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ID Date Author Type Categoryup Subject Text Attachments
  15942   Thu Mar 18 21:37:59 2021 ranaUpdateLSCPRMI investigations: what IS the matrix??
Locked PRMI several tmes after
Gautam setup. Easy w IFO CONFIG screen
 PXL_20210319_045925024.jpg 
  15944   Fri Mar 19 11:18:25 2021 gautamUpdateLSCPRMI investigations: what IS the matrix??From Finesse simulation (and also analytic
calcs), the expected PRCL optical gain
is ~1 MW/m (there is a large uncertainty,
  
  15949   Fri Mar 19 22:24:54 2021 gautamUpdateLSCPRMI investigations: what IS the matrix??I did all these checks today. 




 IMG_9140.jpgIMG_9141.jpgREFL55.png 
  15956   Wed Mar 24 00:51:19 2021 gautamUpdateLSCSchnupp asymmetryI used the Valera technique to measure
the Schnupp asymmetry to be 
 Lsch.pdf 
  15958   Wed Mar 24 15:24:13 2021 gautamUpdateLSCNotes on testsFor my note-taking:


Lock PRMI with ITMs as
the MICH actuator. Confirm that the MICH-->PRCL
  
  15960   Wed Mar 24 22:54:49 2021 gautamUpdateLSCNew day, new problemsI thought I'd get started on some of
the tests tonight. But I found that this
problem had resurfaced. I don't know
 PRMI3f_noArmssensMat.pdfREFL55_whtGainStepping.pngREFL55_whtGainStepping2.png 
  15977   Mon Mar 29 19:32:46 2021 gautamUpdateLSCREFL55 whitening checkoutI repeated the usual whitening board characterization
test of:


driving a signal (using
 REFL55wht.png 
  15994   Sat Apr 3 00:42:40 2021 gautamUpdateLSCPRFPMI locking with half input powerSummary:

I wanted to put my optomechanical
instability hypothesis to the test. So
 PRFPMIlock_1301464998_1301465238.pdfCARMplant.pdf 
  15996   Mon Apr 5 22:26:01 2021 gautamUpdateLSCPRMI 1f locking (no ETMs) recoveredSince it seems like the entire electronics
chain has no obvious failure, I decided to
compensate for the apparent increased optical
 PRMI_Apr5sensMat_consolidated.pdf 
  16095   Thu Apr 29 11:51:27 2021 AnchalSummaryLSCStart of measuring IMC WFS noise contribution in ar cavity length noiseTried locking the arms


Ran IFO > Configure
> ! (YARM) > Restore YARM. Nothing
  
  16101   Thu Apr 29 17:51:19 2021 AnchalSummaryLSCStart of measuring IMC WFS noise contribution in arm cavity length noiset Both arms were locked simply by using
IFO > Configure > ! (YARM) > Restore
YARM. I had to use ASS to improve the TRX/TRY
 WFS1_PIT_exc_80-100Hz_Arms_ASD.pdf 
  16104   Fri Apr 30 00:18:40 2021 gautamSummaryLSCStart of measuring IMC WFS noise contribution in arm cavity length noiseThis is the actuator calibration.
For the error point calibration, you have
to look at the filter in the calibration
  
  16108   Mon May 3 09:14:01 2021 Anchal, PacoUpdateLSCIMC WFS noise contribution in arm cavity length noiseLock
ARMs
 WFS1_PIT_Noise_Inj_Test_IMC_unlocked.pdfWFS1_PIT_Noise_Inj_Test_ARM_locked.pdf 
  16112   Mon May 3 17:28:58 2021 Anchal, Paco, RanaUpdateLSCIMC WFS noise contribution in arm cavity length noiseRana came and helped us figure us where
to inject the noise. Following are the characteristics
of the test we did:
 excitationoftheMCanglessothatwecanseesomethingdotpng.pngexcitationoftheMCanglessothatwecanseesomethingdotpngbutthistimeitsMC2.png 
  16117   Tue May 4 11:43:09 2021 Anchal, PacoUpdateLSCIMC WFS noise contribution in arm cavity length noiseWe redid the WFS noise injection test and
have compiled some results on noise contribution
in arm cavity noise and IMC frequency noise
 ArmCavNoiseContributions.pdfIOO-MC1_PIT_NoiseInjTest2.pdfIOO-MC1_PIT_NoiseInjTest_AWGGUI_Config.png 
  16127   Fri May 7 11:54:02 2021 Anchal, PacoUpdateLSCIMC WFS noise contribution in arm cavity length noiseWe today measured the calibration factors
for XARM_OUT and YARM_OUT in nm/cts and replotted
our results from 16117
 ITMX-XARM_TF.pdfITMY-YARM_TF.pdfArmCavNoiseContributions.pdf 
  16129   Mon May 10 18:19:12 2021 Anchal, PacoUpdateLSCIMC WFS noise contribution in arm cavity length noise, CorrectionsA few corrections to last analysis:


The first plot was not
IMC frequency noise but actually MC_F noise
 ArmCavNoiseContributions.pdf 
  16132   Wed May 12 10:53:20 2021 Anchal, PacoUpdateLSCPSL-IMC PDH Loop and XARM PDH Loop diagramAttached is the control loop diagram when
main laser is locked to IMC and a single
arm (XARM) is locked to the transmitted light
 IMC_SingleArm.pdf 
  16228   Tue Jun 29 17:42:06 2021 Anchal, Paco, GautamSummaryLSCMICH locking tutorial with GautamToday we went through LSC locking mechanics
with Gautam and as a "Hello World"
example, worked on locking michelson cavity.
  
  16232   Wed Jun 30 18:44:11 2021 AnchalSummaryLSCTried fixing ETMY QPDI worked in Yend station, trying to get
the ETMY QPD to work properly. When I started,
only one (quadrant #3) of the 4 quadrants
  
  16233   Thu Jul 1 10:34:51 2021 Paco, AnchalSummaryLSCETMY QPD fixedPaco worked on alignign the beam splitter
to get light on the ETMY QPD and was successful
in centering it without any other changes
  
  16237   Fri Jul 2 12:42:56 2021 Anchal, Paco, GautamSummaryLSCsnap file changed for MICHWe corrected the MICH locking snap file
C1configure_MI.req and saved an updated C1configure_MI.snap.
Now the 'Restore MICH' script in
  
  16241   Thu Jul 8 11:20:38 2021 Anchal, Paco, GautamSummaryLSCPRFPMI locking attemptsLast night Gautam walked us through the
algorithm used to lock PRFPMI. We tried it
several times with the PSL HEPA filter off
  
  16247   Wed Jul 14 20:42:04 2021 gautamUpdateLSCLocking[paco, gautam]

we decided to give the PRFPMI lock
a go early-ish. Summary of findings today
  
  16248   Thu Jul 15 14:25:48 2021 PacoUpdateLSCCM board[gautam, paco]

We tested the CM board by implementing
the high bandwidth IR lock (single arm).
 high_BW_TFs.pdf 
  16251   Mon Jul 19 22:16:08 2021 pacoUpdateLSCPRFPMI locking[gautam, paco]

Gautam managed to lock PRFPMI a
little before ~ 22:00 local time. The ALS
  
  16261   Tue Jul 27 23:04:37 2021 AnchalUpdateLSC40 meter party[ian, anchal, paco]

After our second attempt of locking
PRFPMI tonight, we tried to resotre XARM
 Screenshot_2021-07-27_22-19-58.png 
  16264   Wed Jul 28 17:10:24 2021 AnchalUpdateLSCSchnupp asymmetry[Anchal, Paco]

I redid the measurement of Schnupp
asymmetry today and found it to be 3.8 cm
 Lsch.pdf 
  16275   Wed Aug 11 11:35:36 2021 PacoUpdateLSCPRMI MICH orthogonality plan[yehonathan, paco]

Yesterday we discussed a bit about
working on the PRMI sensing matrix.
  
  16303   Mon Aug 30 17:49:43 2021 PacoSummaryLSCXARM POX OLTFUsed diaggui to get OLTF in preparation
for optimal system identification / calibration.
The excitation was injected at the control
 XARM_POX_OLTF.pdfXARM_POX_Coh.pdf 
  16304   Tue Aug 31 14:55:24 2021 ranaSummaryLSCXARM POX OLTFthis model doesn't seem to include
the analog AA, analog AI, digital AA, digital
AI, or data transfer delays in the system.
  
  16320   Mon Sep 13 09:15:15 2021 PacoUpdateLSCMC unlocked?Came in at ~ 9 PT this morning to find
the IFO "down". The IMC had lost
its lock ~ 6 hours before, so at about 03:00
 VAC_2021-09-13_09-32-45.png 
  16322   Mon Sep 13 15:14:36 2021 AnchalUpdateLSCXend Green laser injection mirrors M1 and M2 not responsiveI was showing some green laser locking
to Tega, I noticed that changing the PZT
sliders of M1/M2 angular position on Xend
  
  16368   Thu Sep 30 14:13:18 2021 AnchalUpdateLSCHV supply to Xend Green laser injection mirrors M1 and M2 PZT restoredLate elog, original date Sep 15th

