 Tue May 3 14:02:09 2022, Anchal, Summary, BHD, Installed POP path in ITMX Chamber
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[Anchal, JC]
I installed POP_SM4 and POP_SM5 in the ITMX chamber in the nominal positions. This must have affected the ITMX Oplev because I could see that
one of the ITMX oplev beam was going through POP_SM5. It needs to be changed in order to follow the original plan. However, since POP_SM5 is a 1064 line |
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Wed May 4 13:09:42 2022, Anchal, Update, BHD, IMC table balanced again, IMC is locking, YARM is locking
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[Paco, JC, Anchal]
We balanced the IMC table back again to point that got us 50% of nominal transmission from IMC. Then we tweaked the steering mirror for injection
to IMC to get up to 90% of nominal transmission. Finally, we used WFS servo loop to get to the 100% nominal transmission from IMC. However, we found that |
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Thu May 5 14:46:22 2022, Anchal, Update, BHD, POP beam height lowered, POP_SM4 raised
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[Anchal, JC]
We first aligned the single arm cavity resonance for both arms to get maximum flashing. As we opened the chamber, I found that the POP beam was
mostly hitting the POP_SM4 mirror but was clipping about 2 mm on the top edge. |
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Fri May 6 13:48:34 2022, Anchal, Update, BHD, WFS loop instability fixed
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[Yuta, Anchal]
We investigated why WFS loop wasn't working. It seemed like WFS1 PIT error signal has a huge offset which would push the loop to misalign
all optics' PIT. So we did the following steps: |
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Mon May 9 18:43:03 2022, Anchal, Update, BHD, ITMX table layout corrected
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As I went to correct the ITMX Oplev mirrors, I found that both mirrors were placed in very different positions than the design position. Part of the
reason I think was to preserve outside oplev path, and party because a counterweight was in ITMXOL1 position. I had to do following steps to correct this:
I noted down level meter readings of the table before making any changes.
I removed the counter weight from near the center |
Thu May 12 20:11:18 2022, Anchal, Update, BHD, BHDBS Output beams steered out to ITMY table 
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I successfully steered out the two output beams from BHD BS to ITMY table today. This required significant changes on the table, but I was able to bring
back the table to balance coarsely and then recover YARM flashing with fine tuning of ITMY.
The counterweights were kept at the North end of the table which was in way of one of the output beams of BHD.
So I saved |
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Mon May 16 10:49:01 2022, Anchal, Update, DAQ, DAQ troubleshooting
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[Anchal, Paco, JC]
Thanks Chris for the fix. We are able to access the testpoints now but we started facing another issue this morning, not sure how it is related
to what you did. |
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Mon May 16 19:14:17 2022, Anchal, Update, BHD, Camera set on AS path and BHDBS output path
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[Anchal, Paco, Yuta]
We aligned AS path avoiding any clipping to the AP table where we setup a camera with a lens.
To do this we had to move
AS6 in North direction for ~1cm.
The Injection table was imbalanced by this move to drop the IMC transmission to half.
We did not |
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Tue May 17 18:43:38 2022, Anchal, Update, BHD, Placed SRM in ITMY Chamber
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[Anchal, Paco, Yuta]
SRM Placement
SRM was moved from its parked location to the nominal position in the ITMY chamber.
This
imbalanced the table a lot as all SOS towers ended up on the south side of the table.
I needed additionally three SOS tower side walls to recover |
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Wed May 18 09:02:52 2022, Anchal, Update, BHD, WFS1 PD centered
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I centered WFS1 PD so that IMC WFS Servo does not go out of range.
|
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Wed May 18 17:23:15 2022, Anchal, Update, BHD, Placed PRM in BS Chamber
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[Anchal, Paco, Yuta, JC]
SRM Oplev setup
We setup SRM oplev path for the aligned position of SRM.
This was bit hard, because
the return beam was following almost the same path as the input beam, and the return beam had become about 1 cm in diameter.
We replaced one |
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Thu May 19 19:05:59 2022, Anchal, Update, BHD, BS Chamber all work finished, BHD path setup
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[Anchal, Paco, Yuta]
BS Oplev Path
The changed position of PRM (40m/16863)
meant that BS oplev path is getting clipped by the PRM SOS tower.
We had to move BSOL ~ 16 cm North and ~ 1.7 cm East.
This means |
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Tue May 24 15:21:13 2022, Anchal, Update, BHD, Freeswing tests of new SOS started
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I modified the script freeSwing.py to use damping loop output switches
to free the optic instead of watchdog or coil output filters. This ensures that the free swing test is being done at the nominal position of the optic.
