40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log, Page 8 of 346  Not logged in ELOG logo
ID Date Authordown Type Category Subject Text Attachments
  17413   Mon Jan 23 22:51:17 2023 yutaSummaryBHD60 Hz harmonics side lobe investigations[Paco, Yehonathan, Yuta]

Since we have installed BH44, we
are seeing side lobes of 60 Hz + harmonics
 Screenshot_2023-01-24_11-43-40_POXPOYDark.png 
  17417   Tue Jan 24 21:29:31 2023 yutaSummaryBHDElectronics diagram around BH44 and BH551) Turning the whitening filter before
the ADC on/off didn't changed the relative
height of 60 Hz peak compared with the
 BH44BH55Diagram.pdf 
  17419   Wed Jan 25 11:35:20 2023 yutaSummaryBHDREFL55 visually inspected, BH44 Kapton tapedFollowing was done to investigate 60 Hz
noise issue, but no significant change in
the FPMI noise observed.
 REFL55.JPGBH44Kapton.JPG20230125_FPMIBHDPDs_Spectra_FPMILockedBH55Locked.pdf20230125_FPMIBHDPDs_Spectra_FPMILockedBH55LockedNoWhitening.pdf20230125_FPMIBHDPDs_Spectra_FPMILockedBH55LockedResG60InCARM.pdf 
  17423   Wed Jan 25 18:01:21 2023 yutaSummaryBHDBH44 setup isolated, but 60 Hz noise stays the same[Paco, Anchal, Yuta]

Isolating
BH44 setup from the rest didn't help
 BH44BH55Diagram_Disconnected.pdf20230125_FPMIBHDPDs_Spectra_BothArmsLocked.pdf20230125_FPMIBHDPDs_Spectra_BothArmsLockedBH44Removed.pdf20230125_MCF.pdf 
  17426   Thu Jan 26 16:07:05 2023 yutaSummaryPSLPMC aligned, now PMC transmission is 0.7PMC aligned (Attachment #1).
Over the past month, PMC transmission
is actually slowly growing from 0.68 to 0.70
 Screenshot_2023-01-26_16-10-20.pngScreenshot_2023-01-26_16-10-35.png 
  17431   Fri Jan 27 19:35:31 2023 yutaSummaryBHD60 Hz noise investigations around IMCSo far different measurements are consistent
with the hypothesis that the 60 Hz noise
is from PSL frequency noise (40m/17423).
 6x 
  17432   Fri Jan 27 21:22:57 2023 yutaSummaryBHDV beam dump installed for BH44 RF PDOne of these V beam dumps was installed
for BH44 RF PD.
The rest is now stored in the box
 V.JPG 
  17446   Fri Feb 3 17:39:38 2023 yutaSummaryBHD60 Hz noise investigations around IMC, part 2[Paco, Yuta]

We estimated the frequency noise of
 Screenshot_2023-02-03_12-34-10_IMC60HzComb.pngXARM_calibrated_noise_20230203.pdfYARM_calibrated_noise_20230203.pdfMC_F_57Hzline.pdfFPMI_calibrated_noise_20230203.pdf 
  14205   Fri Sep 21 09:59:09 2018 yukiConfigurationASCY end table upgrade plan[Yuki, Gautam]

Attachments #1 is the current setup
of AUX Y Green locking and it has
 Pic_CurrentSetup_AUXYgreen.jpegModeMatchingSolution_Current.pdfModeMatchingSolution_Current_Magnified.pdfModeMatchingSolution_Optimized.pdfModeMatchingSolution_Optimized_Magnified.pdf 
  14211   Sun Sep 23 17:38:48 2018 yukiUpdateASCAlignment of AUX Y end green beam was recovered[ Yuki, Koji, Gautam ]

An alignment of AUX Y end green
beam was bad. With Koji and Gautam's
  
  14212   Sun Sep 23 19:32:23 2018 yukiConfigurationASCY end table upgrade plan[ Yuki, Gautam ]

The setup I designed before has
abrupt gouy phase shift between two steering
 Pic_NewSetup0923_AUXYgreen.jpegModeMatchingSolution_Result.pdfModeMatchingSolution_Magnified_0923.jpgpic0923_1.jpgpic0923_2.jpg 
  14214   Mon Sep 24 11:09:05 2018 yukiConfigurationASCY end table upgrade plan[ Yuki, Steve ]

With Steve's help, we checked
a new lens can be set soon after dichroic
 pic0924_1.jpg 
  14216   Tue Sep 25 18:08:50 2018 yukiConfigurationASCY end table upgrade plan[ Yuki, Gautam ]

We want to remotely control steeing
PZT mirrors so its driver is needed.
  
