 Thu Nov 3 14:42:57 2022, Anchal, Update, SUS, MC2 coil strengths balanced
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Balanced MC2 coil strengths using the same method.
Final coil strengths found:
C1:SUS-MC2_ULCOIL_GAIN: 1.074 |
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Thu Nov 3 16:22:11 2022, Anchal, Update, SUS, MC3 coil strengths balanced
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Balanced MC3 coil strengths using the same method.
Final coil strengths found:
C1:SUS-MC3_ULCOIL_GAIN: 0.942 |
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Thu Nov 3 17:36:00 2022, Anchal, Update, SUS, F2A filters on MC1, MC2, and MC3 set to test at 1 am
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Quote:
I'll setup
some test of switching between different Q filters in future. |
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Thu Nov 3 20:07:01 2022, Anchal, Summary, BHD, AS1 coil balancing required
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[Anchal, Koji]
The LO phase lock that was achieved lasts for a short time because as soon as a considerable POS offset is required on AS1, the POS to PIT coupling
causes the AS-LO overlap to go away. To fix this, we need to balance the coil outputs of AS1 atleast and add the f2a filters too. To follow similar |
Mon Nov 7 11:24:05 2022, Anchal, Update, SUS, F2A filters on MC1, MC2, and MC3 set to test at 1 am 
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This test was not successfull as IMC lost lock during the f2A filter trial. However, we do have 1 hour off data when all f2A filters were turned off
in between following GPS times:
start gpstime: 1351584077 |
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Mon Nov 7 12:02:15 2022, Anchal, Update, SUS, IMC test with PSL shutter closed.
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Following configurations were kept today morning:
Start Time
Stop Time
HEPA
PSL Shutter
MC1 f2a
|
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Mon Nov 7 14:38:59 2022, Anchal, Update, SUS, MC3 coil strengths rebalanced
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I checked again today by sending excitation at POS and reading back from C1:IOO-MC_TRANS_P and C1:IOO-MC_TRANS_Y. I found that there was some POS->PIT
and POS->YAW coupling remaining that I was to remove by same method. New coil gains are:
C1:SUS-MC3_ULCOIL_GAIN: 0.942 |
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Mon Nov 7 16:14:43 2022, Anchal, Update, SUS, F2A filter with Q=1, 0.3 stable with MC3
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I tired running for a few hours F2A filter with Q=1 and for maybe 30 min Q=0.3 on MC3 today and that keeps the suspension stable. So I'm going to
put in Q=0.3 at FM1, Q=0.7 at FM2, and Q=1 filter on FM3. I am setting the test again for tonight with some modifications. Now the separate set of filters
will be tried one by one on the three different optics so that we know the best Q filter for each optic. It is set to trigger at 1 am tonight in tmux sessions |
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Mon Nov 7 17:10:41 2022, Anchal, Summary, BHD, QPD installation seems like lost cause
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The new QPD installation is turning out to be much more hard than it originally seemed. After finsing the cable, QPD and interface board, when I tried
to use the cable, it seems like it is not powered or connected to the interface board at all. I tried both QPD ports on the QPD interface board (D990692)
both none worked. I measured the output pins of IDC style connector on the interface board and they seem to have the correct voltages at the correct pins. |
 Mon Nov 7 19:53:12 2022, Anchal, Update, SUS, MC2 OSEMs calibrated using MC_F
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MC2 OSEM outputs were calibrated today using MC_F to get the output values in microns. This was done using
this diaggui file. We drive a sine wave at 13 Hz and 5000 cts at C1:SUS-MC1_BIASPOS_EXC. This signal is read at C1:IOO-MC_F and the C1:SUS-MC1_ULSEN_OUT
and similar OSEM output channels. MC_F calibration in Hz is assumed to be correct. In diaggui, a calibration conversion of 4.8075e-14 m/Hz is added to |
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Mon Nov 7 20:00:37 2022, Anchal, Update, SUS, MC1 OSEMs output is weird
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Following up, I tried to do this exercise with MC1 and MC3. While MC3 shows expected minute corrections to the previous value, MC1 showed much alrger
corrections which led me to investigate further. Koji suggested to take a transfer function between MC_F and the OSEM outputs for both MC1 and MC3 the
same way to see if something is different. And Koji was absolutely right. MC1 MC_F to OSEM outptu transfer function has a frequency dependent |
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Tue Nov 8 10:23:42 2022, Anchal, Update, SUS, MC3 damping loop step responses
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I tuned MC3 local damping gains by looking at step responses in the DOF bassis. The same procedure was followed as described in 40m/17133. The gains
were changed as following:
Old |
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Tue Nov 8 10:35:26 2022, Anchal, Update, SUS, IMC F2A test
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This time the test was succesful but I have reverted MC3 f2a filters back to with Q=3, 7, and 10. The inital part of the test is still useful though.
