by a calibration factor.  Steve has already done a rough calibration for his setup, so I used those numbers (0.15 urad/ct for pitch and 0.25 urad/ct for yaw). 

* Rebooted c1iscaux.  This required adding it to chiara's /etc/hosts file.

* Added the channels to the /opt/rtcds/caltech/c1/chans/daq/C0EDCU.ini file so that the channels would appear in dataviewer.

* Restarted the framebuilder daqd process.


How to modify the calibration:

1) On a control room workstation, cd /cvs/cds/caltech/target/c1iscaux to get to the right folder.  (Note that this is still in the old cvs/cds place, *not* the new opt/rtcds place)

2)  open the epics database file by typing sudo emacs QPD.db.  Since this is a protected file, you need to use the "sudo" command, and will have to type in the usual controls password. 

3)  Find the "records" that have the channel names C1:ASC-TESTQPD_Y_Calc and C1:ASC-TESTQPD_X_Calc by scrolling down.  (Right now they are on lines #550 and #561 of the text file).

4) For each of these 2 records, modify the calibration in the line that says something like field(CALC,"(A*0.25)").  In this example, the current calibration is 0.25 urad/oldCount.  Change the number to the new value.

5) Save the file.  If you followed the procedure in step2 and used the emacs program and you can't use the mouse, do the following:  Hold down the "ctrl" key.  Keeping ctrl pushed down, push the "x" key.  Still keeping ctrl pushed down, push the "s" key. 

6) Close the file.  If you followed the procedure in step2 and used the emacs program and you can't use the mouse, do the following:  Hold down the "ctrl" key.  Keeping ctrl pushed down, push the "x" key.  Still keeping ctrl pushed down, push the "c" key. 

7) Reboot the slow computer called c1iscaux.  You should be able to do this remotely by typing telnet c1iscaux, and then typing reboot.  If that doesn't work, you may have to go into the IFO room and power cycle the crate by turning the key.  This computer is in 1Y3, near the bottom.

8) Check that you can see your channels - you should be finished now!

For steps 3 and 4, here is a screenshot of the lines in the text file:

NewQPDcalibratedChans.png

  13902   Thu May 31 15:36:59 2018 gautamUpdateGeneralNew camera channels

Jon informed me that there are some EPICS channels that JoeB's camera server code looks for that don't exist. I thought Jigyasa and I had added everything last year but turned out not to be the case. I followed my instructions from here, did the trick. While cleaning up, I also re-named the "*MC1" channels to "*ETMX", since that's where the camera now resides. New channels are:

C1: CAM-ETMX_ARCHIVE_INTERVAL (Archival interval in minutes)
C1: CAM-ETMX_ARCHIVE_RESET (Reset Archival interval in minutes)

C1: CAM-ETMX_CONFIG_FILE (Config file)
 

  3399   Wed Aug 11 13:28:44 2010 josephbUpdateCDSNew cdsIPCx parts, old part breaks models

While working on a test stand at LLO, I've discovered that there's a new update to the Real Time Code Generator that breaks virtually all of our current models.

Previously, we've been using the cdsIPCx part as a flexible link between models, and could be set to RFM (reflected memory), SHMEM (shared memory on the local computer), or PCIE (pci express or dolphin I think) depending on what was written in the IPC file (found in /cvs/cds/caltech/chans/ipc/C1.ipc).

Recently, three new parts were added called cdsIPCx_SHMEM, cdsIPCx_RFM, cdsIPCx_PCIE, and the previous cdsIPCx broken.  The cdsIPCx_***** has to match the type written in the IPC file or else it errors out with a rather unhelpful error message which doesn't tell you which part/line is in conflict...

i.e.

***ERROR: IPCx type mis-match: I vs. ISHM
make: *** [g1lsc] Error 255

In anycase, when using a current checkout (updated or checked out after ~July 30th), all cdsIPCx blocks in the simulink models needs to be changed to the approriate type.  I'm trying to get a new CDS_PARTS.mdl file I updated into the svn, but for now you can just open up the model file directly in the /advLigoRTS/src/epics/simLink/lib directory and copy it in from there (i.e. cdsIPCx_SHMEM.mdl) to your model file.  I'm also trying to get the feCodeGen.pl file changed so the error message actually tells you what channel/part is mismatching so you don't have to guess.

An easy way to modify a file for all shared memory connections without doing a ton of cutting, pasting and renaming is:

sed -i 's/"cdsIPCx"/"cdsIPCx_SHMEM"/g' file_name_here.mdl

  2143   Mon Oct 26 17:45:34 2009 JenneUpdateAdaptive FilteringNew changes to the OAF fe code

[Alex, Jenne, Sanjit]

Alex came to the 40m today, and did several awesome things in OAF-land.

