Mon Feb 25 21:25:14 2013, yuta, Update, Alignment, both arms locked in IR
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[Jenne, Evan, Yuta]
After Y alignment, X arm is aligned to IR and we got both arms locked in IR. |
Mon Feb 25 22:42:32 2013, yuta, Summary, Alignment, current IFO situation
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[Jenne,Yuta]
Both arms are aligned starting from Y green. |
Wed Feb 27 01:09:53 2013, yuta, Update, Locking, PRMI sideband/carrier locked 6x
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[Jenne,Yuta]
We succeeded in locking PRMI in sideband and carrier. |
Wed Feb 27 11:22:54 2013, yuta, Update, Computers, backup crontab
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I made a simple script to backup crontab (/opt/rtcds/caltech/c1/scripts/crontab/backupCrontab).
#!/bin/bash |
Wed Feb 27 11:59:43 2013, yuta, Update, SUS, PRM/BS coil re-balanced 
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I re-adjusted coil gains and f2a filters for PRM and BS.
I'm not sure what happened to PRM since I balanced on Feb 16(elog #8093).
Let's see if it helps PRMI locking or not. |
Thu Feb 28 02:43:49 2013, yuta, Update, LSC, some qualitative evidence of PRMI sideband lock
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[Manasa, Yuta]
Since we have setup POP22 PD now(elog #8192), we could confirm that sideband power builds |
Thu Feb 28 03:25:27 2013, yuta, Update, LSC, PR gain ~ 25 from PRMI carrier lock
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[Manasa, Yuta]
We locked PRMI in carrier. Measured power recycling gain was ~25. |
Thu Feb 28 05:54:54 2013, yuta, Update, RF System, phase tracker: calibration 
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I swept the frequency of RF input to the beatbox to calibrate and check linearity range of phase tracker.
Calibration factors are;
C1:ALS-BEATX_FINE_PHASE_OUT 52.1643 +/- 0.0003 deg/MHz |
Thu Feb 28 06:51:17 2013, yuta, Update, RF System, phase tracker: noise level
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I measured noise level of the phase tracker by inputting constant frequency RF signal from marconi.
Measured frequency noise was ~2 Hz/rtHz @ 100 Hz. It's not so good.
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Fri Mar 1 16:58:37 2013, yuta, Update, LSC, Xarm oscillation stopped
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POX11 oscillation at 630 Hz was stopped by installing 630 Hz resonant gain to LSC_XARM.
After few hours, oscillation stopped. So I removed the resonant gain.
Our guess is that 630 Hz peak is some violin mode or something, and it was excited somehow, and didn't stopped for very long time because of its |
Sat Mar 2 05:53:15 2013, yuta, Update, LSC, stable lock of PRMI  
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I tuned alignment, gains and filters to achieve stable lock of PRMI.
It now locks quite stably with UGF of ~100 Hz. Measured power recycling gain at maximum is ~ 25.
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Sat Mar 2 20:09:12 2013, yuta, Update, RF System, phase tracker: DAQ noise limited
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[Koji, Yuta]
We found that our phase tracker noise is currently limited by the noise introduced in DAQ. |
Mon Mar 4 16:46:31 2013, yuta, Update, SUS, oplev calibration for PRM 
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[Manasa, Sendhil, Yuta]
We calibrated oplev for PRM. Calibration factor for C1:SUS-PRM_OL(PIT|YAW)_IN1 are; |
Mon Mar 4 17:32:26 2013, yuta, Bureaucracy, General, flowchart for PRMI g-factor measurement
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I made a very useful flowchart for the week. Our goal for the week is to measure g-factor of PRC in PRMI.
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Tue Mar 5 06:27:14 2013, yuta, Update, LSC, intra-cavity power dependence on mirror misalignment   
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I measured intra-cavity power dependance on mirror misalignment.
Intra-cavity power of PRC in PRMI degrates roughly 20 % when there's 0.5 mrad 5 urad
misalignment. (edited by YM) |
Tue Mar 5 17:09:30 2013, yuta, Update, SUS, oplev calibration for ITMY 
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[Manasa, Sendhil, Yuta]
We calibrated oplev for ITMY. Calibration factor for C1:SUS-ITMY_OL(PIT|YAW)_IN1 are; |
Tue Mar 5 23:00:08 2013, yuta, Update, LSC, Yarm and PRC g-factor from misalignment measurement  
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I fitted intra-cavity power dependance on mirror misalignment plot with parabola to get the g-factor.
Y arm (tangential) g = 0.44 +0.01 -0.01 (measured value before was 0.3765 +/- |
Tue Mar 5 23:37:11 2013, yuta, Update, SUS, PRM angular motion spectra
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I measured PRM angular motion spectra (in daytime today).
