 Tue Aug 30 15:44:28 2016, Steve, Update, SUS, wire standoffs update
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100 Sapphire prisms ordered. Delivery date 9-30-2016
~60 deg. prisms,
Size A=B=C=2 mm, length 5 mm |
Tue Oct 11 10:38:51 2016, Steve, Update, SUS, wire standoffs update 
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100 Sapphire prizms arrived.
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Fri Jan 27 14:50:04 2017, Steve, Update, SUS, wire standoffs update
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The 3 pieces of Sapphire v-groove test cuts are back. They look good. The suspension wire 0.0017"
( 43 micron ) is show on some of the pictures. |
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Fri Jan 27 15:36:17 2017, Koji, Update, SUS, wire standoffs update
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Very nice! I got excited.
Don't you ask Calum and co to check the groove size with their microscopes? Just give the samples and the wire.
Do we
want to make a simple "guitar" setup to measure the vibration Qs with Al piece, glass prism, ungrooved Sapphire, this grooved sapphire, grooved |
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Thu Feb 23 09:32:20 2017, Koji, Update, SUS, wire standoffs update
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Kyle took high quality images of the three sapphire prisms using the microscope @Downs. He analyzed the images to see the radius of the groove.
They all look sufficiently sharp for a 46um steel wire. Thumbs up.
I am curious to see how the wire Q is with grooved sapphires, ungrooved sapphires, grooved ruby, grooved aluminum stand off, and so on. |
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Thu Jun 1 16:21:55 2017, Steve, Update, SUS, wire standoffs update
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Ruby wire standoff received from China. I looked one of them with our small
USB camera. They did a good job. The long edges of the prism are chipped.
The v-groove cutter must avoid them. Pictures will follow. |
 Fri Mar 6 01:04:49 2009, Kiwamu IZUMI, Configuration, IOO, !! lock-in amp disconnected !!
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The power supply of a lock-in amp, which is on the Y-arm side of PSL clean room, was pulled out by my mistake.
Then I reconnected it, but I don't know whether it is re-adjusted properly.
I'm sorry about this. If you are using that amp, it should be checked. |
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Mon May 9 16:58:23 2011, Jamie, Bureaucracy, CDS, !!!!REMEMBER TO COMMIT YOUR MODIFICATIONS!!!!
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Whenever you modify any of the front-end code in /opt/rtds/caltech/c1/userapps, such as models, scripts or medm screens, REMEMBER TO COMMIT YOUR
CHANGES, WITH A LOG MESSAGE!!!
cd /opt/rtcds/caltech/c1/userapps/trunk
svn commit path/to/modified/file
If you forget to commit things, |
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Mon May 9 17:21:13 2011, Jamie, Bureaucracy, CDS, !!!!REMEMBER TO COMMIT YOUR MODIFICATIONS!!!!
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Also, remember to update the svn working copy before you begin doing any work, to make sure you're working on the most recent version:
cd /opt/rtcds/caltech/c1/userapps/trunk
svn update
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Wed May 25 19:19:11 2011, Jamie, Configuration, CDS, !!!CHECK IN YOUR MODELS!!!
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!!!CHECK IN MODEL CHANGES!!!
Today I found three models that were modified, but not checked in
to the SVN repository:
M sus/c1/models/lib/sus_single.mdl
M isc/c1/models/c1lsc.mdl
M isc/c1/models/c1mcp.mdl
I checked in the c1lsc |
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Thu Mar 28 23:06:48 2013, Annalisa, Update, Auxiliary locking, "Alberto" NPRO laser again on PSL table
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"Alberto"NPRO laser has been moved again on PSL table in order to make a measurement of the beat note varying also the PSL temperature.
It is useful because if the PSL temperature would drift we have to know which is |
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Tue Nov 1 19:26:38 2011, Zach, Update, SUS, "Dr. SUS" progress
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EDIT: Ran Jamie's NDS2 reset method and it's still not serving up MC data.