We discovered that there is, in fact, an ADC board connected to the ASS machine.  The tricky bit is that it only has a ribbon cable connector, so before we can use this ADC, we need to figure out how to make a breakout board/cable/something to connect the seismometer/accelerometer/microphone BNCs to this little board.  This is the same little board that connects the timing slave to the ASS machine.  For good or for ill, the timing slave is connected to this board via clip-doodles.  Potentially we can connect an ADC tester board to this board, and go from seismometer BNCs to clipdoodles to the tester board, but I'm not in love with the idea of utilizing clipdoodles as a semi-permanent solution until the upgrade.  I emailed Ben to see if he has a better idea, or (better yet) some spare hardware now that's the same as we'll use after the upgrade.  If we can use this ADC, it may solve our timing problem which is caused by the 110B ADC used by the PEM computer. Alex showed Sanjit and I how to connect the ASS's ADC card to the simulink diagram, when we're ready for that.

We also poked around in the code, and it seems that we can now save and restore OAF coefficients at will.  I added buttons to the OAF (ASS) screen, and Alex made it so the OAF coefficients are saved in RFM shared memory whenever you click the "save coeffs" button, and are restored when you click the "restore coeffs" button.  The buttons are the same as the 'Reset' button which has been there for a long time, so they seem to maybe have a similar problem in that you have to hold the button for a while in order for the code to realize that the button has been depressed.  We couldn't fix this easily, because it looks like our SimuLink cds stuff is a little out of date.  Some day (before/when Joe and Peter make new screens for the new 40m), we need to update these things.  Alex was concerned that it might take a while to do this, if the update broke some of the blocks that we're currently using.  Also, Sanjit and I now need to check that the coefficient-saving is going as planned.  When I have DTT open, and the OAF running, I see a certain shape to the signal which is sent to MC1 to correct for the seismic motion.  This shape includes at least several peaks at resonant frequencies that exist in our stacks/suspensions.  I can then save the coefficients, reset the active filter, and then restore the coefficients.  When I do this while watching DTT, it seems as though the general shape of the filter is restored, but none of the detailed features are.  The reason for this is still under investigation. 

The code-modifications involved a few iterations of 'remaking the ass'.

  3124   Sat Jun 26 20:16:44 2010 josephbUpdateCDSNew checkout of RCG from SVN and changes made

ORPHAN ENTRY FOUND ON ROSALBA:::::::::::::::::::::::::::::::::::::::::::::::::::>>>>>>>>>>>>>>>>>>>>>>>>>>>>>


We did svn update.  Then Alex realized he missed adding some files, so added them to the svn, and then we checked out again.

 

We rebuilt awg, fb, nds.

We reloaded service xinet.d, after editing /etc/xinetd.d/chnconf.  We changes all the tpchn_c1 to tpchn_c1SYS

 

There's a new naming scheme for the model files.  They start with the site name.  So, lsc becomes c1lsc. 

 

On any machine you want code running, make a symbolic link to /cvs/cds/rtcds/ in /opt/

  7269   Fri Aug 24 11:46:59 2012 MashaUpdatePEMNew classification weights

I recently realized that I may have over-trained my classification neural network and used too many parameters, so that my weight vectors are too fine-tuned to my particular data set and do not generalize well. I lowered the number of hidden neurons in the network to 15, and the number of epochs to 25000, and regularized based on the deltas (the gradient). Here is the most recent learning curve:

 

current_learning_curve.png

 

 

The old weights and code are saved in the c1pem directory in the file "classify_seismic_20neurons.c", while the current 15 neuron network is saved as "classify_seismic.c". I'll monitor the performance of this current network throughout the day, and decide which one we should keep.

  809   Thu Aug 7 11:54:26 2008 josephbConfigurationCamerasNew code + gstreamer allows for easy saving and compression of images
Modified the CamSnap code to output the image data stream to standard out. This can then be piped into a gstreamer plugin and then be used to save, encode, transmit, receive, slice, dice and or mangle video (or virtually any type of data stream).

The gstreamer webpage can be found at: http://www.gstreamer.net/

Under documentation you can find a list off all available plug-ins. Some good, some bad, some ugly.

Running the following command on Mafalda (via ssh -X mafalda) or Rosalba while in /cvs/cds/caltech/target/Prosilica/40mCode/SnapCode/

CamSnap -F 'Mono8' -c 44058 -E 15000 -X 0 -Y 0 -H 480 -W 752 -l 0 -m 1000 | gst-launch-0.10 fdsrc fd=0 blocksize=360960 ! video/x-raw-gray, height=480, width=752, bpp=8,depth=8,framerate=1/1 ! ffmpegcolorspace ! ximagesink

This command will create a window which displays what the camera with UID 44058 is looking at. It will display 1000 images, then quit. (You can switch the -m 100 to -i to just have it continue until the process is stopped).