I started tests for LO1, LO2, As2, As4, PR2, PR3, and SR2 in a tmux session names freeSwing on rossa. |
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Tue Jun 7 19:40:45 2022, Anchal, Update, SUS, ITMY changed output matrix to disable use of UL coil
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Since UL coil actuation is lost, we modified the output matrix of ITMY to use only UR, LR and LL face coils for POS, PIT and YAW actuation. The output
matrix was changed to following:
POS
PIT
YAW
SIDE
UL
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 Tue Jun 14 18:45:43 2022, Anchal, Update, SUS, LO2 lower magnets are stuck in coil, won't come off
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[Anchal, Yuta]
In the weekend, I ran a free swing test on all optics. During this test, LO2 magnets got stuck to the coil because LO2 PIT alignment was very
high, making its lower OSEMs almost fully dark and upper OSEMs almost fully bright. Today we realized that LO2 |
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Tue Jun 14 20:57:15 2022, Anchal, Update, ASC, Yarm ASS working now
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I finally got YARM AS to work today. It is hard to describe what worked, I did a lot of monkey business and some dirty offset measurements to create
the ASS output matrix that gave results. Note that I still had to leave out ITMY PIT L error signal, but transmission was maximizing without it. The beam
does not center fully on ITMY in Pit direction right now, but we'll mvoe on from this problem for now. Future people are welcome to try to make it |
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Thu Jun 16 18:30:07 2022, Anchal, Update, SUS, New diagonalized input matrices applied
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I used the same fre swing data to diagnolize input matrices of following optics:
MC1, MC2, MC3
BS ETMX ETMY |
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Tue Jun 21 08:36:50 2022, Anchal, Update, SUS, Diagonalized input matrices for LO1, freeSwing on ITMY and ITMX
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Over the weekend, I ran freeSwing test with sequential kicks in specific DOFs for LO1, ITMY, ITMX. LO1 results were successfully used to diagonalize
LO1 input matrix. There are some issues for ITMY, ITMX still. I could not run LO2 test.
LO1
The free swing test ran successfully, resonant frequencies for different DOFs was extracted, and new |
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Wed Jun 22 14:44:03 2022, Anchal, Update, BHD, Fixed DC error in c1su2, added new library model for suspensions
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The 0x2000 error in c1su2 happens whenever we make it and install it as the default data acquisition rates are too much in the suspension model. Earlier
we used activateSUS2DQ.py to fix this. I followed the suggestion in 40m/16537 to include COIL_OUT
at 16k, damping channels at 256 Hz and OL channels at 1024 Hz. I created new suspension model at /cvs/cds/rtcds/userapps/trunk/sus/c1/models/lib/sus_single_control_new.mdl. |
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Sat Jun 25 14:29:48 2022, Anchal, Update, IOO, WFS issues
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This issue is very weird and still unresolved. Without WFS loops, we'll have to realign IMC often and we might loose IMC alignment completely during
weekends or long weekends.
I tried following things today but nothign worked: |
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Tue Jun 28 17:07:47 2022, Anchal, Update, Calibration, Added Beatnote channels in demodulation of c1cal
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I added today demodulation of C1:LSC-BEATX/Y_FINE_I/Q in the c1cal demodulation where different degrees of freedom can be dithered. For McCal (formerly
soCal), we'll dither the arm cavity for which we can use any of the DOFs (like DARM) to send the dither to ETMX/ETMY. Then with green laser locked
as well, we'll get the calibration signal from the beatnotes in the demodulaed channels. We can also read right after the mixing in c1cal model and |
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Mon Jul 18 04:42:54 2022, Anchal, Update, Calibration, Error propagation to astrophysical parameters from detector calibration uncertainty
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We can calculate how much detector calibration uncertainty affects the estimation of astrophysical parameters using the following method:
Let be set of astrophysical
parameters (like component masses, distance etc), |
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Mon Jul 18 21:41:42 2022, Anchal, Summary, LSC, FPMI locking procedure using REFL55 and AS55
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Now that you have found a working configuration, I suggest we update CARM and DARM filter banks so that they are used in locking those degrees of freedom
instead of repurposing XARM/YARM banks. It would be bit easier to understand and leaves room for future changes for one configuration while keeping single
arm lock configurations untouched. |
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Tue Jul 19 07:34:46 2022, Anchal, Update, Calibration, Error propagation to astrophysical parameters from detector calibration uncertainty
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Addressing the comments as numbered:
Yeah, that's correct, that equation normally but it is different if I define bit differently that I did in the code, correct |
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Thu Jul 28 20:16:26 2022, Anchal, Update, BHD, Shaking test for LO beam AS beam to BHD DCPDs
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Some insights from the inside vacuum situation:
The beam is an incident near normal on PR2 close to the center of the optic. It wasn't hard to align this part, I'm very confident
that we aligned it to the center of PR2. So I do not think the LO beam is ghost beam from PR2.