I am debugging the SUS input matrix diagonalization code (which I have affectionately termed "Dr. SUS") offline by running everything
except the actual writing of the matrices (%writeSUSinmat()) in a sandbox directory. Some notes: |
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Wed Nov 2 01:53:08 2011, Zach, Update, SUS, "Dr. SUS" progress
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| Now that NDS2 is working, I was able to run all parts of diagAllSUS (except for the matrix writing) without errors. Barring issues with standard commands (freeswing, turnOnWatchDogs.csh, caput, etc.), Dr. SUS |
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Wed Nov 2 11:29:04 2011, not Zach, Update, SUS, "Dr. SUS" progress
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Quote:
Now that NDS2 is working, I was able to run all parts of |
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Thu Apr 3 18:46:04 2008, Andrey, Configuration, Computers, "Network switch board" and "c1pem1 crate" were touched
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While working with the weather station, I did two things that potentially (with a very small probability) might influence the smooth work of other processors/computers.
I did the following on Wednesday, April 2nd, in times between 1PM and 3PM.
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Wed Mar 22 18:38:54 2023, Paco, Summary, BHD, "On why BH55 senses the LO phase, a finesse adventure of loss and residual DARM offsets"
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[Paco, Yehonathan]
I took over the finesse calculations Yehonathan had set up for BHD. The notebook is here
and for this post I focused on simulating what we might expect from our single RF vs dual RF sensors (55 MHz and 44 MHz respectively) in terms of LO phase |
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Thu Mar 23 14:20:29 2023, Koji, Summary, BHD, "On why BH55 senses the LO phase, a finesse adventure of loss and residual DARM offsets"
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This is interesting. With the FPMI, the DARM phase shift is enhanced by the cavity. Therefore, I suppose the effect on the BH55 is also going to be enhanced
(i.e. a much smaller displacement offset causes a similar LO phase rotation).
|
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Mon Mar 27 20:28:57 2023, Paco, Summary, BHD, "On why BH55 senses the LO phase, a finesse adventure of loss and residual DARM offsets"
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Yuta pointed out that the BH55 signal was weirdly never going to zero, so I actually tuned the demod angle and made sure I was reading the right (Q)
quadrature. This doesn't affect our previous qualitative conclusion about DARM offsets, but here's an updated gif which also makes visualization
easier (?). |
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Tue Mar 28 10:58:03 2023, rana, Summary, BHD, "On why BH55 senses the LO phase, a finesse adventure of loss and residual DARM offsets"
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but what about including the DC reflectivity imbalance of the arms? there would be another BH55 term from that field maybe.
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Wed Mar 29 16:36:04 2023, Paco, Summary, BHD, "On why BH55 senses the LO phase, a finesse adventure of loss and residual DARM offsets"
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I repeated the calculations but with FPMI (last case was all MICH). The qualitative behavior
is the same, the BH55 sensing is mostly affected by residual darm offset. If the darm offset is of a couple of nm, the single RF sideband may sense
the LO phase at as much as > 20 deg away from the nominal phase angle. This is not too different from the MICH case; so |
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Thu Feb 28 14:51:43 2013, Jenne, Update, PEM, "Rock Monster" causing low frequency noise
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Manasa and I have been wondering why the low frequency seismic noise has been different in the last few days/weeks. I went over to visit the Rock
Monster, a.k.a. the Earth Surface Dynamics Laboratory next door, and the grad student turned it up for me (increased water flow significantly) for a few
minutes. Then I came back to look at the BLRMS, and you can see the low frequency increase a few minutes ago, when he turned it up on high. |
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Wed Oct 1 12:05:58 2008, Alberto, Configuration, Computers, "StochMon" added to the Alarm Handler
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John, Alberto,
we added the four channels of the RF Amplitude Monitor (aka StochMon) to the Alarm HAndler. First we modified the 40m.alh file just copying some lines |
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Wed Oct 1 12:09:25 2008, Alberto, Configuration, Computers, "StochMon" added to the Alarm Handler
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[quote]John, Alberto,
we added the four channels of the RF Amplitude Monitor (aka StochMon) to the Alarm HAndler. So far I used just test values for the thresholds of green, |
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Wed Feb 6 15:11:21 2013, Jenne, Update, Electronics, "Temporary" power supply situation
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[Jenne, Yuta, Rana, Steve, Manasa]
We have taken stock of the lab "temporary" power supply situation, and things look much better.