You can also encode the data into compressed format and save it in a media file. The following command line will encode the images into an ogg media file (.ogm), which can be played with the totem viewer (available on Rosalba or almost any machine running Ubuntu or Centos) or any other viewer capable of handling ogm files. By switching the plugins you can generate other formats as well.

The compression is good, putting 300 images normally about 500K individually uncompressed to about 580K as a single file.

The following command line was used to generate the attached video file:

CamSnap -F 'Mono8' -c 44058 -E 5000 -X 0 -Y 0 -H 480 -W 752 -l 0 -m 300 | gst-launch-0.10 fdsrc fd=0 blocksize=360960 ! video/x-raw-gray, height=480, width=752, bpp=8,depth=8,framerate=30/1 ! ffmpegcolorspace ! theoraenc ! oggmux ! filesink location="./testVideo.ogm"

Currently looking into plugins which allow you to pull individual frames out of a video file and display or save them in a variety of formats. This would allow us to save long term images in compressed video format, and then pull out individual frames as needed.

Also need to look into how to "T" the streams, so one can be displaying while another encodes and saves.
Attachment 1: testVideo.ogm
  812   Fri Aug 8 09:54:10 2008 ranaUpdateCamerasNew code + gstreamer allows for easy saving and compression of images

Quote:
Modified the CamSnap code to output the image data stream to standard out. This can then be piped into a gstreamer plugin and then be used


Didn't work; Prosilica has only 1 "l". Even so, sshing from op440m to mafalda, I got this:
mafalda:SnapCode>CamSnap -F 'Mono8' -c 44058 -E 5000 -X 0 -Y 0 -H 480 -W 752 -l 0 -m 300 | gst-launch-0.10 fdsrc fd=0 blocksize=360960 ! video/x-raw
-gray, height=480, width=752, bpp=8,depth=8,framerate=30/1 ! ffmpegcolorspace ! theoraenc ! oggmux ! filesink location="./testVideo.ogm"
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...

** (gst-launch-0.10:27121): WARNING **: Size 60 is not a multiple of unit size 360960
Caught SIGSEGV accessing address 0x487c
ERROR: from element /pipeline0/ffmpegcsp0: subclass did not specify output size
Additional debug info:
gstbasetransform.c(1495): gst_base_transform_handle_buffer (): /pipeline0/ffmpegcsp0:
subclass did not specify output size
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7deddae in __lll_mutex_lock_wait ()
#2  0xb7de9aac in _L_mutex_lock_51 () from /lib/tls/i686/cmov/libpthread.so.0
#3  0xb7de949d in pthread_mutex_lock ()
#4  0xb7e452e0 in g_static_rec_mutex_lock () from /usr/lib/libglib-2.0.so.0
#5  0xb7f1fa08 in ?? () from /usr/lib/libgstreamer-0.10.so.0
#6  0x080c1220 in ?? ()
#7  0x00000001 in ?? ()
#8  0x0809586c in ?? ()
#9  0x00000001 in ?? ()
#10 0x08095868 in ?? ()
#11 0xb7f7a2a8 in ?? () from /usr/lib/libgstreamer-0.10.so.0
#12 0xb7e8da80 in ?? () from /usr/lib/libglib-2.0.so.0
#13 0xb7f7a2a8 in ?? () from /usr/lib/libgstreamer-0.10.so.0
#14 0xb7f7a2a8 in ?? () from /usr/lib/libgstreamer-0.10.so.0
#15 0x00000000 in ?? ()
Spinning.  Please run 'gdb gst-launch 27121' to continue debugging, Ctrl-C to quit, or Ctrl-\ to dump core.
Caught interrupt -- 
  1261   Fri Jan 30 17:30:31 2009 Alberto, JosephbConfigurationComputersNew computer Ottavia set up
Alberto, Joseph,

Today we installed the computer that some time ago Joe bought for his GigE cameras. It was baptized "OTTAVIA".

Ottavia is black, weighs about 20 lbs and it's all her sister, Allegra (who also pays for bad taste in picking names). She runs an Intel Core 2 Quad and has 4GB of RAM. We expect much from her.

Some typical post-natal operations were necessary.

1) Editing of the user ID
  • By means of the command "./usermod -u 1001 controls" we set the user ID of the user controls to 1001, as it is supposed to be.

2) Connection to the Martian network
  • Ottavia was given IP address 131.215.113.097 by editing the file /etc/sysconfig/networ-scripts/ifcfg-eth0 (we also edited the netmask and the gateway address as in the Wiki)
  • In linux1, which serves as name server, in the directory /var/named/chroot/var/named, we modified both the IP-to-name and name-to-IP register files 131.215.113.in-addr.arpa.zone and 131.215.11in-addr.martian.zone.
  • We set the file /etc/resolv.conf so that the OS knows who is the name server.