PRM angular motion is ~ 10 urad in RMS when undamped and ~1 urad in RMS when damped.
If PR2/PR3 angular motions are something like this, and their motion are not enhanced when PRC is locked, measured g-factor of PRC looks OK. But |
Thu Mar 7 01:43:35 2013, yuta, Update, LSC, calibrated MI differential length spectra 
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Free swing MI differential length is 86 nm RMS and residual length when locked is 0.045 nm RMS(in-loop).
Looks very quiet. Comparison with PRMI is the next step.
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Thu Mar 7 18:12:03 2013, yuta, Update, Alignment, Input beam drift ~ 0.1 mrad/h in pitch
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[Jenne, Manasa, Yuta]
We temporarily centered the beam on IPANG to see input pointing drift. From eyeball, drift was ~ 0.1 mrad/h |
Thu Mar 7 18:48:43 2013, yuta, Update, Computer Scripts / Programs, releasing my secret scripts
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I released/updated my secret scripts to real scripts directory.
I checked they run correctly (but maybe not working correctly).
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Fri Mar 8 02:17:04 2013, yuta, Update, LSC, calibration of PRM actuator  
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[Manasa, Yuta]
We measured AC response of PRM actuator using PRM-ITMY cavity. |
Fri Mar 8 03:07:19 2013, yuta, Update, LSC, calibrated PRM-ITMY length spectra 
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Measured free swing PRM-ITMY length was 230 nm RMS.
MI differential length was 85 nm RMS(elog #8248). This tells you that PR2, PR3 are not so noisy compared with usual suspensions. |
Fri Mar 8 15:27:42 2013, yuta, Update, Green Locking, PSL green shutter installed
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[Manasa, Yuta]
Mechanical shutter for PSL green is installed right in front of PSL doubling crystal. |
Fri Mar 8 16:05:56 2013, yuta, Bureaucracy, General, action items for PRMI / ALS-FPMI
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We should focus our work both on PRMI and ALS-FPMI (elog #8250).
CDS: |
Wed Mar 13 08:34:33 2013, yuta, Update, Locking, TWO arms TWO colors
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- I took the shutter from AS table to use it for the PSL green. It was sitting near MC REFL path unused (elog
#8259).
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Tue May 3 21:05:23 2022, yuta, Update, BHD, AS path alignment, removing a lot of green stuff 7x
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[Tega, Yehonathan, Koji, Yuta]
We tried to align AS path this afternoon. |
Thu May 12 20:24:29 2022, yuta, Update, BHD, POX and POY investigation
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[Anchal, Yuta]
We checked POX and POY RF signal chains for sanity check since Xarm cannot be locked in IR stably as opposed to Yarm. |
Mon May 16 13:22:59 2022, yuta, Update, BHD, REFL and AS paths aligned at AP table 
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After Xarm and Yarm were aligned by Anchal et al, I aligned AS and REFL path in the AP table.
REFL path was alreasy almost perfectly aligned.
REFL path |
Thu May 19 18:56:08 2022, yuta, Update, BHD, Current OSEM sensor values with all the suspensions aligned
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Current OSEM sensor values with all the suspensions aligned are attached.
For 'BS','ITMX','ETMX','ITMY','ETMY','PRM','SRM','LO1','LO2', the ones out
of the range [200,800] are marked, and for 'PR2','PR3','SR2','AS1','AS4', the ones out of the range [6000,24000] |
Wed May 25 16:38:27 2022, yuta, Update, SUS, Suspensions quick health check 
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[JC, Yuta]
We did a quick health check of suspesions after the pump down.
Summary: |
Wed May 25 17:34:47 2022, yuta, Configuration, BHD, IFO recovery - IFO alignment
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IFO aligned to maximize flashings, except for GRY and LO-AS.
What we did: |
Thu May 26 19:55:43 2022, yuta, Configuration, BHD, Oplevs centered, BHD DCPDs are now online    
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[Paco, Yuta]
We have aligned the IFO (except for LO-AS and GRY), and centered all the oplevs.