This morning, I removed 2 unused power supplies and a function generator from the PSL table - these had been used for MC ringdown things. |
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Thu May 5 15:26:52 2011, Leo Singer, Configuration, Computers, 'glue' installed on some control room computers
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I installed 'glue' on Rossa, Allegra, and Rosalba. This is a Python module that includes a facility for LIGO_LW XML files. Oddly, I couldn't
find the glue package on Pianosa. |
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Fri Oct 25 04:03:40 2013, Masayuki, Update, LSC, 'scope and spectrum analyser for REFL165
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As Jenne's Elog we want to see Spectrum and time series of REFL 165 (our PRMI LSC locking PD) to see if the signal is saturated while bring the arms
into resonance.
I started to connect the spectrum analyser and the 'scope to REFL165 output. |
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Fri Oct 25 21:36:51 2013, Masayuki, Update, LSC, 'scope and spectrum analyser for REFL165
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Quote:
As Jenne's Elog we want to see Spectrum and time series of REFL 165 (our PRMI LSC locking PD) to see if the signal is saturated while bring |
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Mon Oct 28 14:24:01 2013, Masayuki, Update, LSC, 'scope and spectrum analyser for REFL165
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I connected the 'scope between REFL165 output and demod board input. I split the signal from coupler using the splitter (Mini-Circuits
ZFSC-2-5). One signal is going to 'scope CH1 and the other is going to spectrum analyzer. I connected the 'scope to 40MARS. The IP adress is 192.168.113.25. |
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Wed Mar 31 19:29:58 2010, Hartmut, Update, Electronics, (1cm-) Si PD transfer functions update
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Recorded transfer functions for the 1cm Si-PD as described on p. 2708
for different biases. I put the plots in there, to keep the info in one place,
where the label on the PD case (which Steve made without asking him) points |
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Thu May 5 00:08:59 2011, Jenne, Update, LSC, (Almost) New Screens for RFPDs
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I modified C1LSC.mdl to use the CDSphase blocks, which automatically calculate the R and D phase rotation for us. Now each of the RFPDs has 2 channels
in place of the old IQ_MTRX channels: C1:LSC-RFPD_PHASE_R and C1:LSC-RFPD_PHASE_D.
I have not yet compiled / rebooted / done CDS magic to actually make these |
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Wed Oct 7 19:23:49 2009, Jenne, Update, Adaptive Filtering, (Final?) PEM cabling changes
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Quote:
Here's a plot of the spectra of the seismometers and MCL. The coherence shows which axes are aligned right now: |
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Fri Apr 25 10:43:57 2014, Koji, Update, LSC, (Fixed) Y end whitening board
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I went to WB and found the last spare module of D990399 revB. We need to thank Frank for his foresight.
The original (=broken) board had various modifications from this revB.
I had to check the schemaric diagram and the difference between the boards and migrate some of the SMD components from left to right. |
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Thu Dec 11 18:12:46 2014, ericq, Update, LSC, (Fixed) Y end whitening board
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Quote:
Gain mystery |
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Wed Apr 6 19:36:32 2011, Aidan, Summary, Green Locking, (In)sanity check of Green PD - some inconsistencies
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I moved the Hartmut Green PD to the Jenne laser bench to try to determine if the response at RF was reasonable or somehow very much smaller than it should
be. It was set up as shown in the attached diagram. The first pass at this was by comparing the ratio of the RF photocurrent of the green PD to the RF
photocurrent of the New Focus 1611 InGaAs PD. That ratio (at a sufficiently low frequency) should be the same as the ratio the DC photocurrents of the |
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Thu Apr 7 16:09:17 2011, Aidan, Summary, Green Locking, (In)sanity check of Green PD - some inconsistencies
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I think I had underestimated the responsivity of the Silicon PD at 1064nm. The previous value was based on a rough search online for the responsivity
of Silicon (I couldn't find the product number of the actual PD we are using). For instance, the PDA100A Si detector from Thorlabs has a
responsivity of 0.35-0.4A/W at 1064nm. |
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Thu Apr 7 19:28:02 2011, Koji, Summary, Green Locking, (In)sanity check of Green PD - some inconsistencies
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Responsivity of SGD-444A