3) Mounting of the /cvs/cds path
  • We created locally the empty directories /cvs/cds
  • We edited the files /etc/fstab adding the line "linux1:/home/cds /cvs/cds nfs rw,bg,soft 0 0"
  • We implemented the common variables of the controls environment by sourcing the cshrc.40m: in the file /home/controls/.cshrc we added the two lines "source /cvs/cds/caltech/cshrc.40m" and "setenv PATH ${PATH}:/cvs/cds/caltech/apps/linux64/matlab/bin/"
  2967   Fri May 21 14:31:46 2010 josephb,alexUpdateCDSNew computer and IO chassis working in 1X4

Alex brought over a ADC, DAC, and PCIe card which goes into the computer and talk to the IO chassis.  We tried installing the new "small" IO chassis in 1X4, but initially it couldn't find the ADC/DAC boards, just the Contec Binary out board.

We tried several different configurations (different computer, different IO chassis, the megatron chassis, the megatron IO chassis with new cards, a new IO chassis with megatron cards.

The two things were concluded once we got a new IO chassis talking with the new computer. 

1) Its possible one of the slots is in the IO chassis as we didn't see the ADC until we moved it to a different slot in the new chassis

2) The card that Alex had brought over to put in the computer doesn't behave well with these IO chassis.  He went back to downs to try and figure out what it is, and test it with the chassis over there.

Currently, Megatron's IO chassis is sitting on a table behind racks 1Y5 and 1Y6, along with the new "large" IO chassis.  Megatron's PCIe card for talking to the IO chassis was moved to the computer in 1X4.  The computer in 1X4 is currently being called c1iscex with IP 192.168.113.80. 

  12831   Wed Feb 15 22:16:05 2017 Max IsiUpdateSummary PagesNew condor_q format

There has been a change in the default format for the output of the condor_q command at CIT clusters. This could be problematic for the summary page status monitor, so I have disabled the default behavior in favor of the old one. Specifically, I ran the following commands from the 40m shared account: mkdir -p ~/.condor echo "CONDOR_Q_DASH_BATCH_IS_DEFAULT=False" >> ~/.condor/user_config This should have no effect on the pages themselves.

  15960   Wed Mar 24 22:54:49 2021 gautamUpdateLSCNew day, new problems

I thought I'd get started on some of the tests tonight. But I found that this problem had resurfaced. I don't know what's so special about the REFL55 photodiode - as far as I can tell, other photodiodes at the REFL port are running with comparable light incident on it, similar flat whitening gain, etc etc. The whitening electronics are known to be horrible because they use the quad LT1125 - but why is only this channel problematic? To describe the problem in detail:

  • I had checked the entire chain by putting an AM field on the REFL 55 photodiode, and corroborating the pk-to-pk (counts) value measured in CDS with the "nominal" setting of +18dB flat whitening gain against the voltage measured by a "reference" PD, in this case a fiber coupled NF1611.
  • In the above test, I confirmed that the measured signal was consistent with the value reported by the NF1611.
  • So, at least on Friday, the entire chain worked just fine. The PRMI PDH fringes were ~6000cts-pp in this condition.
  • Today, I found that while trying to acquire PRMI lock, the PDH fringes witnessed in REFL55 were saturating the ADC. I lowered the whitening gain to 0 dB (so a factor of 8). Then the PDH fringes were ~20,000cts-pp. So, overall, the gain of the chain seems to have gone up by a factor of ~25. 
  • Given my NF1611 based test, the part of the chain I am most suspicious of is the whitening filter. But I don't have a good mechanism that explains this observation. Can't be as simple as the input impedance of the LT1125 being lowered due to internal saturations, because that would have the opposite effect, we would measure a tiny signal instead of a huge one

I request Koji to look into this, time permitting, tomorrow. In slightly longer term, we cannot run the IFO like this - the frequency of occurrence is much too high and the "fix" seems random to me, why should sweeping the whitening gain fix the problem? There was some suggestion of cutting the PCB trace and putting a resistor to limit the current draw on the preceeding stage, but this PCB is ancient and I believe some traces are buried in internal layers. At the same time, I am guessing it's too much work to completely replace the whitening electronics with the aLIGO style units. Anyone have any bright ideas?


Anyway, I managed to lock the PRMI (ETMs misaligned) using REFL165I/Q. Then, instead of using the BS as the MICH actuator, I used the two ITMs (equal magnitude, opposite sign in the LSC output matrix).