I'm attaching amplitude spectral density curves for WFS control points and C1:IOO-MC_F_DQ in the different configurations. The shaded region is the
15.865 percentile to 84.135 percentile bounds of the PSD data. This corresponds to +/- 1 sigma percentiles for a gaussian variable. |
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Tue Nov 8 18:12:01 2022, Anchal, Update, SUS, MC2 OSEMs calibrated using MC_F
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I reran this measurement at low frequency 0.1016 Hz. Following were the cts2um gain changes:
UL 0.28510 -> 0.30408(0.00038)
UR 0.26662 -> 0.28178(0.00027)
LL 0.34861 -> 0.38489(0.00049)
LR
0.71575 -> 0.80396(0.00681)
Edited AG: Wed Nov 9 12:17:12 2022 : Uncertainties added by taking coherence of each channel and MC_F |
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Tue Nov 8 19:39:34 2022, Anchal, Update, SUS, MC3 OSEMs calibrated using MC_F
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I did the same measurement for MC3 with one difference that OSEMs report more motion than IMC cavity length change due to it being at 45 degrees. Following are the new cts2um gain values
UL 0.36 -> 0.39827(0.00045)
UR 0.36 -> 0.33716(0.00038)
LL 0.36 -> 0.34469(0.00039)
LR |
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Wed Nov 9 11:07:16 2022, Anchal, Update, SUS, IMC test
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Following configurations were kept today morning:
Start Time
Stop Time
HEPA
PSL
Shutter
WFS Loops
1352046006 |
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Wed Nov 9 20:01:38 2022, Anchal, Update, SUS, MC1 OSEMs output is weird
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I took a coil to OSEM transfer function for MC1 osems (LL, UR) today and again the slope of the transfer function was -1.4 instead of -2 as expected.
I compared this with MC3 coil to osem transfer function (LL) which correctly had the slope of -2. See attachments 1 and 2 for the results. This measurement
was taken with PSL shutter closed and local damping loops turned off. |
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Wed Nov 9 20:29:20 2022, Anchal, Update, SUS, MC2 and MC3 set to undergo free swing test tonight
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I have set a free swing test for MC2 and MC3 to trigger at 1 am tonight. The test should last for about 4.5 hrs upto 5:30 am. It will close the PSL shutter,
perform the test, and open the shutter afterwards. To cancel or interrupt the test, go to rossa and do:
tmux a -t FST |
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Fri Nov 11 11:29:11 2022, Anchal, Update, SUS, MC1 OSEMs output is weird
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Late elog; original time Thursday, Nov 10 16:00 2022
MC1 is using a new satellite amplifier which was a whitening circuit on it with 3 Hz zero and
30 Hz pole. But to read out this signal, we use the old whitening board as it serves as the interface board with the ADC too. This is D000210 |
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Sat Nov 12 21:59:24 2022, Anchal, Frogs, Computer Scripts / Programs, FSS SLOW servo not running
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I stopped the Docker PID script and started the old python script on megatron. Instructions on how to do this are here.