We found that the power switch
of HV supply that powers the PZT drivers
  
  16888   Fri Jun 3 15:22:51 2022 yutaUpdateLSCBoth arms locked with POY/POX, IR beam centered on TMs with ASS[JC, Paco, Yuta]

We locked both Y and X arms with POY11
 IRBeamsOnTMs.JPGScreenshot_2022-06-03_15-03-51.png 
  16889   Fri Jun 3 17:42:50 2022 yutaUpdateLSCMICH locks with AS55_QAS path at AP table as re-aligned and confirmed
that MICH can be locked with AS55 Q.
 Screenshot_2022-06-03_17-41-55.png 
  16890   Sun Jun 5 19:46:40 2022 PacoUpdateLSCFixed IMC Trans sum issue[Paco]

Fixed the issue below:

  
  16892   Mon Jun 6 13:35:11 2022 PacoUpdateLSCFirst calibrated spectra of MICH at AS55 Q[Paco, Yuta]

On the topic of high AS55_Q RFPD
offset, it seems it stems from a small residual
 Screenshot_2022-06-06_17-30-16_MICHOLTF.pngCalibrated_MICH_ERR.pdf 
  16929   Fri Jun 17 16:22:21 2022 yutaUpdateLSCActuator calibration of BS. ITMX, ITMY, updated MICH displacement spectra from c1calFollowing what we have done in 2013 (40m/8242),
actuator calibration was done using MICH.
 6x 
  16940   Wed Jun 22 18:55:31 2022 yutaUpdateLSCDaily alignment work; POY trouble solved[Koji, Yuta]

I found that Yarm cannot be locked
 Screenshot_2022-06-22_17-17-42_XYaligned.pngScreenshot_2022-06-22_18-58-26_Transmission.png 
  16941   Wed Jun 22 19:41:13 2022 KojiUpdateLSCDaily alignment work; POY trouble solvedBefore the final measurement of the DC
values for the transmissions, I aligned the
PMC. This made the PMC trans increased from
  
  16952   Mon Jun 27 18:54:27 2022 yutaUpdateLSCModulation depths measurement using Yarm cavity scan[Yehonathan, Yuta]
EDITED
by YM on 22:11 June 27, 2022 to correct for
 YarmModIndex.png 
  16968   Fri Jul 1 08:50:48 2022 yutaSummaryLSCFPMI with REFL/AS55 trial[Anchal, Paco, Yuta]

We tried to lock FPMI with REFL55
and AS55 this week, but no success yet.
  
  16977   Thu Jul 7 18:18:19 2022 yutaUpdateLSCActuator calibration of ETMX and ETMX(This is a
complete restore of elog 40m/16970
from July 5, 2022 at 14:34)
 Screenshot_2022-07-05_14-52-01_OLTF.pngScreenshot_2022-07-05_14-54-03_TF.pngScreenshot_2022-07-05_14-56-41_Ratio.png 
  16978   Thu Jul 7 18:22:12 2022 yutaUpdateLSCActuator calibration of MC2 using Yarm(This is also
a restore of elog 40m/16971
from Jul 5, 2022 at 17:36)
 TF.pngMC2.png 
  16981   Fri Jul 8 16:18:35 2022 ranaUpdateLSCActuator calibration of MC2 using Yarmalthough I know that Yuta knows this, I
will just put this here to be clear: the
NNN/f^2 calibration is only accurate abouve
  
  17002   Thu Jul 14 00:10:08 2022 yutaSummaryLSCFPMI with REFL/AS55 trial continued[Paco, Koji, Yuta]

We managed to lock MICH using REFL55_Q
by setting the demodulation phases and offsets
 AS55_I.pngAS55_Q.pngREFL55_I.pngREFL55_Q.png 
  17007   Fri Jul 15 19:13:22 2022 PacoSummaryLSCFPMI with REFL/AS55 demod phase adjust[Yuta, Paco]


We first zero the offsets
in ASDC, AS55, REFL55, POX11, and POY11 when
  
  17008   Fri Jul 15 22:36:04 2022 ranaSummaryLSCFPMI with REFL/AS55 demod phase adjustVery nice!   
  17012   Mon Jul 18 16:39:07 2022 PacoSummaryLSCFPMI locking procedure using REFL55 and AS55[Yuta, Paco]

In summary, we locked FPMI using
REFL55_I, REFL55_Q, and AS55_Q. The key to
 DARM_07_18_2022_FMPI.pdfCARM_07_18_2022_FPMI.pdfMICH_07_18_2022_FPMI.pdffpmi_darm_nb_2022_07.pdf 
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