  • The digital demod phase in this config is different from what is used when the arm cavities are in play (under ALS control). Probably the difference is telling us something about the reflectivity of the arm cavity for various sideband fields, from which we can extract some useful info about the arm cavity (length, losses etc). But that's not the focus here - the correct digital demod phase was 11 degrees. See Attachment #1 for the sensing matrix. I've annotated it with some remarks.
  • The signals appear much more orthogonal when actuating on the ITMs. However, I was still only able to null the MICH line sensed in the PRCL sensor to a ratio of 1/5 (while looking at peaks on DTT). I was unable to do better by fine tuning either the digital demod phase, or the relative actuation strength on each ITM
  • The PRCL loop had a UGF of ~120 Hz, MICH loop ~60 Hz.
  • With the PRMI locked in this config, I tried to measure the appropriate loop gain and sign if I were to use the REFL55 photodiode instead of REFL165 - but I didn't have any luck. Unsurprising given the known electronics issues I guess...

I didn't get around to running any of the other tests tonight, will continue tomorrow.


Update Mar 26: Attachments #2 and #3 show that there is clearly something wrong with the whitening electronics associated with REFL55 channels - with the PSL shutter closed (so the only "signal" being digitized should be the electronics noise at the input of the whitening stage), the I and Q channels don't show similar profiles, and moreover, are not consistent (the two screenshots are from two separate sweeps). I don't know what to make of the parts of the sweep that don't show the expected "steps". Until ndscope gets a log-scaled y-axis option, we have to live with the poor visualization of the gain steps which are dB (rather than linearly) spaced. For this particular case, StripTool isn't an option either because the Q channel as a negative offset, and I opted agains futzing with the cabling at 1Y2 to give a small fixed positive voltage instead. I will emphasize that on Friday, this problem was not present, because the gain balance of the I and Q channels was good to within 1dB.

Attachment 1: PRMI3f_noArmssensMat.pdf
PRMI3f_noArmssensMat.pdf
Attachment 2: REFL55_whtGainStepping.png
REFL55_whtGainStepping.png
Attachment 3: REFL55_whtGainStepping2.png
REFL55_whtGainStepping2.png
  15714   Mon Dec 7 14:32:02 2020 gautamUpdateLSCNew demod phases for POX/POY locking

In favor of keeping the same servo gains, I tuned the digital demod phases for the POX and POY photodiode signals to put as much of the PDH error signal in the _I quadrature as possible. The changes are summarized below:

POX / POY demod phases
PD Old demod phase [deg] New demod phase [deg]
POX11 79.5 -75.5
POY11 -106.0 116.0

The old locking settings seem to work fine again. This setting isn't set by the ifoconfigure scripts when they do the burt restore - do we want it to be?

Attachments #1 and #2 show some spectra and TFs for the POX/POY loops. In Attachment #2, the reference traces are from the past, while the live traces are from today. In fact, to have the same UGF as the reference traces (from ~1 year ago), I had to also raise the digital servo loop gain by ~20%. Not sure if this can be put down to a lower modulation depth - at least, at the output on the freq ref box, I measured the same output power (at the 0dB variable attenuator gain setting we nominally run in) before and after the changes. But I haven't done an optical measurement of the modulation depth yet. There is also a hint of lesser phase available at ~100 Hz now compared to a year ago.

Attachment 1: POX_POY_OLTF.pdf
POX_POY_OLTF.pdf
Attachment 2: POX_POY_spectra.pdf
POX_POY_spectra.pdf
  16925   Thu Jun 16 18:30:07 2022 AnchalUpdateSUSNew diagonalized input matrices applied

I used the same fre swing data to diagnolize input matrices of following optics:
MC1, MC2, MC3

BS ETMX ETMY

AS1 AS4 SR2 PR2 PR3

For all these optics, the new input matrices worked well. Next step should be to take the local damping open loop transfer functions and standardize the loops to same UGF.


What didn't work:

  • The calculated input matrix for ITMX differed from existing matrix too much, including overall sign of rows POS and PIT. Even after correcting those signs, I was not able to get a good damping loop configuration. So I have committed the new matrix to the repo but have not implement it. More close analysis or another test might be required for this optic.
  • LO1, LO2, and ITMY were not analysed because their free swing test was not valid. LO1 and ITMY had non-working coils and LO2 was stuck during the test. We'll take another free swing test for these three optics (and possible ITMX) in near time.

