 Mon Jan 10 18:36:41 2022, Anchal, Summary, BHD, LO1 free swinging test set to trigger
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LO1 is set to go through a free swinging test at 1 am tonight. We have used this script (scripts/SUS/InMatCalc/freeSwing.py) reliably in the past so
we expect no issues, it has a error catching block to restore all changes at the end of the test or if something goes wrong.
To access the test, on rossa, type: |
Tue Jan 11 12:19:12 2022, Anchal, Summary, BHD, LO1 Input Matrix Diagonalization performed. 
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The frree swinging test was successful. I ran the input matrix diagonalization code (scripts/SUS/InMAtCalc/sus_diagonalization.py) on the LO1 free swinging
data collected last night. The logfile and results are stroed in scripts/SUS/InMatCalc/LO1 directory. Attachment 1 shows the power spectral density of
the DOF bassis data (POS, PIT, YAW, SIDE) before and after the diagonalization. Attachment 2 shows the fitted peaks. |
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Tue Jan 11 15:21:16 2022, Anchal, Update, BHD, PR2 transmission calculation
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I did this simple calculation where I assumed 1W power from laser and 10% transmission past IMC. We would go ahead with V6-704/V6-705 ATFilms 3/8"
optic. It would bring down the PRC gain to ~30 but will provide plenty of light for LO beam and alignment. |
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Tue Jan 11 18:18:29 2022, Anchal, Summary, BHD, Attempted OSEM installation on AS1
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[Anchal, Paco, Yehonathan]
Connected in-cir cable to new flange on ITMY Chamber
Connected OSEM one-by-one. Starting from top right to left (PIn1) |
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Tue Jan 11 18:40:25 2022, Anchal, Summary, BHD, AS1 Sat Amp has a PCB issue
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AS1 Sat Amp (S2100741) has a critical PCB issue on it's Ch5-8 board S2100548. This board is supposed
to just feed through the coil driver signal from the front DB9 connector to the back DB25 connector but it has a short between pins 2 and 7 at the "Coil
Input" end (connector J1). The short persists even after I disconnect the sat amp to the flange connector on the back of this board, which definitely |
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Thu Jan 13 09:48:41 2022, Anchal, Summary, BHD, AS1 Sat Amp fixed
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I fixed the issue in AS1 Sat Amp (S2100741) by using a razor blade. I cut the short between the
two places, cleaned up the area and covered it with electrical tape. However, later feedback from Rana was to not use electrical tape as it dries up and
becomes brittle and lfaky in long run. So after the AS1 OSEM tuning is over, I'll open this box again and use something else to insulate the exposed |
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Thu Jan 13 12:24:08 2022, Anchal, Summary, BHD, AS1 SD and LR magnets broke
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[Anchal (vacuum work), Paco (outside)]
After the AS1 Sat Amp fix (40m/16579), we today were able to tune all OSEMs to the
mid-bright level. But when we were about to call it, we were told that the new PEEK earthquake stop screw and bolts need to go on the thin suspended optics. |
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Thu Jan 13 12:29:27 2022, Anchal, Summary, BHD, AS4 LR magnet broke
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After the debacle with AS1 (40m/16580), we decided the put the PEEK earthquake stop by first
removing the lower OSEM plate and then doing it. So I unfastened AS4 from its position with the earthquake stops in place and moved the suspension to the
center of the table. Then I carefully removed the bottom OSEM plate. But I found out that the LR magnet is broken and lying on the floor of the suspension |
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Thu Jan 13 17:10:55 2022, Anchal, Update, BHD, PR2 transmission calculation
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I corrected the calculation by adding losses by the arm cavity ends times the arm cavity finesse and also taking into account the folding of the cavity
mirror. I used exact formula for finesse calculation and divided it by pi to get the PRC gain from there. Attachment 3 is the notebook for referring to
the calculations I made. |
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Fri Jan 14 11:00:29 2022, Anchal, Update, BHD, PR2 transmission calculation
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Yeah, I counted the loss from arm cavities as the transmission from ETMs on each bounce. I assumed Michelson to be perfectly aligned to get no light
at the dark port. Should I use some other number for the round-trip loss in the arm cavity? |
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Fri Jan 14 12:01:21 2022, Anchal, Update, Electronics, BS & ITMY feedthroughs labeled and connected to Sat Amps
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I labeled all the newly installed flanges and connected the in-air cables (40m/16530) to
