 Tue Aug 15 09:56:52 2023, yuta, Update, IOO, PMC aligned, c1sus2 crashed 
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[JC,
Yuta]
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Tue Aug 15 17:11:17 2023, Koji, Update, IOO, FIXED: PMC issue 7x
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Summary
The problem in the PMC Frequency Reference Card (35.5MHz) was fixed.
The last opamp stage of the attenuator control (LT1125) had the negative rail, and the EOM drive level was maximally attenuated. |
 Wed Aug 16 12:49:37 2023, Deven, Update, LSC, PCA of noise spikes in sensor ASDs 6x
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Basic Idea
The idea behind this study was that in several frequency ranges, there are spikes, or just dominant features, in the ASD of each of the sensors.
I’ll model these noise sources as a signal where |
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Wed Aug 16 17:16:13 2023, Koji, Update, General, BHD / Misc Inventory 11x
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== BHD Components ==
BHD BS:
We still have a spare BHD BS @South end optics cabinet. (Attachment 1) |
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Wed Aug 16 18:33:40 2023, yuta, Update, LSC, PRMI 1f/3f switching in both carrier/sideband resonant configurations
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[JC, Yuta]
Transitioning from 1f to 3f in both PRMI carrier and sideband is now smooth
once you have PRMI nicely aligned (key is to tweak TT1 and TT2). |
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Wed Aug 16 20:34:22 2023, Deven, Update, LSC, PRMI OLTFs measured with new input matrix
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After Yuta locked PRMI and measured the sensing matrix, I changed the input matrix to the following and measured the MICH and PRCL OLTFs.
AS55Q |
REFL11_I |
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Fri Aug 18 14:43:24 2023, Murtaza, Update, General, Acoustic Noise Spectrum of various lab spaces. (100Hz-10kHz)
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dB(A) (A-weighted) scale and the Noise Criterion (NC) scale are popularly used in the United States for creating the spectrum.
dB(A) Explanation: https://www.engineeringtoolbox.com/decibel-d_59.html
NC Explanation: https://www.engineeringtoolbox.com/nc-noise-criterion-d_725.html |
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Fri Aug 18 15:40:23 2023, andrei, Update, PEM, Seismometer heater and temp sensors
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Dismantled the seismometer circuit
At Rana's request, Deven and I have pulled all the wires out of the seismometer at the X end that Adviat set up the heater and sensors for.
Right now, the seismometer is uncovered (no can) and the can I had to move next to the server rack that is close to the X end. I am attaching pictures |
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Fri Aug 18 16:07:38 2023, deven, Update, PEM, Seismometer heater and temp sensors
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| I've turned off the power supply. I've attached a picture of the rack with the switch that I flipped circled |
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Mon Aug 21 10:56:16 2023, JC , Update, VAC, Vacuum Loss of N2 Pressure
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There was a loss of N2 pressure over this weekend. When I came in to check the cylinder pressures, I was able to hear a hissing sound come from the copper
fittings. I attached a photo of where the leak was coming from. I proceeded to tighten the fitting and check with soap and water for any leaks. To do this,
I preffered to work with low pressure to make sure nothing would pop off while I was fixing this. Everything is back to normal here, but the vacuum interlocks |
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Tue Aug 22 10:29:14 2023, paco, Update, Optical Levers, Storm and earthquake recovery -- ETMY oplev laser dead, ITMY stuck?
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[JC, paco]
This morning we noted most optics were tripped, probably as a result of a recent M>5 earthquake in the area (on Sun 08/20). Most optics were
restored and damped nicely, except for ITMY. |
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Tue Aug 22 10:52:17 2023, Murtaza, Update, General, Acoustic Noise Spectrum
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This is an update for 17794.