All diagonalization results are present in https://git.ligo.org/40m/scripts/-/tree/main/SUS/InMatCalc

For looking at the results at this point, go to this commit: https://git.ligo.org/40m/scripts/-/tree/7ef6a47d1b2051a0732f46477624a9e625737fe8

Attachment 1: SUSInpMatDiag_MC1_MC2_MC3_BS_IMTX_ETMX_ETMY_AS1_AS4_SR2_PR2_PR3.pdf
SUSInpMatDiag_MC1_MC2_MC3_BS_IMTX_ETMX_ETMY_AS1_AS4_SR2_PR2_PR3.pdf SUSInpMatDiag_MC1_MC2_MC3_BS_IMTX_ETMX_ETMY_AS1_AS4_SR2_PR2_PR3.pdf SUSInpMatDiag_MC1_MC2_MC3_BS_IMTX_ETMX_ETMY_AS1_AS4_SR2_PR2_PR3.pdf SUSInpMatDiag_MC1_MC2_MC3_BS_IMTX_ETMX_ETMY_AS1_AS4_SR2_PR2_PR3.pdf SUSInpMatDiag_MC1_MC2_MC3_BS_IMTX_ETMX_ETMY_AS1_AS4_SR2_PR2_PR3.pdf SUSInpMatDiag_MC1_MC2_MC3_BS_IMTX_ETMX_ETMY_AS1_AS4_SR2_PR2_PR3.pdf SUSInpMatDiag_MC1_MC2_MC3_BS_IMTX_ETMX_ETMY_AS1_AS4_SR2_PR2_PR3.pdf SUSInpMatDiag_MC1_MC2_MC3_BS_IMTX_ETMX_ETMY_AS1_AS4_SR2_PR2_PR3.pdf SUSInpMatDiag_MC1_MC2_MC3_BS_IMTX_ETMX_ETMY_AS1_AS4_SR2_PR2_PR3.pdf SUSInpMatDiag_MC1_MC2_MC3_BS_IMTX_ETMX_ETMY_AS1_AS4_SR2_PR2_PR3.pdf SUSInpMatDiag_MC1_MC2_MC3_BS_IMTX_ETMX_ETMY_AS1_AS4_SR2_PR2_PR3.pdf SUSInpMatDiag_MC1_MC2_MC3_BS_IMTX_ETMX_ETMY_AS1_AS4_SR2_PR2_PR3.pdf
  4735   Tue May 17 22:50:00 2011 JamieConfigurationLSCNew digital lockin added to LSC model/screen

I added a lockin to the LSC model, and added it's corresponding control to the LSC screen.  Here's is what I added to the LSC model:

lsc-mdl-lockin.png

On the left are the froms from the normalized RF PD outputs. Those go into a matrix, whose single row goes into the lockin signal input. The clock output from the lockin goes into the LSC output matrix (last row).

Here is what I added to the LSC master screen:

lsc-screen-lockin.png

I also modified the lockin overview screen:

lsc-lockin-screen.png

I think this new screen looks a lot cleaner.  Maybe we could start using this one as a template for lockin screens.

  4743   Wed May 18 22:11:31 2011 ranaConfigurationLSCNew digital lockin added to LSC model/screen

Untitled.png

 This is OK....but, the input matrix should come from the same place as the regular input matrix: i.e. it should be just another row like CARM, DARM, etc. rather than have its own screen.

Also, I think a nice mod to all the matrices would be if the ORANGE triangle was only visible when there's a signal flowing through it.

  4766   Wed May 25 20:12:55 2011 JamieConfigurationLSCNew digital lockin added to LSC model/screen

Quote:

This is OK....but, the input matrix should come from the same place as the regular input matrix: i.e. it should be just another row like CARM, DARM, etc. rather than have its own screen.

 You're absolutely right.  That was a brain-fart oversight.  I fixed the model so that the input from the lockin comes from another output row in the RFPD input matrix.  I then fixed the C1LSC medm screen accordingly:

lsc-lockin-adl.png

This is obviously much simpler and more straight-forward.

A future improvement would be to modify the DCPD input matrix to be able to route those signals to the lockin as well.  This is actually currently possible since the DCPD input matrix is just a subset of the full input matrix, but it's not available via medm yet.

  4767   Thu May 26 17:10:21 2011 JamieConfigurationLSCNew digital lockin added to LSC model/screen

Quote:

A future improvement would be to modify the DCPD input matrix to be able to route those signals to the lockin as well.  This is actually currently possible since the DCPD input matrix is just a subset of the full input matrix, but it's not available via medm yet.

 I went ahead and added the lockin output to the DCPD input matrix.