Quote:
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Fri Aug 6 15:50:29 2010, Gopal, Update, Optic Stacks, (Much Better Looking) Displacement-Displacment Transfer Functions
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I reran the FDA in COMSOL on the MC1/MC3 Stack and produced the following Displacement-Displacement Transfer Functions:
X-Translational
Drive has a blue background |
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Fri Aug 6 19:46:59 2010, Gopal, Update, Optic Stacks, (Much Better Looking) Displacement-Displacment Transfer Functions
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Quote:
I reran the FDA in COMSOL on the MC1/MC3 Stack and produced the following Displacement-Displacement |
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Thu Oct 3 11:01:18 2019, rana, Update, LSC, (PR)FPMI locking
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wonder if its possible to do variable finesse locking
Gabriele mentioned that Virgo used arm trans PDH for this, but I guess we could possibly use POX/POY to start and bring in the PRM with 50% MICH
trans |
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Mon Sep 8 15:50:47 2014, ericq, Update, Computer Scripts / Programs, +15V PSL Sorensen replaced
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We replaced the +15V sorensen at 1X1, and brought the power supplies back up symmetrically, and everything seems fine. I noted that a quarter turn counter-clockwise
took the current limit down by one amp, so I set the knob to just letting 2.8A (the nominal current), and then added one half turn, shooting for ~4A current
limit. |
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Thu Jul 24 03:08:20 2008, rob, Update, Locking, +f2 DRMI+2ARMS
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rob, john, yoichi
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Fri May 25 16:58:54 2012, Jamie, Configuration, Computers, .bashrc for workstations
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I have setup a shared .bashrc for all the workstations that is symlinked to the normal location on all machines:
controls@rossa:~ 0$ ls -al /home/controls/.bashrc
lrwxrwxrwx 1 controls controls 23 2012-05-25 15:37 /home/controls/.bashrc -> /users/controls/.bashrc
controls@rossa:~
0$
This should help simplify maintenance considerably. Editing that file on one machine will edit it for all. |
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Fri Jun 27 15:20:52 2008, rob, DAQ, LSC, .ini file change
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I removed C1:LSC-XARM_CTRL from the frames and added C1:LSC-CARM_ERR |
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Wed Jun 17 01:09:47 2009, rob, Update, Computers, /cvs/cds 91% full
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In /cvs/cds/caltech
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Thu Jun 7 20:21:15 2018, Koji, Update, Computer Scripts / Programs, /cvs/cds Backup in danger
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Local backup on chiara
seems not working since Nov 19, 2017.
/opt/rtcds/caltech/c1/scripts/backup/localbackup.log |
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Thu Jun 14 15:21:58 2018, gautam, Update, Computer Scripts / Programs, /cvs/cds Backup in danger
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I think this is because /cvs/cds is getting too big. lsblk reveals:
controls@chiara|~>
lsblk |
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Mon Oct 20 15:02:00 2008, Yoichi, Configuration, Computers, /cvs/cds restored
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I moved missing files in /cvs/cds restored by Alan and Stuart to the original locations.
I confirmed autoburt runs, and dtt, which had also been having trouble running, runs ok now.
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Mon Oct 20 16:18:00 2008, Alan, Configuration, Computers, /cvs/cds restored
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[quote]I moved missing files in /cvs/cds restored by Alan and Stuart to the original locations.
I confirmed autoburt runs, and dtt, which had also been having trouble running, runs ok now.
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Fri Feb 3 11:40:34 2017, ericq, Summary, CDS, /cvs/cds/caltech/chans back on svn1.6
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I was able to bring back svn 1.6 formatting to /cvs/cds/caltech/chans by doing the following on nodus:
cd /cvs/cds/caltech
mkdir
newchans
cd newchans
svn |
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Sat Feb 4 12:00:59 2017, rana, Summary, CDS, /cvs/cds/caltech/chans back on svn1.6
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True - its an issue. Koji and I are updating zita into Ubuntu16 LTS. If it looks like its OK with various tools we'll swap over the others into it.
Until then I figure we're best off turning allegra back into Ubuntu12 to avoid a repeat of this kind of conflict. Once the workstations in the LLO
control room are running smoothly on a new OS for a year, we can transfer into that. I don't think any of us wants to be the CDS beta tester for DV |