The UMIK 1 + REW combination gave satisfactory results for creating the acoustic noise spectrum for various spaces. This combination was corroborated
using the NIOSH app on iOS (by OSHA) and the real time readings were usually in the +-2dB range of each other. dBA scale (reference |
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Tue Aug 22 11:31:38 2023, paco, Update, Optical Levers, Storm and earthquake recovery -- ITMY restored
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[JC, Koji-remote, paco]
ITMY stuck --> Shaken remotely and restored, ARMS aligned
With Koji's assistance we restored ITMY (it was stuck) and finished aligning both arms. Then JC centered the OpLevs for ETMs, ITMs and BS |
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Tue Aug 22 13:36:05 2023, Ian MacMillan, Update, SEI, Accelerometer calibration
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[Ian, Torrey Cullen, Sander Vermeulen]
We are trying to calibrate one of the Wilcoxon accelerometers from the cryo lab to do a seismic study of campus. To calibrate it, we took data
on Friday afternoon until about 6 pm for the Wilcoxon in the X, Y, and Z orientations and took cross-spectra with the seismometer down the end of |
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Tue Aug 22 15:56:53 2023, Koji, Update, General, BHD / Misc Inventory
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| Photodiode inventory: [OMC ELOG 615] |
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Wed Aug 23 16:11:03 2023, Paco, Update, General, Excess noise on YALS BEAT
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[Paco]
Tuning the YAUX laser lowered the excess BEATY noise.
Since as of this post the only change in the YAUX setup was the death and replacement |
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Wed Aug 23 16:52:52 2023, Paco, Radhika, Murtaza, Update, ASS, Reducing XARM-ASS Errors
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We're trying to reduce the demodulated error signals after running the ASS script for the XARM.
After running the ASS script, we initially tried to play around with the with the EXC Gain and brought all of them down to 300. It didn't
make a huge difference on the error signals or the transmission signal. We then tried tweaking the XARM_OUT_MTRX by flipping the signs/changing the magnitude |
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Wed Aug 23 19:47:53 2023, Koji, Update, CDS, Dolphin Fencing Investigation / Full CDS crash / nodus reboot / recovered all
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Dolphin Investigation
- I made a basic description on a wiki page: https://wiki-40m.ligo.caltech.edu/CDS/DolphinSwitch
- Investigation crashed c1lsc/c1sus/c1iscex/c1sus2. Well, it's time to test the dolphin fencing. It |
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Thu Aug 24 02:54:19 2023, Koji, Update, BHD, OMC Interface Aligner / BHD OFI arrangement
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OMC Interface Aligner - (It's upside down...)
BHD OFI arrangement |
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Thu Aug 24 11:16:44 2023, rana, Update, General, Excess noise on YALS BEAT
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With such a big temperature change, do you still get a reasonable beat note frequency? There's some previous elog of Koji I think that explains how
we need to tune the lasers to get the 3 lasers to give 2 beat notes that are below 150 MHz.
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Thu Aug 24 17:08:38 2023, Koji, Update, General, Excess noise on YALS BEAT
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Paco took the data which means he already had the beat note.
There is some chance that the beat was recovered after some mode "jumps" but usually the temp gap for the same beat frequency is ~2degC.
So my speculation is that there is a big temp gradient in the crystal now and had to compensate it with the struggle of the crystal TEC. |
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Fri Aug 25 20:27:33 2023, Koji, Update, BHD, OMC Interface Aligner
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A bit improved the design of OMC Interface Aligner
The idea is...The OMC I/F aligner covers the OMC for aligning the kinematic mounts (3 pairs of a V-groove and a ball) on the OMC. This makes
the kinematic mount of two OMCs identical. |
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Fri Aug 25 22:52:30 2023, Koji, Update, General, Taking nodus /home/export backup
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Took the backup (snapshot) of nodus' /home/export as of Aug 25, 2023
controls@nodus> cd /cvs/cds/caltech/nodus_backup
controls@nodus> rsync -ah --progress --delete /home/export ./export_230825 >rsync.log& |
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Tue Aug 29 01:39:47 2023, Koji, Update, General, BHD / Misc Inventory
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40m BHD OFI Inventory
OFI HWP 1
Motorized Rotary Stage Thorlabs PDR1V Qty 1
0.5inch HWP: QWPO-1064-05-2 |
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Tue Aug 29 02:02:51 2023, Koji, Update, BHD, BHD Prep Status
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Ready / Soon Ready
- BHD OMC Cables ready
- OMC#1 / OMC#4 ready |
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Tue Aug 29 18:02:35 2023, Radhika, Update, Daily Progress, T&R measurement setup for PR2
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The intented AOI for PR2 is 1.5 degrees. I averaged the peak measurements from the Moku:Go spectrum analyzer and from manual python FFT.