The place that is most susceptible to clipping |
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Sat Jul 30 10:38:12 2022, Anchal, Update, PSL, FSSSlow/MCAutolocker issue (docker)
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The FSSSlow script was not properly documented and it was not working, so I had to use one that I knew worked from CTN. This scripts lives in
/opt/rtcds/caltech/c1/Git/40m/scripts/PSL/FSS/PIDLocker.py
and uses a configuration file |
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Thu Aug 4 11:28:22 2022, Anchal, Update, PSL, FSSSlow/MCAutolocker issue (docker)
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Added C1:IOO-MC_LOCK to ALConfigMC.yml which solved
the isse with FSS Slow. We should tune the FSS Slow Servo PID coefficients for a better performance.
the C1PSL_SLOW.adl screen is not obsolete. It can be used to change the PID coefficients, engage/disengage the PID loop, monitor the PID script |
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Mon Aug 15 15:43:49 2022, Anchal, Update, General, Complete power shutdown and startup documentation
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All steps taken have been recorded here:
https://wiki-40m.ligo.caltech.edu/Complete_power_shutdown_2022_08 |
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Mon Aug 15 18:06:07 2022, Anchal, Update, General, c1vac issues, 1 pressure gauge died
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[Anchal, Paco, Tega]
Disk full issue:
c1vac was showing /var disk to be full. We moved all gunzipped backup logs to /home/controls/logBackUp.
This emptied 36% of space on /var. Ideally, we need not log so much. Some solution needs to be found for reducing these log sizes or monitoring them for |
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Fri Aug 19 14:46:32 2022, Anchal, Update, SUS, Open loop transfer function measurements for local damping loops of BHD optics
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[Anchal, Tega]
As a first step to characterize all the local damping loops, we ran an open loop transfer function measurement test for all BHD optics, taking
transfer function using band-limited (0.3 Hz to 10 Hz) gaussian noise injection at error points in different degrees of freedom. Plots are in the git repo. |
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Sat Aug 20 20:26:10 2022, Anchal, Update, SUS, Open loop transfer function measurements for local damping loops of Core optics
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I made measurements of old optics OLTF today. I have reduced the file sizes of the plots and data now. It is interesting that it is allowed to read 9
channels simultaneously from c1mcs or c1sus models, even together. The situation with c1su2 is a bit unclear. I was earlier able to take measurements of
6 channels at once from c1su2 but not I can't read more than 1 channel simultaneously. This suggests that the limit is dictated by how much a single |
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Fri Sep 2 15:30:10 2022, Anchal, Update, General, Along the X arm part 1
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[Anchal, Radhika]
Attachment 2: The custom cables which were part of the intermediate setup between old electronics architecture and new electronics
architecture were found. |
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Fri Sep 2 15:35:19 2022, Anchal, Update, General, Along the Y arm part 2
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[Anchal, Radhika]
The cables in USPS open box were important cables that are part of the new electronics architecture. These are 3 ft D2100103 DB15F to DB9M Reducer
Cable that go between coil driver output (DB15M on back) to satellite amplifier coil driver in (DB9F on the front). These have been placed in a separate |
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Fri Sep 2 15:40:25 2022, Anchal, Summary, ALS, DFD cable measurements
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[Anchal, Yehonathan]
I laid down another temporary cable from Xend to 1Y2 (LSC rack) for also measuring the Q output of the DFD box. Then to get a quick measurement
of these long cable delays, we used Moku:GO in oscillator mode, sent 100 ns pulses at a 100 kHz rate from one end, and measured the difference between |
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Wed Sep 7 14:32:15 2022, Anchal, Update, SUS, Updated SD coil gain to keep all coil actuation signals digitally same magnitude
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The coil driver actuation strength for face coils was increased by 13 times in LO1, LO2, SR2, AS1, AS4, PR2, and PR3.
After the change the damping strenghth of POS, PIT, and YAW were reduced, but not SIDE coil output filter module requires higher digital input
to cause same force at the output. This wouldn't be an issue until we try to correct for cross coupling at output matrix where we would want to give |
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Thu Sep 15 11:13:32 2022, Anchal, Summary, ASS, YARM and XARM ASS restored
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With limited proof of working for a few times (but robustly), I'm happy to report that ASS on YARM and XARM is working now.
What is wrong?
The issue is that PR3 is not placed in correct position in the chamber. It is offset enough
that to send a beam through center of ITMY to ETMY, it has to reflect off the edge of PR3 leading to some clipping. Hence our usual ASS takes us to this |
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Tue Sep 20 18:18:07 2022, Anchal, Summary, SUS, ETMX, ETMY damping loop gain tuning
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[Paco, Anchal]
We performed local damping loop tuning for ETMs today to ensure all damping loops' OLTF has a Q of 3-5. To do so, we applied a step on C1:SUS-ETMX/Y_POS/PIT/YAW_OFFSET,
and looked for oscillations in the error point of damping loops (C1:SUS-EMTX/Y_SUSPOS/PIT/YAW_IN1) and increased or decreased gains until we saw 3-5 oscillations |
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Thu Sep 22 19:51:58 2022, Anchal, Update, BHD, BH55 LSC Model Updates - part II
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I updated follwoing in teh rtcds models and medm screens:
c1lsc
Added reading of ADC0_20 and ADC0_21 as demodulated BHD output at 55 MHz, I and Q channels.