appropriate ports. These cables are connected to the CDS system on 1Y1/1Y0 racks through the satellite amplifiers. So all new optics now can be damped
as soon as they are placed. We need to make more DB9 plugs for setting "Acquire" mode on the HAM-A coil drivers since our Binary input system |
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Fri Jan 14 13:46:25 2022, Anchal, Update, BHD, PR2 transmission calculation updated
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I updated the arm cavity roundtrip losses due to scattering. Yehonathan told me that arm cavity looses 50ppm every roundtrip other than the transmission
losses. With the updated arm cavity loss:
PRFPMI |
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Fri Jan 14 18:12:47 2022, Anchal, Summary, BHD, AS4 placed in ITMY Chamber, OSEMs connected
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AS4 was succesfully suspended and trasported to ITMY chamber (40m/16589). We placed it near
the door to make it easy to tune the OSEMs. We connected the OSEMs and found that the LL OSEM is not responding. Even though the the OSEMs
are completely out right now, there was no signal on this OSEM. This could be an issue in either at the LED driver circuit or the PD circuit in AS4 Sat |
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Tue Jan 18 18:16:28 2022, Anchal, Summary, BHD, Part IV of BHR upgrade - SR2 Sat Amp Box inspection
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I tested the monitor ports on the SR2 Sat Amp Box but found that all LED Mon and PD Mon are giving expected
values. I disconnected the cable to OSEM and checked the PD monitors and found no offsets in case of no PD current. I realised that PD transimpedance offset
should be checked with PD inputs shorted instead. So I created a male DB 25 connector with pinds 2-3, 50-6, 8-9 and 11-12 shorted. This on connecting to |
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Wed Jan 19 12:50:10 2022, Anchal, Summary, BHD, Part IV of BHR upgrade - SR2 OSEM tuning progress.
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It was indeed the issue of the top OSEM plate not being in the right place horizontally. But the issue was more non-trivial. I believe because of the
wedge in thick optics, there is a YAW offset in the optic in the free hanging position. I had to readjust the OSEM plate 4 times to be able to get full
dark to bright range in both upper OSEMs. After doing that, I tuned the four OSEMs somewhat near the halfway point and once I was sure I'm inside the |
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Wed Jan 19 16:22:48 2022, Anchal, Update, BHD, PR2 transmission calculation updated
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I have further updated my calculation. Please find the results in the attached pdf.
Following is the description of calculations done:
Arm cavity reflection:
Reflection fro arm cavity is calculated as simple FP cavity reflection formula while |
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Thu Jan 20 17:03:36 2022, Anchal, Summary, BHD, Part IV of BHR upgrade - SR2 OSEM tuned.
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The main issue with SR2 OSEMs, now that I think of it, was that the BS table was very inclined due to the multiple things we removed (including counterweights).
Today the first I did was level the BS table by placing some counterweights in the correct positions. I placed the level in two directions right next to
SR2 (clamped in its planned place), and made the bubble center. |
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Thu Jan 20 18:16:29 2022, Anchal, Update, BHD, AS4 set to trigger free swing test
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AS4 is set to go through a free swinging test at 10 pm tonight. We have used this script (Git/40m/scripts/SUS/InMatCalc/freeSwing.py)
reliably in the past so we expect no issues, it has a error catching block to restore all changes at the end of the test or if something goes wrong.
To access the test, on allegra, type: |
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Thu Jan 20 18:41:55 2022, Anchal, Summary, BHD, SR2 set to trigger free swing test
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SR2 is set to go through a free swinging test at 3 am tonight. We have used this script (Git/40m/scripts/SUS/InMatCalc/freeSwing.py)
reliably in the past so we expect no issues, it has a error catching block to restore all changes at the end of the test or if something goes wrong.
To access the test, on allegra, type: |
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Fri Jan 21 11:24:42 2022, Anchal, Summary, BHD, SR2 Input Matrix Diagonalization performed.
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The free swinging test was successful. I ran the input matrix diagonalization code (/opt/rtcds/caltech/c1/Git/40m/scripts/SUS/InMAtCalc/sus_diagonalization.py)
on theSR2 free-swinging data collected last night. The logfile and results are stored in /opt/rtcds/caltech/c1/Git/40m/scripts/SUS/InMAtCalc/SR2
directory. Attachment 1 shows the power spectral density of the DOF basis data (POS, PIT, YAW, SIDE) before and after the diagonalization. Attachment 2 |
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Fri Jan 21 16:40:10 2022, Anchal, Update, BHD, AS4 Input Matrix Diagonalization performed.