The transmissivities for p- and s-polarizations are:
p-pol
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Wed Aug 30 17:40:31 2023, Murtaza, Update, SUS, ETMX Testing
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Update to 17809. The free swing test for ETMX took quite some time, here's a brief summary
of what was going wrong and a small update on it.
tldr: The scripts haven't been too helpful to obtain the resonant frequencies. Paco (to the rescue) suggested pulling up the raw data from |
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Thu Aug 31 02:05:09 2023, Hiroki, Update, LSC, MICH noise in various conditions
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[Yuta, Hiroki]
*This work was done on Aug. 10th.
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Thu Aug 31 10:15:21 2023, Radhika, Update, , Electronic CARM to ALS CARM handoff
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[Paco, Radhika]
ALS control of CARM
Yesterday evening, Paco and I aimed
to: |
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Fri Sep 1 18:06:35 2023, Paco, Radhika, Murtaza, Update, ASS, Reducing XARM-ASS Errors
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[Radhika, Murtaza]
XARM ASS
We resumed playing around with ASS for XARM. We approached
each error signal one at a time to try to determine the sign of actuation and ensure the error was reduced. |
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Sun Sep 3 08:30:56 2023, Hiroki, Update, LSC, ALS noise on Aug. 10th
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[Yuta, Hiroki]
*This work was done on Aug. 10th.
We measured the ALSX noise and ALSY noise on Aug. 10th as shown in Attachment 1. |
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Sun Sep 3 08:37:18 2023, Hiroki, Update, General, Put away beam chopper
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*This work was done on Aug. 11th.
I put away the beam chopper used in T&R measurement into the shelf in
YARM (Attachment 1). |
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Sun Sep 3 08:47:43 2023, Hiroki, Update, Optical Levers, Found a fiber-coupled visible diode laser (iFLEX-1000)
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[Koji, Hiroki]
*This work was done on Aug. 11th.
We found a fiber-coupled visible diode laser (iFLEX-1000) in a shelf on YARM (Attachment 1 and 2). |
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Tue Sep 5 11:04:33 2023, rana, Update, ASS, Reducing XARM-ASS Errors
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I recommend usinng the DC offset method that Koji and I used for measuring the IMC WFS sensing matrix (not the AC method that Anchal used). With a sensing
matrix, you should be able to do some partial inversion.
Without any sensing matrix inversion, we would have to rely on a gain hierarchy for getting the loops to work. |
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Wed Sep 6 12:53:11 2023, Paco, Radhika, Murtaza, Update, ASS, Reducing XARM-ASS Errors
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[Radhika, Murtaza]
To create the sensing matrix, we tried the DC offset method by giving offsets in the Pitch and Yaw DOFs for ITMX, ETMX and the BS respectively.