On optimus I ran:
sudo docker stop scripts_PID_FSS_Slow_1
On megatron I ran: |
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Thu Nov 17 16:48:07 2022, Anchal, Frogs, Computer Scripts / Programs, FSS SLOW servo running Now
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I've moved the FSS Slow PID script running to megatron through systemd daemons. The script is working as expected right now. I've updated megatron
motd and the always running scripts page here. |
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Fri Nov 18 17:00:15 2022, Anchal, Update, SUS, MC1 and MC3 OSEMs calibrated using MC_F
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After the MC1 osem dewhitening was fixed, I did the calibration of MC1 OSEM signals using MC_F using this notebook.
A 0.1 Hz oscillation with amplitude of 1000 cts was sent to MC1 lockin2 and was kept on between 1352851381 and 1352851881. Then I read back the data from
DQ channels and performed a welch with standard deviation calculation from the different segments used. From this measurement, I arrive to the following |
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Sun Nov 20 13:42:21 2022, Anchal, Update, SUS, IMC test
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I repeated this test for the following configuration:
PSL shutter closed at good IMC transmission
Offset value of 14000 written to C1:IOO-MC_TRANS_SUM_FILT_OFFSET
WFS
loops ON but ASCPIT outputs of the optics were turned off.
The test ran for 4000 seconds between following timestamps: |
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Mon Nov 21 18:33:05 2022, Anchal, Update, SUS, MC2 OSEMs calibrated using MC_F
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Repeated this for MC2 using the error measurement technique mentioned in 40m/17286 using this
notebook.
Following are the cts2um gain changes: |
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Tue Nov 22 10:29:31 2022, Anchal, Summary, SUS, ITMY Coil Strengths Balanced
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I followed this procedure to balance the coil strengths on ITMY. The position sensor was created
by closing PSL shutter so that IR laser is free running, and locking the green laser to YARM, this makes C1:ALS-BEATY_FINE_PHASE_OUT a position sensor
for ITMY. The oplev channels C1:SUS-ITMY_OL_PIT_IN1 and C1:SUS-ITMY_OL_YAW_IN1 were used for PIT and YAW sensors. Everything else followed the procedure. |
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Wed Nov 23 11:06:08 2022, Anchal, Update, BHD, c1hpc and c1sus modified to add BS dither and demodulation option
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c1hpc has option of dithering BS now (sending excitation to BS LSC port to c1sus over IPC). This is available for demodulating BHDC and BH55 signals.
Also BS is a possible feedback point, however, we would stick to using LSC screen for any MICH locking.
c1sus underwent 2 changes. All suspension models were upgraded to the new suspension model (see 40m/16938 |
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Thu Nov 24 11:23:35 2022, Anchal, Update, SUS, Low noise state
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I've turned off HEPA fan and all lights at
PST: 2022-11-24 11:23:59.509949 PST
UTC: 2022-11-24 19:23:59.509949 UTC |
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Thu Nov 24 15:37:45 2022, Anchal, Update, ASC, IMC WFS output matrix diagonalization effort
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I tried following the steps and the method I was using converged to same output matrix upto 2 decimal points but there is still left over cross coupling
as you can see in Attachment 1. With the new output matrix, WFS loop can be turned on with full overall gain of 1.