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The free swinging test was successful. I ran the input matrix diagonalization code (/opt/rtcds/caltech/c1/Git/40m/scripts/SUS/InMAtCalc/sus_diagonalization.py)
on the AS4 free-swinging data collected last night. The logfile and results are stored in /opt/rtcds/caltech/c1/Git/40m/scripts/SUS/InMAtCalc/AS4
directory. Attachment 1 shows the power spectral density of the DOF basis data (POS, PIT, YAW, SIDE) before and after the diagonalization. Attachment 2 |
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Mon Jan 24 18:53:09 2022, Anchal, Summary, BHD, Part VIII of BHR upgrade - LO2 placed and OSEMs tuned
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I placed LO2 in its planned position in BS chamber, inserted the OSEMs, and tuned their position to halfway brightness. At the end of the work, I was
able to damp the optic successfully. The full open (full brightness) OSEM ADC counts are:
UL 25743. -> 12876 |
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Mon Jan 24 20:48:48 2022, Anchal, Update, BHD, AS4 Input Matrix Diagonalization performed.
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I agree. That's an interesting idea. But does that mean that there is an always working inverse matrix solution or that any solution will be vulnerable
to the alignment biases.
I think we can also calculate the matrix rotation required as a function of dc biases and do that rotation in the simulimk model. |
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Tue Jan 25 10:55:02 2022, Anchal, Summary, BHD, Part VIII of BHR upgrade - LO2 input matrix diagonalization performed.
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The free swinging test was successful. I ran the input matrix diagonalization code (/opt/rtcds/caltech/c1/Git/40m/scripts/SUS/InMAtCalc/sus_diagonalization.py)
on the LO2 free-swinging data collected last night. The logfile and results are stored in /opt/rtcds/caltech/c1/Git/40m/scripts/SUS/InMAtCalc/LO2
directory. Attachment 1 shows the power spectral density of the DOF basis data (POS, PIT, YAW, SIDE) before and after the diagonalization. Attachment 2 |
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Tue Jan 25 11:02:54 2022, Anchal, Summary, BHD, Part IX of BHR upgrade - AS1 free swing test failed
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For some reasonf the free swing test showed only one resonance peak (see attachment 1). This probably happened because one of the earthquake stops is
touching the optic. Maybe after the table balancing, the table moved a little over its long relazation time and by the time the free swing test was performed
at 3 am, one of the earthquake stops was touching the optic. We need to check this when we open the chamber next. |
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Tue Jan 25 16:42:03 2022, Anchal, Summary, BHD, Reduced filter gains in all damped new SOS
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I noticed that our current suspension damping loops for the new SOS were railing the DAC outputs. The reason being that cts2um module has not been updated
for most optics and thus teh OSEM signal (with the new Sat Amps) is about 30 times stronger. That means our usual intuition of damping gains is too high
without applying correct conversion cts2um filter module. I reduced all these gains today and nothing is overflowing the c1su2 chassis now. I also added |
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Thu Jan 27 17:57:35 2022, Anchal, Summary, BHD, Part III of BHR upgrade - Replaced small suspended PR3 with new SOS PR3 and OSEM tuning
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[Anchal, Paco]
We removed the old PR3 housed in a tip-tilt style suspension and put it on the North flow bench in the cleanroom. I put PR3 in an accessible
position near the North West edge of the BS chamber and balanced the table again with many weights. The OSEM tuning was very uneventful and easy. Following |
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Fri Jan 28 16:35:18 2022, Anchal, Summary, BHD, AS1, PR2 and PR3 set to trigger free swing test
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AS1, PR2 and PR3 are set to o go through a free swinging test at 3 am. We have used this script (Git/40m/scripts/SUS/InMatCalc/freeSwing.py)
reliably in the past so we expect no issues, it has a error catching block to restore all changes at the end of the test or if something goes wrong.