 

  16252   Wed Jul 21 14:50:23 2021 KojiUpdateSUSNew electronics

Received:

Jun 29, 2021 BIO I/F 6 units
Jul 19, 2021 PZT Drivers x2 / QPD Transimedance amp x2

 

Attachment 1: P_20210629_183950.jpeg
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Attachment 2: P_20210719_135938.jpeg
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  16281   Tue Aug 17 04:30:35 2021 KojiUpdateSUSNew electronics

Received:

Aug 17, 2021 2x ISC Whitening

Delivered 2x Sat Amp board to Todd

 

Attachment 1: P_20210816_234136.jpg
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Attachment 2: P_20210816_235106.jpg
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Attachment 3: P_20210816_234220.jpg
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  16436   Wed Oct 27 19:34:52 2021 KojiSummaryElectronicsNew electronics racks

1. The rack we cleaned today (came from West Bridge) will be placed between 1X3 and 1X4, right next to 1X4 (after removing the plastic boxes). (Attachment 1)
For easier work at the side of the 1X4, the side panel of the 1X4 should be removed before placing the new rack. Note that this rack is imperial and has 10-32 threads

2. In terms of the other rack for the Y arm, we found the rack in the storage is quite dirty. Anchal pointed out that we have a few racks standing along the Y arm (as the storage of the old VME/Euro card electronics) (Attachments 2/3)
They are not too dirty and also doing nothing there. Let's vacate one of them (the one right next to the optics preparation table). Use this space as a new storage area placing a wire shelving rack for something.

BTW, I thought it is good to have the rack at the vertex side of 1Y1 (as 1Y0?), but the floor has "KEEP OUT" marking. I have no idea why we have this marking. Is this for crane operation??? Does any one know?

Attachment 1: P_20211027_180737.jpg
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Attachment 2: P_20211027_180443.jpg
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  16149   Fri May 21 00:05:45 2021 KojiUpdateSUSNew electronics: Sat Amp / Coil Drivers

11 new Satellite Amps were picked up from Downs. 7 more are coming from there. I have one spare unit I made. 1 sat amp has already been used at MC1.

We had 8 HAM-A coil drivers delivered from the assembling company. We also have two coil drivers delivered from Downs (Anchal tested)

Attachment 1: F3CDEF8D-4B1E-42CF-8EFC-EA1278C128EB_1_105_c.jpeg
F3CDEF8D-4B1E-42CF-8EFC-EA1278C128EB_1_105_c.jpeg
  16212   Thu Jun 17 22:25:38 2021 KojiUpdateSUSNew electronics: Sat Amp / Coil Drivers

It is a belated report: We received 5 more sat amps on June 4th. (I said 7 more but it was 6 more) So we still have one more sat amp coming from Todd.

- 1 already delivered long ago
- 8 received from Todd -> DeLeone -> Chub. They are in the lab.
- 11 units on May 21st
- 5 units on Jun 4th
Total 1+8+11+5 = 25
1 more unit is coming

 

Quote:

11 new Satellite Amps were picked up from Downs. 7 more are coming from there. I have one spare unit I made. 1 sat amp has already been used at MC1.

We had 8 HAM-A coil drivers delivered from the assembling company. We also have two coil drivers delivered from Downs (Anchal tested)

 

Attachment 1: P_20210604_231028.jpeg
P_20210604_231028.jpeg
  5815   Fri Nov 4 21:15:38 2011 KatrinUpdateGreen LockingNew fiber coupler (YARM)

63% coupling efficiency into the new fiber collimator (Thorlabs XXXX) and the blue fiber.This should be sufficient for a beat measurement with the PSL laser.

I think the coupling efficiency is not too bad with having no mode matching lenses and no adjustable collimator lens.

 

252mW in front of the fiber

159 mW fiber output

  15549   Sat Aug 29 22:46:29 2020 gautamUpdateBHDNew homodyne-phase control electronics

Summary:

The electronics chain used to drive the three elements of the PI PZT on which a mirror is mounted with the intention of controlling the LO phase has been changed, to now use the Trek Mode603 power amplifier instead of the OMC high voltage driver. Attachment #1 shows the new configuration.

Details:

The text of Attachment #1 contains most of the details. The main requirement was to map the DAC output voltage range, to something appropriate for the Trek amplifier. The latter applies a 50V/V gain to the signal received on its input pin, and also provides a voltage monitor output which I hooked up to an ADC channel in c1ioo. The gain of the interfacing electronics was chosen to map the full output range of the DAC (-5 to +5 V for a single-ended receiving config in which one pin is always grounded) to 0-2.5 V at the input of the Trek amplifier, so that the effective high voltage drive range is 0-125 V. I don't know what the damage threshold is for the PI PZT, maybe we can go higher. The only recommendation given in the Trek manual is to not exceed +/-12 V on the input jack, so I have configured D2000396 to have a supply voltage of 11.5 V, so that in the event of electronics failure, we still don't exceed this number.

On the electronics bench, I tested the drive chain, and also measured the transfer function, see Attachment #2. Seems reasonable (the Trek amplifier was driving a 3uF capacitive load used to protect the SR785 measurement device from any high voltage, hence the roll-off). The gain of D2000396 was changed from 1/8 to 1/4 after I realized that the DAC full range is only +/- 5 V when the receiving device is single-ended at both input and output. Maybe the next iteration of this curcuit should have differential sending, to preserve the range.