Changes:
I switched off +20dB FM2 on C1IOO-WFS1_PIT and increased gain C1:IOO-WFS1_PIT_GAIN from |
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Fri Nov 25 12:15:46 2022, Anchal, Update, VAC, Vacuum Gate valves restored
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I came today to find that PSL shutter was closed. I orginially thought some shimmer obersvations are underway in the quiet state. But that was not the
case. When I tried to open the shutter, it closed back again indicating a hard compliance condition making it close. This normally happens when vacuum
level is not sufficient, so I opened the vacuum screena dn indeed all gate valves were closed. This most probably happend during this interlock |
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Fri Nov 25 15:35:23 2022, Anchal, Update, SUS, Low noise state
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Turned off HEPA at:
PST: 2022-11-25 15:34:55.683645 PST
UTC: 2022-11-25 23:34:55.683645 UTC |
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Mon Nov 28 11:15:23 2022, Anchal, Update, CDS, Front ends DAC Kill (DK) got activated; restored FEs
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[Anchal, Paco, Yehonathan, JC]
Last night at 9:15 pm PST (Nov 27th, 2022) some kind of disruption happened to FEs. See attachment 1 to see the changes in FE state words of
the IOP models. on c1lsc, c1sus and c1scex, change of 140 happend, that's 2nd, 3rd and 7th bit of the FE word was flipped, which I think is the TIM, |
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Mon Nov 28 16:53:22 2022, Anchal, Summary, BHD, F2A filters on LO1 LO2 AS1 and AS4
|
[Paco, Anchal]
I changed the script in /opt/rtcds/caltech/c1/Git/40m/scripts/SUS/outMatFilters/createF2Afilters.py
to read the measured POS resonant frequencies stored in /opt/rtcds/caltech/c1/Git/40m/scripts/SUS/InMatCalc/resFreqs.yml |
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Mon Nov 28 20:14:27 2022, Anchal, Update, ASC, AS WFS proposed path to IMC WFS heads
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In Attachment 1, I give a plan for the proposed path of AS beam into the IMC WFS heads to use them temporarily as AS WFS. Paths shown in orange are the
existing MC REFL path, red for the existing AS path, cyan for the proposed AS path, and yellow for the existing IFO refl path. We plan to overlap
AS beam to the same path by installing the following new optics on the table: |
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Tue Nov 29 15:32:32 2022, Anchal, Update, BHD, c1hpc model updates to support double audio dither
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Many changes have been done to c1hpc to support dual demodulation at audio frequencies. We moved away with ASS style of lockin setup as the number of
connections and screens required would become very large. Instead now, the demodulation is done for a selected oscillator, on a selected signal. Similarly,
the demodulated signal can be further demodulated for another selected oscillator. Please familarize yourself with new screen and test the new model. The |
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Thu Dec 1 20:43:25 2022, Anchal, Summary, Calibration, Single arm cal with 5 lines
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[Anchal, Paco]
We are doing this attempt again in following configuration:
PSL shutter is closed. (So IR laser is free running)
Beanote frequency between Y arm and Main laser is about 45 MHz.
Green |
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Sat Dec 3 10:13:56 2022, Anchal, Update, SUS, Low noise state
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I've turned off HEPA fan and all lights at:
PST: 2022-12-03 10:13:03.184705 PST
UTC: 2022-12-03 18:13:03.184705 UTC |
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Sat Dec 3 17:42:25 2022, Anchal, Update, ASC, IMC WFS Fixed for now
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Today I did a lot of steps to eventually reach to WFS locking stably for long times and improving and keeping the IMC transmission counts to 14400. I
think the main culprit in thw WFS loop going unstable was the offset value set on MC_TRANS_PIT filter module (C1:IOO-MC_TRANS_PIT_OFFSET). This value
was roughly correct in magnitude but opposite in sign, which created a big offset in MC_TRANS PIT error signal which would integrate by the loops and misalign |
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Sun Dec 4 16:44:04 2022, Anchal, Update, ASC, IMC WFS Fixed for now
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Today, I worked on WFS loop output matrix for PIT DOFs.
I began with the matrix that was in place before Nov 15.
I followed the same method as last time to fist get all UGFs around
0.06 Hz with overall gain of 0.6 on the WFS loops.
This showed me that MC2_TRANS_PIT loop shape matches well with the nice working YAW loops, |
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Mon Dec 5 12:05:29 2022, Anchal, Update, CDS, c1sus2 all FE models crashed spontaneously
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Just a few minutes ago, all models on FE c1sus2 crashed. I'm attaching some important files that can be helpful in investigating this. CDS upgrade
team, please take a look.