  14218   Thu Sep 27 14:02:55 2018 yukiConfigurationASCPZT driver board verification[ Yuki, Gautam ]

I fixed the input terminal that
had been off, and made sure PZT driver
 PZTdriverSimulationDiagram.pdfPZTdriverSimulationResult.pdfPZTdriverPerformanceCheck_ResultOUT.pdfPZTdriverPerformanceCheck_ResultMON.pdfPZTdriver.asc 
  14219   Sun Sep 30 20:14:51 2018 yukiConfigurationASCQPD calibration[ Yuki, Gautam, Steve ]

Results:
I calibrated a QPD (D1600079, V1009)
 QPDcalibrationXaxis.pdfQPDcalibrationYaxis.pdf 
  14221   Mon Oct 1 13:33:55 2018 yukiConfigurationASCQPD calibration


Quote:


 Pic_QPDcalibration.jpg 
  14224   Tue Oct 2 18:50:53 2018 yukiConfigurationASCPZT mirror calibration[ Yuki, Gautam ]

I calibrated PZT mirrors. The ROUGH
result was attached. (Note that some errors and
 PZTM1calibrationCH2.pdfPZTM1calibrationCH1.pdfPZTM2calibrationCH2.pdfPZTM2calibrationCH1.pdf 
  14226   Wed Oct 3 14:24:40 2018 yukiConfigurationASCY end table upgrade planInterim Procedure Report:

Purpose

The current setup of AUX Y-arm
  
  14227   Wed Oct 3 18:15:34 2018 yukiConfigurationASCAI board improvement[ Yuki, Gautam ]

I improved Anti-Imaging board (D000186-Rev.D),
which will be put between DAC port and
 TF_AIboard.pdf 
  14228   Thu Oct 4 00:44:50 2018 yukiConfigurationASCAI board improvement[ Yuki, Gautam ]

I made a cable which connects DAC
port (40 pins) and AI board (25 pins). I
  
  14230   Thu Oct 4 22:15:30 2018 yukiConfigurationASCY-end table upgradeBefore changing setup at Y-end table, I
measured the status value of the former setup
as follows. These values will be compared
 AUXYGreenLock20180921.jpgPic_FormerSetup.jpegPic_CurrentSetup1004.jpg 
  14232   Fri Oct 5 17:32:38 2018 yukiConfigurationASCY-end table upgradeI measured it with the wrong setting of
a powermeter. The correct ones are here:


beam power going into doubling
  
  14234   Fri Oct 5 22:49:22 2018 yukiConfigurationASCY-end table upgradeI designed a new layout. It has good mode-matching
efficiency, reasonable sensitivity to component
positions, good Gouy phase separation. I'm
  
  14236   Sun Oct 7 22:30:42 2018 yukiConfigurationLSCYarm Green locking was recoveredI finished installation of optics in the
Y-end and recovered green locking. Current
ALS-TRY_OUTPUT is about 0.25, which is lower
 Pic_NewLayout1007.jpgYendGreenModeMatching.zip 
  14237   Mon Oct 8 00:46:35 2018 yukiConfigurationASCY-end table upgrade


Quote:


  
  14240   Tue Oct 9 23:03:43 2018 yukiConfigurationLSCYarm Green locking was recovered[ Yuki, Gautam, Steve ]

To align the green beam in Y-end
these hardware were installed:
 Pic_1Y4.jpgPic_PZTcable.jpg 
  14241   Wed Oct 10 12:38:27 2018 yukiConfigurationLSCAll hardware was installedI connected DAC - AIboard - PZTdriver -
PZT mirrors and made sure the PZT mirrors
were moving when changing the signal
  
  14243   Thu Oct 11 13:40:51 2018 yukiUpdateComputer Scripts / Programsloss measurements


Quote:


  
  14245   Fri Oct 12 12:29:34 2018 yukiUpdateComputer Scripts / Programsloss measurementsWith Gautam's help, Y-arm was locked.
Then I ran the script "armloss_dcrefl_asdcpd_scope.py"
which gets the signals from oscilloscope.
  
