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ID Date Author Type Categoryup Subject Text Attachments
  11562   Thu Sep 3 00:29:45 2015 ranaUpdateASCASS X not workingran the ON script several times and it
kept pulling it away from good alignment,
even when TRX was > 0.9.
  
  11721   Wed Oct 28 17:06:30 2015 ericqUpdateASCNew PRC Angular FF filters installedI've installed new filters for the
T240 -> PRM static online angular feedforward
that were trained after some of the recent
  
  11776   Tue Nov 17 20:40:08 2015 yutaroSummaryASCLoss maps of arm cavitiesIn preparation for the measurement of loss
maps of arm cavities, I measured the relationship
between:
  
  11779   Wed Nov 18 11:22:13 2015 yutaroUpdateASCLoss maps of arm cavitiesI got linear relation between these. The
results and method are below.

 ETM_PIT_up.pngETM_PIT_up.pngETM_YAW_up.png 
  12175   Tue Jun 14 11:29:25 2016 JohannesSummaryASCYArm OpLev CalibrationIn preparation for the armloss map I checked
the calibration of the Y-Arm ITM and ETM
OpLevs with the method originally described
 CavityCoupling.pdf 
  12591   Wed Nov 2 12:05:00 2016 ericqUpdateASCQuick WFS thoughtsI poked around a bit thinking about what
we need for a single AS WFS. 

New things that we would need:
  
  13985   Tue Jun 19 00:19:00 2018 gautamUpdateASCPOP status checkMotivation:


I want to use the QPD at
POP, calibrate it into physical units, and
  
  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 
  14220   Mon Oct 1 12:03:41 2018 not yukiConfigurationASCPZT driver board verificationI assume this QPD set is a D1600079/D1600273
combo.

How much was the SUM output during
  
  14221   Mon Oct 1 13:33:55 2018 yukiConfigurationASCQPD calibration


Quote:


 Pic_QPDcalibration.jpg 
  14222   Mon Oct 1 20:39:09 2018 gautamConfigurationASCc1asyWe need to set up a copy of the c1asx   
  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 
  14231   Fri Oct 5 00:46:17 2018 KojiConfigurationASCY-end table upgrade???

The SHG crystal has the conversion
efficiency of ~2%W (i.e. if you have 1W input
  
  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
  
  14233   Fri Oct 5 17:47:55 2018 gautamConfigurationASCY-end table upgradeWhat
about just copying the Xend
  
  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
  
  14237   Mon Oct 8 00:46:35 2018 yukiConfigurationASCY-end table upgrade


Quote:


  
  14238   Mon Oct 8 18:56:52 2018 gautamConfigurationASCc1asx filter coefficient file missingWhile pointing Yuki to the c1asx servo
system, I noticed that the filter
file for c1asx is missing in the usual chans
  
  14239   Tue Oct 9 16:05:29 2018 gautamConfigurationASCc1tst deleted, c1asy deployed.Setting up c1asy:


Backed up old c1tst.mdl
as c1tst_old_bak.mdl in /opt/rtcds/userapps/release/cds/c1/models
Copied
 CDSoverview_ASY.png 
  14257   Mon Oct 15 20:11:56 2018 yukiConfigurationASCY end table upgrade planFinal Procedure Report for Green Locking
in YARM:

Purpose
  
  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
  
  14716   Mon Jul 1 20:27:44 2019 gautamUpdateASCASX tuningSummary:

To practise the dither alignment
servo tuning, I decided to make the ASX system
 ASX_ditherlines.pdfASX.png 
  14976   Thu Oct 17 16:49:53 2019 gautamUpdateASCPRMI ASC - first passI tried implementing a basic PRMI ASC using
the POP QPD as a sensor. The POP22
buildup RMS is reduced by a factor of a few.
 PRMI_ASC.pdf 
  14985   Tue Oct 22 17:35:30 2019 gautamUpdateASCPRMI ASC - first passI made a change to the c1ass model to normalize
the PIT and YAW POP QPD outputs by the SUM
channel. A saturation block is used to prevent
 originalPOP_QPD.pngPOP_QPD_modified.png 
  14988   Wed Oct 23 11:14:21 2019 gautamUpdateASCPRMI ASC with QPD signals normalized.Attachment #1 - comparison
of the POP QPD PIT and YAW output signal
spectra with and without them being
 PRMI_ASC_normalization.pdfPRMI_ASC_Oct22.pdf 
  14991   Thu Oct 24 11:58:16 2019 gautamUpdateASCPRC angular feedforwardSummary:

I'd like to revive the PRC
angular feedforward system. However,
 ffPotential.pdf 
  15291   Thu Apr 2 15:53:01 2020 gautamUpdateASCPRMI 1f locked for collecting feedforward dataThis afternoon, I kept the PRM locked for
~1hour and then measured transfer functions
from the PRM angular actuators to the POP
  
  15296   Fri Apr 3 17:15:53 2020 gautamUpdateASCPOP angular FF filters trained and testedSummary:
Using the data I collected yesterday,
the POP angular FF filters have been trained.
 FIRvIIR.pdfPRM_act_calib.pdfIIR_fit_to_FIR_PIT.pdfIIR_fit_to_FIR_YAW.pdfPOP_DC_comparison.pdf 
  15297   Mon Apr 6 12:26:07 2020 ranaUpdateASCPOP angular FF filters trained and testedthat's pretty great performance. maybe
you can also upload some code so that we
can do it later too - or maybe in the 40m
  
  15298   Mon Apr 6 16:46:40 2020 gautamUpdateASCPOP angular FF filters trained and testedI don't have a recent measurement of
the optical gain of this config so I can't
undo the loop, but in-loop performance doesn't
 PRCL_comparison.pdf 
  15318   Tue May 5 23:44:14 2020 gautamUpdateASCIMC WFSSummary:

I've been thinking about the
IMC WFS. I want to repeat the sort of analysis
 WFSmatrixComparison.pdfWFSheadNoise.pdf 
  15320   Thu May 7 09:43:21 2020 ranaUpdateASCIMC WFSThis
is the doc from Keita Kawabe on why the
WFS heads should be rotated.
  
  15321   Thu May 7 10:58:06 2020 gautamUpdateASCIMC WFSOK so the QPD segments are in the "+"
orientation when the 40m IMC WFS heads are
mounted at 45 deg. I thought "+"
  
  15368   Wed Jun 3 02:14:32 2020 gautamUpdateASCPRC ASC improves arm transmission RINSummary:

I implemented an ASC servo for
the PRC, with the POP QPD as a sensor, and
 PRC_ASCsignals.pdfarmRIN_PRC_ASC.pdfPRFPMIcorner_ASC_PIT_1275190251_1275190551.pdfPRFPMIcorner_ASC_YAW_1275190251_1275190551.pdfPRFPMIcorner_ASC_coherence_1275190251_1275190551.pdf 
  15418   Fri Jun 19 16:30:09 2020 gautamUpdateASCSome thoughts about ASCSummary:

In ELOG
15368, I had claimed that the POP QPD
 sensingResponse.pdfsensingResponse_torque.pdf 
  15458   Tue Jul 7 14:06:10 2020 gautamUpdateASCSome more thoughts about ASCSummary:

I want to be able to run the dither
alignment servo with the PRFPMI locked -
 ITM_OL_DCcoupling.png 
  15682   Wed Nov 18 22:49:06 2020 gautamUpdateASCSome thoughts about AS WFS electronicsWhere do we
want to install the interface and readout
  
  15683   Sun Nov 22 21:09:37 2020 gautamUpdateASCPlanned mods for WFS headAttachment
#1 - Proposed mods
 aLIGO_wfs_v5_40m.pdfTFs.pdfnoise.pdf 
  15687   Mon Nov 23 23:27:43 2020 KojiSummaryASCQ3000 characterizationLast week and this week I've been working
on the characterization of the Q3000 QPDs.
The QPDs were named 81, 82, 83, and 94.
  
  15689   Wed Nov 25 18:18:41 2020 gautamUpdateASCPlanned mods for WFS headI am confused by the discussion during
the call today. I revisited Hartmut's
paper - the circuit in Fig 6 is essentially
 anodeVsOutput.pngsensitivity.png 
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