I fixed this by running following on c1sus2: |
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Mon Dec 5 16:24:45 2022, Anchal, Update, ASC, IMC WFS servo diagnosis
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Also reply to: 40m/17255
I ran the toggleWFSoffsets.py
script to generate a step response of the WFS loops in operation. Attachment 1 shows the diaggui |
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Mon Dec 5 20:02:06 2022, Anchal, Update, ASC, IMC WFS heads electronic feasibility test for using for Arm ASC
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I took transfer function measurement of WFS2 SEG4 photodiode between 1 MHz to 100 MHz in a linear sweep.
Measurement details:
The reincarnated Jenne laser head was used for this test. The laser diode is
950 nm though, which should just mean a different responsivity of the photodiode while we are mainly interested in relative response of the WFS heads at |
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Tue Dec 6 16:52:26 2022, Anchal, Update, ASC, IMC WFS heads electronic feasibility test for using for Arm ASC
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I tested teh WFS demod board for possibility of demodulating 11 MHz or 55 MHz signal with it. It definitely has some bandpass filter inside as the response
is very bad for 11 MHz and 55 MHz. See attached the ASD curves for the excitations seens on I and Q inputs of WFS1 Segment 2 when it was demodulated with
a clock of different frequencies but same amplitude of 783.5 mVpp (this was measured output of 29.5 MHz signal from RF distribution board). See attachments |
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Thu Dec 8 20:40:14 2022, Anchal, Update, ASC, WFS demodulation board modification attempt
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Based on the previous two elog posts, Koji and I decided that we should use 11 MHz signal for arm cavity ASC and modify a spare WFS demod board to work
at 11 MHz. This board LIGO-D980233, uses a PLL to lock the to LO input and generate I and Q ECL
clock signals from it. For this purpose, it uses POS-XX minicircuits VCO. For IMC WFS boards the model number is POS-75 and with the board design, it can |
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Fri Dec 9 14:18:43 2022, Anchal, Summary, SUS, IMC optics angular actuation calibration at DC
|
Also reply to: 40m/16125
I migrated the code used in 40m/16125 to our scripts
git repo and used it to apply offsets to IMC optics and noticing the parabolic change in the transmission values. Fitting the data with parabola and |
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Tue Dec 13 23:49:17 2022, Anchal, Update, SUS, Low noise state
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I've turned off HEPA fan and all lights at:
PST: 2022-12-13 23:49:12.955214 PST
UTC: 2022-12-14 07:49:12.955214 UTC |
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Fri Dec 16 21:55:54 2022, Anchal, Update, ASC, WFS demodulation board modification attempt 2 - sort of working
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[Koji, Anchal]
short version: We checked signals at different points in the circuit to make sense of why it was not working. We found out that teh comparator
chip AD96687BR was not working as expected and was not converting the analog signal from our VCO or LO inputs to ECL. We tested 2 other spare board with |
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Fri Dec 16 22:06:55 2022, Anchal, Update, SUS, Low noise state
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I've turned off HEPA fan and all lights at:
PST: 2022-12-16 22:06:53.830911 PST
UTC: 2022-12-17 06:06:53.830911 UTC |
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Sat Dec 17 16:56:19 2022, Anchal, Update, ASC, WFS demodulation board modification - further study
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I played with the PLL bit more today to understand the issue. From what I understand, the following is the summary:
Moku as VCO in WFS demod board PLL:
Moku input in VCO mode is actually limited to ~ +/-21 V contrary to
what it says on the app (10 Vpp)
Whenever the VCO tuning signal goes beyond this range, Moku just ignores the input and sends a pure sine wave |
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Tue Dec 20 18:27:14 2022, Anchal, Summary, LSC, FPMI locked, DARM calibration data taken, FPMI BHD locked!
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[Anchal, Paco, Yuta]
FPMI locked with BHD
readout!!! |
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Tue Jan 3 11:32:32 2023, Anchal, Update, CDS, Yearly DAQD fix 2023, did not work :(
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Every year some changes need to be done manually in a driver c code file for daqd to work. The gpstime offset needs to be changed on fb for some package.
We followed the procedure on this thread, but this year it did not work. Here is a summary of our findings:
We first confirmed this is indeed the issue by doing: |