To access the test, on allegra, type: |
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Wed Feb 2 16:22:00 2022, Anchal, Summary, BHD, Part III of BHR upgrade - PR2 inpute matrix diagonalized
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The free swinging test was successful. I ran the input matrix diagonalization code (/opt/rtcds/caltech/c1/Git/40m/scripts/SUS/InMAtCalc/sus_diagonalization.py)
on the PR2 free-swinging data collected last night. The logfile and results are stored in |
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Wed Feb 2 16:27:57 2022, Anchal, Summary, BHD, Part III of BHR upgrade - PR3 inpute matrix diagonalized
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The free swinging test was successful. I ran the input matrix diagonalization code (/opt/rtcds/caltech/c1/Git/40m/scripts/SUS/InMAtCalc/sus_diagonalization.py)
on the PR3 free-swinging data collected last night. The logfile and results are stored in |
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Wed Feb 2 16:32:02 2022, Anchal, Summary, BHD, Part IX of BHR upgrade - AS1 free swing test still not good
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We still did not get a good AS1 free swinging spectrum. It seems the Side OSEM is reporting coupling to too many DOFs and some extra resonances than
we expect. So we did not upload the new input matrix calculated from this test. I'm attaching teh peak fitting (attachment 1) and the diagonalization
attempt (attachment 2) to give some idea of what happened. Note how different this fre swinging spectrum looks from the other optics. |
 Fri Feb 4 10:21:39 2022, Anchal, Summary, General, Complete lab shutdown
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Please edit this same entry throughout the day for the shutdown elogging.
I took a screenshot of C0VAC_MONITOR.adl to ensure that all pnematic valves are in closed positions:
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Wed Feb 9 11:56:24 2022, Anchal, Update, General, Bringing back CDS
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[Anchal, Paco]
Bringing back CDS took a lot of work yesterday. I'm gonna try to summarize the main points here.
mx_start_stop
For some reason, fb1 was not able to mount mx devices automatically on system boot. This was |
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Thu Feb 10 15:41:00 2022, Anchal, Update, General, Scheduled power outage recovery - Locking mode cleaner(s)
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I found out that the ESP300 service needs to be run in root mode for it to be able to connect to the USB port of HWP motor controller. While doing this
change, I noticed that the channels hosted by c1psl might have a duplication conflict with some other channel hosting computer, because a lot of them show
the Warning: "Identical process variable names on multiple servers" which is not good. Someone should look into this conflict. |
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Thu Feb 10 17:57:48 2022, Anchal, Update, General, Scheduled power outage recovery - Locking mode cleaner(s)
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Something is wrong with the Video MUX. The system did not turn back on with full functionality. Even though we see the screens as they were before the
power shutdown, we have lost control on switching any of the videos. I went to check the wiki
page about Video MUX which told be we should be able to see the configuration screen on this link, but the page |
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Fri Feb 11 10:56:38 2022, Anchal, Update, CDS, [Solved] Huge random numbers flowing into ETMX/ETMY ASC PIT/YAW
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Yeah, this is a known issue actually. We go to ASC screen and manually swich off all the outputs after every reboot. We haven't been able to find
a way to set default so that when the model comes online, these outputs remain switched off. We should find a way for this.
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Fri Feb 11 11:17:00 2022, Anchal, Update, General, Scheduled power outage recovery
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I found that two computers are not powering up in the control room, Ottavia and Allegra. Allegra was important for us as it had the current version of
LIGO CDS workstation installed on, providing us with options to use latest packages written by LIGO CDS team. I think the power issue should be resolvable
if someone opens it and knows what thye are doing. Do we have any way of getting fuse repairs on such computers? Both these computers are Dell XPS 420. |
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Fri Feb 11 16:09:11 2022, Anchal, Update, General, Scheduled power outage recovery - Input power increased
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We increased the input power to IMC by replacing the 98% transmission BS by a 10% transmission BS on the detection table (reverse of what mentioned in
40m/16408 see attachment 8-9). We then realigned the BS so that MC RFPD is centered. Then we realigned two steering mirrors to get the beam centered on |
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Fri Feb 11 17:07:19 2022, Anchal, Update, CDS, [Solved] Huge random numbers flowing into ETMX/ETMY ASC PIT/YAW
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The autoBurt file for FE already has the C1:ASC-ETMX_PIT_SW2 (and other channels for ETMY, ITMX, ITMY, BS and for YAW) present, and I checked the last
snapshot file from Feb 7th, 2022, which has 0 for these channels. So I'm not sure why when FE boots up, it does not follow the switch configuration.
Fr safety, I changed all the gains of these filter modules, named like C1:ASC-XXXX_YYY_GAIN (where XXXX is ETMX, ETMY, ITMX, ITMY, or BS , and YYY is PIT |
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Wed Feb 16 15:19:41 2022, Anchal, Update, General, Reconfigured MC reflection path for low power
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I reconfigured the MC reflection path for low power. This meant the following changes:
Replaced the 10% reflection BS by 98% reflection beam splitter
Realigned the BS angle to get maximum on C1:IOO-MC_RFPD_DCMON
when cavity is unlocked.
Then realigned the steering mirrors for WFS1 and WFS2.