Testing:

To test the chain, I used the single bounce beam from the ITM, and interfered it with the LO. Clear fringing due to the seismic motion of the ITM (and also LO phase noise) is visible. In this configuration, I drove the PZT mirror in the LO path at a higher frequency, hoping to see the phase modulation in the DCPD output. However, I saw no signal, even when driving the PZT with 50% of the full DAC range. The voltage monitor ADC channel is reporting that the voltage is faithfully being sent to the PZTs, and I measured the capacitance of the PZTs (looked okay), so not sure what is going on here. Needs more investigation.

Update Aug 30 5pm: Turns out the problem here was a flaky elbow connector I used to pipe the high voltage to the PI PZT, it had some kind of flaky contact in it which meant the HV wasn't actually making it to the PZT. I rectified this and was immediately able to see the signal. Played around with the dark fringe Michelson for a while, trying to lock the homodyne phase by generating a dither line, but had no success with a simple loop shape. Probably needs more tuning of the servo shape (some boosts, notches etc) and also the dither/demod settings themselves (frequency, amplitude, post mixer LPF etc). At least the setup can now be worked on interferometrically.

Attachment 1: zetaDrive.pdf
zetaDrive.pdf
Attachment 2: trekTFs.pdf
trekTFs.pdf
  11423   Fri Jul 17 02:46:07 2015 IgnacioUpdateGeneralNew huddle test data for Wilcoxon 731A results

On Thursday, new huddle test data for the Wilcoxon 731A was aquired by Eric. 

The difference between this new data and the previous data, is:

1) We used three accelerometers instead of six this time around.

2) We used a foam box, and clamped cables on the experimental set up as shown in the previous elog, http://nodus.ligo.caltech.edu:8080/40m/11389

I have analyzed the new data. Here I present my results.

The following plot shows the ASD's for the three accelerometers raw outputs as well as their error signals computed using the three cornered hat method,

As before, I computed the mean for the output signals of the accelerometers above as well as their mean self noise to get the following plot

,

Now, below I compare the new results with the results that I got from the old data, 

Did the enclosure and cable clamping do much? Not really, according to the computed three hat results. Also, notice how much better, even if its a small improvement, we get from using six accelerometers and calculating their self noise by the six cornered hat method.

 

Now, I moved on to analyzing the same data with Wiener Filtering.

Here are again, the raw outputs, and the self noises of each individual accelerometer calculated using Wiener filtering,

The accelerometer in the Y direction is show a kind of funky signal at low frequncies. Why? Anyways, I calculated the mean of the above signals as I did for the three cornered hat method above to get the following, I also show the means of the signals computed with the old data using wiener filtering,

Is the enclosure really doing much? The Wiener filter that I applied to the huddle test old data gave me a much better, by an order of magnitude better self noise curve. Keep in mind that this was using SIX accelerometers, not THREE as we did this time. I want to REDO the huddle test for the WIlcoxon accelerometers using SIX accelerometers with the improved experimental setup to see what I get.

Finally, I compare the computed self noises above with what the manufacturer gives,

,

As I expected, the self noise using six accelerometers and Wiener filtering is the best I could work out. The three cornered hat method works out pretty well from 1 to 10 Hz, but the noise is just too much anywhere higher than 10 Hz. The enclosed, clamped, 3 accelerometer wiener filter result is an order of magnitude worse than the six accelerometer wiener filtered result, and two orders of magnitude worse than the three cornered hat method in the 1 to 10 Hz frequency band. 

As I stated, I think we must performed the huddle test with SIX accelerometers and see what kind of results we get.

Attachment 1: selfnoise_allthree_threehat_enclosed.png
selfnoise_allthree_threehat_enclosed.png
Attachment 2: selfnoise_3hat_enclosed_averages.png
selfnoise_3hat_enclosed_averages.png
Attachment 3: selfnoise_3hat_6hat_enc.png
selfnoise_3hat_6hat_enc.png
Attachment 4: miso_wiener_enclosedall.png
miso_wiener_enclosedall.png
Attachment 5: selfnoise_wiener_enclosed.png
selfnoise_wiener_enclosed.png
Attachment 6: compare_encl.png
compare_encl.png
  2886   Thu May 6 16:18:37 2010 AlbertoUpdate40m UpgradingNew improved design for the 11MHz photodiode

After munching analytical models, simulations, measurements of photodiodes I think I got a better grasp of what we want from them, and how to get it. For instance I now know that we need a transimpedance of about 5000 V/A if we want them to be shot noise limited for ~mW of light power.

Adding 2-omega and f1/f2 notch filters complicates the issue, forcing to make trade-offs in the choice of the components (i.e., the Q of the notches)

Here's a better improved design of the 11Mhz PD.

Attachment 1: pox11.pdf
pox11.pdf
ELOG V3.1.3-