  14248   Fri Oct 12 20:20:29 2018 yukiUpdateComputer Scripts / Programsloss measurementsI ran the script for measuring arm-loss
and calculated rough Y-arm round trip loss
temporally. The result was 89.6ppm. (The
  
  14251   Sat Oct 13 20:11:10 2018 yukiUpdateComputer Scripts / Programsloss measurements


Quote:


  
  14254   Mon Oct 15 10:32:13 2018 yukiUpdateComputer Scripts / Programsloss measurementsI used these values for measuring armloss:


Transmissivitity of ITM
= 1.384e-2 * (1 +/- 1e-2) 
Transmissivitity
 XARM_20181015_1500.pdfYARM_20181015_1500.pdf 
  14255   Mon Oct 15 12:52:54 2018 yukiUpdateComputer Scripts / Programsadditional comments


Quote:


  
  14257   Mon Oct 15 20:11:56 2018 yukiConfigurationASCY end table upgrade planFinal Procedure Report for Green Locking
in YARM:

Purpose
  
  14258   Tue Oct 16 00:44:29 2018 yukiUpdateComputer Scripts / Programsloss measurementsThe scripts for measuring armloss are in
the directory "/opt/rtcds/caltech/c1/scripts/lossmap_scripts/armloss_scope".


armloss_derefl_asdcpd_scope.py:
  
  14260   Wed Oct 17 20:46:24 2018 yukiConfigurationASCY end table upgrade planTo do for Green Locking in YARM:

The auto-alignment servo should
be completed. This servo requires many parameters
  
  14280   Wed Nov 7 05:16:16 2018 yukiUpdateComputer Scripts / Programsarm loss measuremenentsPlease check your data file and compare
with those Johannes made last year.
I think the power in your data file may have
  
  12825   Mon Feb 13 17:19:41 2017 yinziConfiguration configuring ethernet for raspberry piGautam and I were able to get the Raspberry
Pi up and running today, including being
able to ssh into it from the control room.
 Screen_Shot_2017-02-13_at_5.11.52_PM.png 
  14825   Fri Aug 2 17:07:33 2019 yehonathan, gautamUpdateLoss Measurement We run a loss measurement on the Y arm
with 50 repetitions.
  
  14816   Mon Jul 29 19:08:55 2019 yehonathanUpdateLoss MeasurementReviving loss measurement by reflection1. X arm is totally misaligned in order
to measure the Y arm loss using the reflection
method. Each measurement round consists of
  
  14827   Mon Aug 5 14:47:36 2019 yehonathanUpdateLoss Measurement Summary:

I analyze the 100 reps loss measurement
of the Y arm using the AnalyzeLossData.ipynb
  
  Draft   Mon Aug 5 16:28:41 2019 yehonathanUpdateLoss Measurementwhat is going on with the loss measurements ?We hypothesize that the systematic error
in the loss measurement can come from the
fact that the requirement on the alignment
  
  14830   Mon Aug 5 17:36:04 2019 yehonathanUpdateLoss Measurement We check for unexpected drifts in the PD
reading (clipping and such). We put a pickoff
mirror where the PD used to be and place
 20190805_171511.jpg 
  14831   Tue Aug 6 14:12:02 2019 yehonathanUpdateComputersmaking rossa great againcdsutils is not working on rossa.

Import cdsutils produces this error:

In [2]: import cdsutils
  
  14834   Tue Aug 6 16:44:50 2019 yehonathanUpdateLoss Measurement I grab 2 hours of the PD measurements using
dlData_simple.ipynb in the misaligned state.

I get pretty much a normally distributed
 figure_1.pngfigure_1-1.png 
  15116   Fri Jan 10 19:48:46 2020 yehonathanUpdatePSLAssembly underway for c1psl upgrade{Yehonathan, Jon}

I finished pre-wiring the PSL chassis.
I mounted the Acromags on the DIN rails and
 20200110_194429.jpg20200110_194516_HDR.jpg 
  15118   Mon Jan 13 16:05:18 2020 yehonathanUpdatePSLAssembly underway for c1psl upgrade{Yehonathan, Jon}

I configured the Acromag channels
according to the Slow
  
  15120   Tue Jan 14 17:16:43 2020 yehonathanUpdatePSLAssembly underway for c1psl upgrade{Yehonathan, Jon}

I isolated a BIO Acromag completely
from the chassis and powered it up. The inverted
  
  15262   Tue Mar 10 14:30:16 2020 yehonathanUpdateSUS ETMX was grossly misaligned.

I re-aligned it and the X arm now
locks.
 Screenshot_from_2020-03-10_19-02-31.png 
  15263   Tue Mar 10 19:58:16 2020 yehonathanUpdateSUS I returned the triggering threshold to
normal values (5/3).

  
ELOG V3.1.3-