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  40m Log, Page 31 of 344  Not logged in ELOG logo
ID Date Author Type Categoryup Subject Text Attachments
  16861   Wed May 18 08:30:29 2022 PacoUpdateBHDSRM OpLev[Paco]

The SRM Oplev injection and detection
paths interfere heavily with the POY11. Due
  
  16862   Wed May 18 09:02:52 2022 AnchalUpdateBHDWFS1 PD centeredI centered WFS1 PD so that IMC WFS Servo
does not go out of range.

 
  
  16863   Wed May 18 17:23:15 2022 AnchalUpdateBHDPlaced PRM in BS Chamber[Anchal, Paco, Yuta, JC]

SRM Oplev setup


We
setup SRM oplev path for the aligned position
  
  16864   Thu May 19 08:51:40 2022 PacoUpdateBHDSRM OpLev[Paco, Ian]

After agreement from Yuta/Anchal,
I moved POYM1 yaw to clear the aforementioned
  
  16865   Thu May 19 18:56:08 2022 yutaUpdateBHDCurrent OSEM sensor values with all the suspensions alignedCurrent OSEM sensor values with all the
suspensions aligned are attached.
For 'BS','ITMX','ETMX','ITMY','ETMY','PRM','SRM','LO1','LO2',
 OSEMS.txt 
  16866   Thu May 19 19:05:59 2022 AnchalUpdateBHDBS Chamber all work finished, BHD path setup[Anchal, Paco, Yuta]

BS Oplev Path


The
changed position of PRM (40m/16863)
  
  16868   Fri May 20 20:03:48 2022 PacoUpdateBHDITMY chamber work finished - LO and AS overlapped[Paco, Anchal, Yuta]

Today, in short we:


Recovered alignment of
 Screenshot_2022-05-20_20-38-25.pngOSEMs.txt 
  16869   Mon May 23 13:16:59 2022 PacoUpdateBHDEnd of vent - checks[Paco, Yuta]

Prep for closing and pump down.


Aligned IFO to maximize
 OSEMs20220523.txtScreenshot_2022-05-23_13-24-06_IFOaligned_GTRY_still_clipping_but_less.pngPR3position.JPG 
  16872   Tue May 24 15:21:13 2022 AnchalUpdateBHDFreeswing tests of new SOS startedI modified the script freeSwing.py
to use damping loop output switches to free
the optic instead of watchdog or coil output
  
  16874   Wed May 25 16:56:44 2022 PacoConfigurationBHDIFO recovery - IMC alignment[Yuta, Paco]

We aligned IMC to recover the IFO
progressively. First step was to center the
  
  16875   Wed May 25 17:34:47 2022 yutaConfigurationBHDIFO recovery - IFO alignmentIFO aligned to maximize flashings, except
for GRY and LO-AS.
 Screenshot_2022-05-25_17-47-57.png 
  16877   Thu May 26 19:55:43 2022 yutaConfigurationBHDOplevs centered, BHD DCPDs are now online[Paco, Yuta]

We have aligned the IFO (except
for LO-AS and GRY), and centered
 elog_1Y2.JPGelog_BHD.JPGelog_box.JPGScreenshot_2022-05-26_17-37-27_IFOaligned_OplevCentered.pngScreenshot_2022-05-26_20-35-02.png 
  16880   Fri May 27 17:45:53 2022 yutaConfigurationBHDBHD camera installed, GRY aligned[JC, Paco, Yuta]

After the IFO recovery (elog 40m/16881),
  
  16883   Tue May 31 17:30:01 2022 YehonathanUpdateBHDGreen shutters fixed[Paco, Yehonathan]

We fixed the slow control over
the green beam shutters.
  
  16923   Thu Jun 16 17:40:15 2022 YehonathanUpdateBHDComparison of MICH OLTF model with measurementI made some progress in modeling MICH loop.

Putting all the LSC and SUS filters
together with the MICH Finesse model I constructed
 MICH_Model_Measurement_Comparison.pdf 
  16924   Thu Jun 16 18:23:15 2022 PacoConfigurationBHDRecovering LO beam in BHD DCPDs[Paco, Yuta]

We recovered the LO beam on the
BHD port. To do this, we first tried reverting
 Screenshot_2022-06-16_18-29-14_BHDLObeamISBACK.png 
  16927   Fri Jun 17 12:05:32 2022 YehonathanUpdateBHDComparison of MICH OLTF model with measurementI should write down what I didn't include
for completeness:

1. AA filters
  
  16928   Fri Jun 17 13:07:08 2022 KojiUpdateBHDComparison of MICH OLTF model with measurementI'm curious why the actual OLTF included
the 60Hz comb...? It is undesirable to have
such structure in the OLTF around the UGF
  
  16932   Tue Jun 21 14:17:50 2022 yutaConfigurationBHDBHD DCPDs re-routed to c1sus2After discussing with Anchal, we decided
to route BHD related PD signals directly
to ADC of c1sus2, which handles our new suspensions
 C1X07ADC1.JPGBHDDCPDs.JPG 
  16935   Tue Jun 21 21:17:16 2022 yutaUpdateBHDRTS models for BHD added but PCIE error remaining[Anchal, Yuta]