Connected
BH55_I and BH55_Q to phase rotation and creation of output channels.
Replaced POP55 with BH55 in the RFPD input matrix.
Send BH55_I |
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Fri Sep 23 19:04:12 2022, Anchal, Update, BHD, BH55 LSC Model Updates - part III
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BH55
I further updated LSC model today with following changes:
BH55 whitening switch binary output signal is now routed to correct place.
Switching FM1 which carries dewhitening digital
filter will always switch on corresponding analog whitening before ADC input.
The whitening can be triggered using LSC trigger |
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Thu Sep 29 18:01:14 2022, Anchal, Update, BHD, BH55 LSC Model Updates - part IV
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More model changes
c1lsc:
BH55_I and BH55_Q are now being read at ADC_0_14 and ADC_0_15. The ADC_0_20 and ADC_0_21 are bad due to faulty whitening filter board.
The
whitening switch controls were also shifted accordingly.
the slow epics channels for BH55 anti-aliasing switch and whitening switch were added |
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Fri Sep 30 18:30:12 2022, Anchal, Update, ASS, Model Changes
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I updated c1ass model today to use PR2 PR3 instead of TT1 TT2 for YARM ASS. This required changes in c1su2 too. I have split c1su2 into c1su2 (LO1.,
LO2, AS1, AS4) and c1su3 (SR2, PR2, PR3). Now the two models are using 31 and 21 CPU out of 60 which was earlier 55/60. All changed compiled correctly
and have been uploaded. Models have been restared and medm screens have been updated. |
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Sat Oct 1 13:09:49 2022, Anchal, Update, IMC, WFS turned on
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I turned on WFS on IMC at:
PDT: 2022-10-01 13:09:18.378404 PDT
UTC: 2022-10-01 20:09:18.378404 UTC |
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Thu Oct 6 11:12:14 2022, Anchal, Update, BHD, BH55 RFPD installation complete
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[Yuta, Paco, Anchal]
BH55 RFPD installation was still not complete until yesterday because of a peculiar issue. As soon as we would increase the whitening gain on
this photodiode, we saw spikes coming in at around 10 Hz. Following events took place while debugging this issue: |
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Thu Oct 6 12:02:21 2022, Anchal, Update, CDS, CDS Upgrade Plan
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[Chris, Anchal]
Chris and I discussed our plan for CDS upgrade which amounts to moving new FEs, new chiara, and new FB1 OS system tomartian network.
Preparation:
Chiara (clone) (will be called "New Chiara" henceforth) will be resynced |
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Thu Oct 6 18:50:57 2022, Anchal, Summary, BHD, BH55 meas diff angle estimation and LO phase lock attempts
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[Yuta, Paco, Anchal]
BH55 meas diff
We estimated meas diff angle for BH55 today by following this elog
post. We used moku:lab Moku01 to send a 55 MHz tone to PD input port of BH55 demodulation board. Then we looked at I_ERR and Q_ERR signals. We balanced |
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Fri Oct 7 22:45:15 2022, Anchal, Update, CDS, CDS Upgrade Status Update
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[Chris, Anchal, JC, Paco, Yuta]
Quote:
Steps: |
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Tue Oct 11 16:52:42 2022, Anchal, Update, IOO, Renaming WFS channels to match LIGO site conventions
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[Tega, Anchal]
c1mcs and c1ioo models have been updated to add new acquisition of data.
IOO:WFS channels
We found from https://ldvw.ligo.caltech.edu/ldvw/view |
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Mon Oct 17 20:04:16 2022, Anchal, Update, BHD, BH55 RF output amplified
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[Radhika, Anchal]
We have added an RF amplifier to the output of BH55. See the MICH signal on BH55 outputs as compared to AS55 output on the attached screenshot.
|
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Tue Oct 18 20:43:38 2022, Anchal, Update, Optimal Control, IMC open loop noise monitor
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WFS loops were running for past 2 hours when I made the overall gain slider zero at:
PDT: 2022-10-18 20:42:53.505256 PDT
UTC: 2022-10-19 03:42:53.505256 UTC |
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Wed Oct 19 09:48:49 2022, Anchal, Update, Optimal Control, IMC open loop noise monitor
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Turning WFS loops back on at:
PDT: 2022-10-19 09:48:16.956979 PDT
UTC: 2022-10-19 16:48:16.956979 UTC |