I tried to align the light for MC reflection CCD |
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Wed Feb 23 15:08:57 2022, Anchal, Update, General, Removed extra beamsplitter in MC WFS path
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| As discussed in the meeting, I removed the extra beam splitter that dumps most of the beam going towards WFS photodiodes. This beam splitter needs to be placed back in position before increasing the input power to IMC at nominal level. This is to get sufficient light on the WFS photodiodes so that we can keep IMC locked for more than 3 days. Currently IMC is unlocked |
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Thu Feb 24 14:32:57 2022, Anchal, Update, General, MC RFPD DCMON channel got stuck to 0
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I found a peculiar issue today. The C1:IOO-MC_RFPD_DCMON remains constantly 0. I wonder if the RFPF output is being read properly. I opened the table
and used an oscilloscope to confirm that the DC output from the MC REFL photodiode is coming consistently but our EPICs channel is not reading it. I tried
restarting the modbusIOC service but that did not affect anything. I power cycled the acromag chassis while keeping the modbusIOC service off, and then |
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Thu Feb 24 19:26:32 2022, Anchal, Update, General, IMC Locking
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I think I have aligned the cavity, including MC1 such that we are seeing flashing of fundamental mode and significant transmission sum value as well.However,
I'm unable to catch lock following Koji's method in 40m/16673. Autolocker could not
catch lock either. Maybe I am doing something wrong, I'll pickup again tomorrow, hopefully the cavity won't drift too much in this time. |
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Thu Mar 3 15:37:40 2022, Anchal, Summary, CDS, c1teststand restructured
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c1teststand has been restructured. There is no port computer called 'c1teststand' anymore. When you ssh into the c1teststand network using ssh
c1teststand from inside martian or from outside network using the method mentioned in this wiki
page , you would land into chiara (clone) computer and you can navigate into any teststand network computer from there. |
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Fri Mar 4 11:04:34 2022, Anchal, Summary, CDS, c1susaux2 system setup and running
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I took the c1teststand computer from teststand and converted it into c1susaux2. To do so, I installed a fresh copy of debian 10 on it and followed the
steps on this wiki page. I did some parts slightly differently though. The directory /cvs/cds/caltecg/c1susaux2
is a repository and contains the service unit file modbusIOC.service |
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Mon Mar 7 19:38:47 2022, Anchal, Summary, CDS, c1susaux2 slow controls issues
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I tried to perform a simple enabling test of coils using c1susaux2 modbus channels but failed. I'm able to do the enabling of coils using the windows
GUI of acromag card but I can not do it when the cards are connected to the computer subnetwork. The issue is two-fold:
The enable channels such as C1:SUS-LO1_UL_ENABLE are not changing values when their DOL changes a value. In this case, I created a calc |
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Mon Mar 14 12:20:05 2022, Anchal, Summary, CDS, c1susaux2 slow controls acromag chassis installed
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[Anchal, Yehonathan, Ian]
We installed c1susaux2 acromag chassis in 1Y0 with c1susaux2 computer. We connected PD monitors, Binary inputs, Binary outputs, and Run/Acquire
RTS signals for 6 of the 7 suspensions. We ran out of DB9 cables to connect PR3. Of the ones that were connected, LO2, AS1, AS4, SR2, and PR2 are showing |
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Tue Mar 15 11:52:34 2022, Anchal, Summary, CDS, c1su2 model updated for sending Run/Acquire Binary Output to Binary Interface card
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I routed the XXX_COIL_DW signals from the 7 SOS blocks in c1su2.mdl (located at /cvs/cds/rtcds/userapps/trunk/sus/c1/models/c1su2.mdl) to the binary
outputs from the FE model. The routing is done such that when these binary outputs are routed through the binary interface card mounted on 1Y0, they go
to the acromag chassis just installed and from there they go to the binary inputs of the coil drivers together with the acromag controlled coil outputs. |
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Tue Mar 15 14:10:41 2022, Anchal, Summary, CDS, c1su2 model remade, reinstalled, restarted after the update
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I have restarted c1su2 model with the connections of Run Acquire switch to analog filters on coil drivers. Following steps were taken:
First ssh to c1sus2 and then:
controls@c1sus2:~ |
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Tue Mar 15 18:42:37 2022, Anchal, Summary, BHD, Part IX of BHR upgrade - AS1 resuspended and OSEMs tuned
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http://nodus.ligo.caltech.edu:8080/40m/16722
http://nodus.ligo.caltech.edu:8080/40m/16716 |