RTS
models for BHD homodyne phase control (c1hpc)
 Screenshot_2022-06-21_20-12-55_C1HPC.pngScreenshot_2022-06-21_20-14-56_C1SU2.pngScreenshot_2022-06-21_20-13-38_C1LSC.pngScreenshot_2022-06-21_20-34-44_RED.png 
  16938   Wed Jun 22 14:44:03 2022 AnchalUpdateBHDFixed DC error in c1su2, added new library model for suspensionsThe 0x2000 error in c1su2 happens whenever
we make it and install it as the default
data acquisition rates are too much in the
  
  16954   Tue Jun 28 14:24:23 2022 yutaUpdateBHDBHD DC PD signals now also sent to c1lsc to circumvent IPC error[JC, Yuta]

To circumvent IPC error sending
BHD DC PD signals from c1sus2 to c1lsc, DB9
 C1LSC.JPGC1SUS2.JPGScreenshot_2022-06-28_16-03-16_BHDDCPDcopied.png 
  16960   Tue Jun 28 22:27:11 2022 YehonathanUpdateBHDMeasurement of input and output electronics noise{Yuta, Yehonathan}

For MICH noise budgeting we measure
the input electronics noise which includes
 input_noise_spectrum.pdfoutput_noise_spectrum.pdf 
  16961   Tue Jun 28 23:10:34 2022 YehonathanUpdateBHDMeasurement of AS55 demod board conversion factor{Yuta, Yehonathan}

We measured the AS55 demod board
conversion from the amplitude of a 55MHz
  
  16984   Mon Jul 11 11:56:40 2022 he YehonathanUpdateBHDMICH AS55 noise budgetI calculated a noise budget for the MICH
using AS55 as a sensor. The calculation includes
closed-loop TF calculations.
 Control_Diagram.pdfMICH_AS55_Noise_Budget.pdf 
  16989   Tue Jul 12 09:14:50 2022 ranaUpdateBHDMICH AS55 noise budgetLooking good:


I think the notches you
see in he measured noise are a clue as to
  
  16996   Wed Jul 13 10:54:39 2022 YehonathanUpdateBHDMICH AS55 noise budgetI fixed some mistakes in the budget:

1. The BS pendulum resonance was
corrected from 0.8Hz to 1Hz
 BS_MICH_ACtuation_Calibration.pdfMICH_AS55_Model_Measurement_Comparison.pdfMICH_AS55_Noise_Budget.pdf 
  16999   Wed Jul 13 13:30:48 2022 YehonathanUpdateBHDadd Laser RIN to MICH budgetthe main laser noise coupling for a Michelson
is because of the RIN, not the frequency
noise. You can measure the RIN, in MC trans
  
  17013   Mon Jul 18 16:49:57 2022 YehonathanUpdateBHDadd Laser RIN to MICH budgetI measured the RIN by taking the spectrum
of C1:MC_TRANS_SUMFILT_OUT and
dividing it by the mean count on that channel
 Laser_RIN.pdfMICH_AS55_Noise_Budget.pdf 
  17015   Mon Jul 18 18:33:38 2022 KojiUpdateBHDadd Laser RIN to MICH budgetYou should measure the coupling
by noise injection. Noise budgeting does
not need any modeling:
  
  17018   Tue Jul 19 16:00:34 2022 yutaConfigurationBHDFast channels for BHD DCPDs now available in c1lsc but not in c1hpc[Paco, Anchal-remote-support, Yuta]

We added fast channels to BHD DC
PDs.
 Screenshot_2022-07-19_14-26-39_c1hpc.pngScreenshot_2022-07-19_14-24-49_c1lsc.pngScreenshot_2022-07-19_15-51-25_GreenGreen.png 
  17020   Tue Jul 19 18:41:42 2022 yutaUpdateBHDContrast measurements for Michelson and ITM-LO[Paco, Yuta]

We measured contrast of Michelson
 ContrastMeasurements.pdf 
  17024   Wed Jul 20 18:07:52 2022 PacoUpdateBHDBHD MICH test[Paco, Yuta, JC]

We did some easy tests on the BHD
readout in preparation for BHD MICH. With
 BHD_MICH_OSC.pdf 
  17025   Thu Jul 21 21:50:47 2022 TegaConfigurationBHDc1sus2 IPC updateIPC
issue still unresolved.

