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ID Date Authorup Type Category Subject Text Attachments
  179   Fri Dec 7 11:33:24 2007 waldmanOmnistructureOMCPZT wiringThe 2 pin LEMO connector has got an unmarked
pin and a pin marked by a white half-circle.
The unmarked pin is connected to the side
  
  206   Thu Dec 20 19:05:34 2007 waldmanHowToOMCHOWTO build front endsFor instance,  to build the TPT front end
code.
  
  207   Thu Dec 20 19:10:03 2007 waldmanUpdateOMCStressful reattachment of heaterPhotos may follow eventually,  but for now
here's the rundown.  I scraped the heater
clean of the thermal epoxy using a clean
  
  14193   Wed Sep 5 10:59:23 2018 wgautamUpdateCDSCDS status updateRolf came by today morning. For now, we've
restarted the FE machine and the expansion
chassis (note that the correct order in which
  
  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).

  
  15614   Tue Oct 6 07:37:20 2020 yehonathanUpdateWikiNew TIS measurements of 40m OpticsLiYuan has kindly done some Total Integrating
Sphere (TIS) measurements on ITMU01 and ITMU02.
A summary of the measurement is attached.
 ITMU_sn01-02_tis_1.pdf 
  15788   Tue Feb 2 17:09:17 2021 yehonathanUpdateBHDSOS assemblyI set up a working area on the table next
to the south flow bench (see attachment).
I also brought in a rolling table for some
 20210202_165501.jpg20210202_162452.jpg 
  15816   Thu Feb 18 15:15:12 2021 yehonathanUpdateSUSOSEM testing for SOSsI am setting up a testing rig for the OSEMs
we recently obtained. I found the schematic
for the OSEM assembly from which the pin
 OSEM_Pin_Plate.png 
  15837   Wed Feb 24 10:09:16 2021 yehonathanUpdateSUSOSEM testing for SOSsYes, my phone camera mirrored the image.
Sorry for the confusion.

I see you already uploaded the
  
  16062   Wed Apr 21 11:09:57 2021 yehonathanUpdatePSLLaser amplifierI went to the TCS lab to take a look at
the chillers lying around. I spotted two
chillers:
 20210420_171606.jpg20210420_171621.jpg20210420_171611.jpg20210420_171629.jpg20210420_171702.jpg 
  16253   Wed Jul 21 18:08:35 2021 yehonathanUpdateLoss MeasurementLoss measurement{Gautam, Yehonathan, Anchal, Paco}

We prepared for the loss measurement
using DC reflection method. We did the following
  
  16371   Fri Oct 1 14:25:27 2021 yehonathanSummarySUSPRM and BS Angular Actuation transfer function magnitude measurements{Paco, Yehonathan, Hang}

We measured the sensing PRMI sensing
matrix. Attachment 1 shows the results, the
 MICH_PRM_-0.34.pngMICH_PRM_-0.1.png 
  16779   Thu Apr 14 11:52:57 2022 yehonathanSummaryBHDPart IIa of BHR upgrade - POY11 debugging{JC, Paco, Yehonathan, Ian}

POY lens was moved to infront of
the POY steering mirror to make the POU beam
 Screenshot_2022-04-14_15-53-39.pngPXL_20220414_220616875.jpg 
  16799   Thu Apr 21 18:18:42 2022 yehonathanUpdateBHDPOX Alignment{Yehonathan, Paco}

BS, ITMX and ETMX were aligned
to get flashing in the X arm.
 POX11_alignment.png 
  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
  
  14825   Fri Aug 2 17:07:33 2019 yehonathan, gautamUpdateLoss Measurement We run a loss measurement on the Y arm
with 50 repetitions.
  
  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 
  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:


  
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