We have also restored Gautam's in-air BHD DCPD setup and placed it to ITMY table. |
Fri May 27 17:45:53 2022, yuta, Configuration, BHD, BHD camera installed, GRY aligned
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[JC, Paco, Yuta]
After the IFO recovery (elog 40m/16881), we installed an analog camera for BHD fringe |
Wed Jun 1 11:56:28 2022, yuta, Update, ALS, Shutter driver for GRY replaced
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[JC, Yuta]
We replaced a shutter driver for GRY since it stopped working this morning. |
Thu Jun 2 20:05:37 2022, yuta, Configuration, PSL, IMC input power recovered to 1W, some alignment works 
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[Paco, Yuta]
We have increased the output power from the PSL table to 951 mW (it was 96.7 mW). |
Fri Jun 3 15:22:51 2022, yuta, Update, LSC, Both arms locked with POY/POX, IR beam centered on TMs with ASS 
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[JC, Paco, Yuta]
We locked both Y and X arms with POY11 and POX11. |
Fri Jun 3 17:42:50 2022, yuta, Update, LSC, MICH locks with AS55_Q
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AS path at AP table as re-aligned and confirmed that MICH can be locked with AS55 Q.
What we did: |
Mon Jun 6 21:01:22 2022, yuta, Update, IMC, MC1 OSEM sensor sign flipped, MC1/2/3 free swinging overnight for inmat diagonalization
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[Tomislav Andric, Rana, Yuta]
We put -1 to MC1 OSEM sensor gains and re-tuned MC1 damping.
We also kicked MC1, MC2, MC3 tonight for input matrix diagonalization. |
Tue Jun 7 17:26:21 2022, yuta, Update, SUS, ITMY ULCOIL mystery not solved  
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[Paco, Yuta]
We investigated the ITMY ULCOIL issue (40m/16873).
ULSEN is sensing the optic motion but ULCOIL cannot move the optic. |
Tue Jun 7 19:13:12 2022, yuta, Update, SUS, Agreement on suspension damping loop polarity conventions
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Anchal, Paco and I agreed to follow the polarity conventions below for suspension damping loops.
Some of the polarity/gains were changed to homogenize all the suspensions to the convention.
All the suspensions are homogenized except for MC1 (which have all - in sensor |
Wed Jun 8 18:16:20 2022, yuta, Update, SUS, ITMY ULCOIL mystery: Coil driver swap test 
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To see if the ULCOIL channel of the ITMY coil driver is working or not, I swapped ITMY coil
driver and ITMX coil driver by swapping DB15 cable (see Attachment #2).
With this swap, I confirmed that ITMX can be kicked with C1:SUS-ITMY_ULCOIL_OFFSET, |
Fri Jun 10 13:02:14 2022, yuta, Update, SUS, ITMY ULCOIL mystery: Coil driver swap test
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ITMY ULCOIL was measured to have ~3.3 mH as measured from the flange. RTFE 40m/16896 .
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Fri Jun 10 15:02:04 2022, yuta, Update, SUS, Servo gain sign flipped for MC1 WFS relief
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The servo gain for MC1 in /opt/rtcds/caltech/c1/Git/40m/scripts/MC/WFS/reliefWFS was flipped to account for COIL_GAIN flip done in 40m/16898.
The reliefWFS script now works fine.
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Fri Jun 10 20:11:46 2022, yuta, Update, ASC, Yarm ASS re-tuning in progress
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[Anchal, Yuta]
We tried to re-tune Yarm ASS today. It cannot be fully closed as of now. I think we need to play with signs. |
Fri Jun 10 21:10:01 2022, yuta, Update, SUS, ITMY ULCOIL mystery: Coil driver swap test
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We checked the photos we have, but we didn't have the photos which show ULCOIL situation clearly.
Free swing of ITMY (and others) will be done this weekend to see the OSEM spectra and resonant frequencies. |
Mon Jun 13 20:26:09 2022, yuta, Update, ASC, Yarm ASS re-tuning in progress -part 2- 
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[Anchal, Yuta]
We are still in the progress of re-commissioning Yarm ASS. |
Tue Jun 14 19:34:06 2022, yuta, Update, SUS, Resonant frequency identification from the free swing test 7x
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[JC, Anchal, Yuta]
We are working on resonant frequency idendification from the free swing test done last weekend.
Table below is the resonant frequencies identified, and attached are the plots of peak identification for some of our new suspensions. |
Wed Jun 15 15:45:37 2022, yuta, Update, SUS, LO1 LLCOIL now working, it was loose connection  
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We tracked the issue of LO1 LLCOIL not actuating LO1, and found that the DB9 cable from the coil driver to the sat amp was loose.
I tightened the screws and now it is working.
Never ever connect cables without screwing the connectors tightly! |
Wed Jun 15 17:03:17 2022, yuta, Update, SUS, ITMY ULCOIL issue solved, loose connection in sat amp box   
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[Anchal, Yuta]
We fixed the issue of ITMY ULCOIL not driving ITMY by replacing one of the 64pin ribbon cable in the satellite amplifier box. |