The signals we looked at were the demodulated ETMX_L, ETMX_T and ITMX_T. We wrote a quick notebook that does the following things for each DOF: |
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Thu Sep 7 16:25:01 2023, Murtaza, Update, SUS, ETMX Testing
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COIL BALANCING FOR ETMX
Summary : I ran coil balancing on ETMX using the CoilStrengthBalancing.ipynb script to get a feel for it, no
changes were required from the last time it was run by Paco. I realized I was |
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Thu Sep 7 18:42:02 2023, Paco, Radhika, Murtaza, Update, ASS, Reducing XARM-ASS Errors
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[Radhika, Murtaza]
We recalculated the sensing matrix for XARM ASS by collecting each sensor's step response to an offset in each DOF. This produced the following dense
output matrix A (see Attachment 1 for rows/cols): |
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Thu Sep 7 21:09:17 2023, Paco, Update, , eCARM and eDARM to ALS CARM and ALS DARM
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Tonight I managed to lock CARM and DARM under ALS control only
Configuration
Arm cavities well aligned, TRY ~ 1.07, TRX ~ 0.98, GTRY ~ 1.2, GTRX ~ 0.77
HEPA off, WFS 60s offloaded, PD offsets removed, |
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Fri Sep 8 17:11:53 2023, Koji, Update, CDS, FSSSlow restoration
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I came to the lab to see the recovery work from the power glitch this morning 8:15AM. All CDS seems up. The suspensions are somewhat aligned. Some of
them were not damped. The oplevs were off. Radhika is working on the recovery of the FP arms.
I noticed that FSS Slow servo is not working. I always forget what is the right way to turn it on. Here is the summary: |
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Sat Sep 9 16:25:07 2023, Radhika, Update, ASS, Reducing XARM-ASS Errors
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[Radhika, Murtaza]
This post summarizes XARM ASS efforts from Friday 9/8 and Saturday 9/9.
FRIDAY
On Friday, we continued with our previous output |
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Mon Sep 11 19:35:27 2023, Radhika, Update, ASS, Reducing XARM-ASS Errors
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[Radhika, Murtaza, Paco]
Today we decided to take a closer look at the demod phases of the T and L error signals for XARM ASS. By eye we tuned the phases to minimize
the signal in Q. Here are the new demod phases: |
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Tue Sep 12 18:49:51 2023, Koji, Update, General, Transformed 3x 18bit AI chassis into 16bit
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For the preparation of the electronics upgrade, three 18bit DAC AI chassis were transformed to 16bit version.
The power supply connections were touched, so the units were tested with +/-18V, and they work as expected. |
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Fri Sep 15 18:50:34 2023, Koji, Update, CDS, Dolphin Fencing Investigation / Full CDS crash / nodus reboot / recovered all
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Dolphin Fencing technique
I believe that the dolphin emits some glitches to the other hosts during the host machine shutting down and starting up.
However, if the dolphin is disabled, that FE process will not run. |
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Thu Sep 21 12:02:25 2023, Koji, Update, General, Power Outage Sept 21, 2023 ~9AM
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[JC, Paco, Koji]
We had a power outage on Sept 21, 2023 at ~9AM. This is the third power outage this month as far as I remember.
- JC reported the outage was ~2sec. Some UPS supported machines were affected, while some unsupported machines also survived the incident cf |
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Fri Sep 22 19:05:19 2023, Koji, Update, General, Power Outage Sept 21, 2023 ~9AM
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Pumping configuration changed. Now TP2 is backing TP1 and TP3 is pumping annuli.
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Fri Sep 22 19:31:24 2023, Koji, Update, SUS, Fixed IMC/IFO alignment screens
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| Fixed IMC/IFO alignment screens |
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Mon Sep 25 15:32:57 2023, JC, Update, IOO, IMC Alignment After C1Sus2 Crash This Morning
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[Paco, Murtaza, JC]
Fixed C1SUS2 Crash from this morning
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Mon Sep 25 17:01:46 2023, Murtaza, Update, , IFO ALIGNED (WITH SOME ISSUES)
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[JC, Paco, Radhika, Murtaza]
IFO ALIGNED
1. WFS Relief
We tried to change the gain to offload the offsets in the reliefMCWFS script but it The gains might need some tuning |
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Tue Sep 26 14:07:00 2023, Murtaza, Update, , IFO ALIGNED (WITH SOME ISSUES)
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[Paco, Murtaza]
SUCCESSFUL_NOTYET
To fix the WFS loops, went through the following steps W |