Updated shared memory tag so that
  
  17026   Fri Jul 22 15:05:26 2022 TegaConfigurationBHDc1sus2 shared memory and ADC fix[Tega, Yuta]

We were able to fix the shared
memory issue by updating the receiver model
 Screenshot_2022-07-22_15-04-33_DCPD.pngScreenshot_2022-07-22_15-12-19_models.pngScreenshot_2022-07-22_15-15-11_ERR.pngScreenshot_2022-07-22_15-32-19_GDS.png 
  17028   Fri Jul 22 17:46:10 2022 yutaConfigurationBHDc1sus2 watchdog update and DCPD ERR channels[Tega, Yuta]

We have added C1:HPC-DCPD_A_ERR and
 Screenshot_2022-07-22_17-48-25.png 
  17033   Mon Jul 25 17:58:10 2022 TegaConfigurationBHDc1sus2 IPC dolphin issue updateFrom the 40m
wiki, I was able to use the instructions
here
 Screen_Shot_2022-07-25_at_5.43.28_PM.pngScreen_Shot_2022-07-25_at_5.21.10_PM.pngScreen_Shot_2022-07-25_at_5.30.58_PM.pngScreen_Shot_2022-07-25_at_5.35.19_PM.png 
  17034   Mon Jul 25 18:09:41 2022 TegaConfigurationBHDBHD Homodyne Phase control MEDM screen[Paco, Tega, Yuta]

Today, we made a custom MEDM screen
for the BHD Homodyne Phase Control, which
 Screen_Shot_2022-07-25_at_6.12.08_PM.pngScreen_Shot_2022-07-25_at_6.18.09_PM.png 
  17037   Tue Jul 26 20:54:08 2022 PacoUpdateBHDBHD MICH test - LO phase control[Yuta, Paco]


TL;DR
Successfully
 20220726_BICHD.pdf 
  17040   Wed Jul 27 18:30:50 2022 yutaUpdateBHDLO beam power at BHD DCPDs is significantly lower than expected[Paco, Yehonathan, Yuta]

We measured power and counts at
BHD DCPDs with LO beam only and ITM single
 LOBeamAtBHD.JPGITMXSingleBounceAtBHD.jpg 
  17041   Thu Jul 28 13:09:28 2022 yehonathanUpdateBHDMode matching considerationsThe LO beam was found to have a power of
60uW, 10% of the power expected. We are pretty
sure about the expectation because the AS
  
  17042   Thu Jul 28 14:34:40 2022 YehonathanUpdateBHDLO beam power at BHD DCPDs is significantly lower than expected{Yuta, Yehonathan}

We went to the BS table to check
the POP beam power. We first notice that
  
  17044   Thu Jul 28 16:51:55 2022 TegaUpdateBHDShaking test for LO beam AS beam to BHD DCPDs[Yuta, Tega, Yehonathan]

To investigate the BHD power imbalance
and clipping issues, we did some shaking
 Screenshot_2022-07-28_16-58-34_LOandASShaking.pngScreenshot_2022-07-28_18-08-55_DCPDPOPSuspensionCoherence.png 
  17045   Thu Jul 28 20:16:26 2022 AnchalUpdateBHDShaking test for LO beam AS beam to BHD DCPDsSome insights from the inside vacuum situation:


The beam is an incident
near normal on PR2 close to the center of
  
  17046   Fri Jul 29 18:24:53 2022 TegaUpdateBHDLO beam power improved by factor of 6 after LO and AS beam alignment[Yuta, Tega]

From our previous work (elog 17044)
 LO_and_oldAS_settings.pngBHD_fringe_settings.pngScreenshot_2022-07-29_19-37-39.pngFromTheLeft-AS-POP-LO.JPG 
  17052   Mon Aug 1 18:42:39 2022 TegaConfigurationBHDc1sus2 IPC dolphin issue update[Yuta, Tega]

We decided to give the dolphin
debugging another go. Firstly, we noticed
 c1sus2_dolphin.pngfb1_dxamin_status.pngdolphin_num_mem_init2.png 
  17054   Tue Aug 2 17:25:18 2022 TegaConfigurationBHDc1sus2 dolphin IPC issue solved[Yuta, Tega, Chris]

We did
 c1lsc_IPC_status.pngFE_lsmod_dependencies_c1sus2_b4_after_iop_unpdate.png 
  17056   Wed Aug 3 16:00:51 2022 yutaUpdateBHDBHD fringe aligned with reduced LO and AS beam clippingLast week, we could find an alignment which
realizes LO beam and AS beam both unclipped,
but it was not consistent with an alignment
 Screenshot_2022-08-03_15-46-36_BHDfringeAlmostUnclipped.png 
  17067   Tue Aug 9 15:33:12 2022 yutaUpdateBHDBHD fringe contrast improved from 43% to 74%[Anchal, Yehonathan, Yuta]

We did the constrast measurement with
 HPC-DCPD_B_OUT_1344118517_ITMY-LO.pngHPC-DCPD_A_OUT_1344118517_ITMY-LO.pngHPC-DCPD_B_OUT_1344118318_ITMX-LO.pngHPC-DCPD_A_OUT_1344118318_ITMX-LO.png 
  17068   Tue Aug 9 15:50:22 2022 KojiUpdateBHDBHD fringe contrast improved from 43% to 74%For both 40m/17020
and 40m/17024,
what does the contrast mean if the numbers
  
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