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ID Date Author Type Category Subjectup Text Attachments
  11484   Thu Aug 6 11:45:01 2015 JessicaUpdateGeneralALS Delay Line front panel testingKoji had suggested that I sync up the two
function generators to ensure that they have
the same base frequency and so that crosstalk
 conductive_X.pngconductive_Y.pngisolated_X.pngisolated_Y.png 
  11041   Tue Feb 17 00:24:47 2015 rana, jenneUpdateLSCALS Fool filter updated for more cancellationToday
we measured the TFs again and then updated
the filter in the POY -> ALS FF path so
 ALSfoo_150216.png15.png 
  11047   Wed Feb 18 17:51:40 2015 ericqUpdateLSCALS Fool impulse responseKoji raised a good question about the step
response I wrote about. Namely, if the UGF
of the ALS servo is around 100Hz, we would
 ALSfool_fasterKick.png 
  11048   Wed Feb 18 19:06:40 2015 KojiUpdateLSCALS Fool impulse response   latex-image-1.png 
  11046   Wed Feb 18 01:58:51 2015 ericqUpdateLSCALS Fool single arm performance I'm playing around with the lastest
ALS fool feedforward on the Yarm, and I like
what I'm seeing. 
 ALSfool_spectra.pngALSfool_kick.pngALSfool_LoopShapes.pngALSfool_Feb182015.zip 
  9283   Thu Oct 24 19:12:45 2013 MasayukiUpdateGreen LockingALS OFFSETTER calibrationI calibrated the ALS-OFFSETTER output.

I measured the FSR of cavity in unit
  
  9284   Thu Oct 24 21:46:18 2013 KojiUpdateGreen LockingALS OFFSETTER calibration

    

       
            
  
  13238   Tue Aug 22 02:19:11 2017 gautamUpdateALSALS OLTFsAttachment #1 shows the
results of my measurements tonight (SR785
data in Attachment #2).
 ALS_OLTFs.pdfALS_OLTF_Aug2017.zip 
  13244   Tue Aug 22 23:27:14 2017 ranaUpdateALSALS OLTFsDidn't someone look at what the OLG
req. should be for these servos at some point?
I wonder if we can make a parallel digital
  
  15157   Sun Jan 26 14:40:55 2020 gautamUpdateALSALS OOL noiseIn preparation for resuming IFO locking
activities, I measured the ALS noise with
the arm lengths locked to IR, AUX laser frequencies
 ALSnoise_20200126.pdf 
  14918   Mon Sep 30 18:20:26 2019 gautamUpdateALSALS OOL noise - a first lookAttachment #1 shows a
first look at the IR ALS noise after my re-coupling
 ALS_OOL_20190930.pdf 
  15220   Fri Feb 21 20:44:18 2020 shrutiUpdateALSALS OOL noise and PDH[Meenakshi, Shruti]

In order to adjust the relative
phase for PDH locking, we used the Siglent
 ALSNoise.pdfIMG_0086.jpg 
  15221   Sun Feb 23 18:15:22 2020 ranaUpdateALSALS OOL noise and PDHto
make the comparisons meaningfully
  
  15211   Thu Feb 13 21:30:55 2020 shrutiUpdateALSALS OOL noise with arms locked[Meenakshi, Gautam, Shruti]

Summary:

- We initially aligned the arm
 20200213_ALS.pdf 
  15213   Fri Feb 14 14:02:13 2020 shrutiUpdateALSALS OOL noise with arms locked[Meenakshi, Shruti]

Even though we were not able to
lock the the IR beat (by enabling LSC) during
 819472_10.pdf225642_10.pdf693500_10.pdf 
  15214   Fri Feb 14 14:52:41 2020 gautamUpdateALSALS OOL noise with arms lockedUnlikely, the alignment was probably just
not good. I restored the alignment and now
the arms can be locked to IR frequency.
  
  15216   Tue Feb 18 18:14:59 2020 shrutiUpdateALSALS OOL noise with arms lockedWe proceeded with the trying to measure
the ALS out-of-loop noise of the X arm when
the X arm cavity is green-locked using different
 ALSNoise.pdf 
  15217   Wed Feb 19 22:20:22 2020 ranaUpdateALSALS OOL noise with arms lockedCould you please put physical units on
the Y-axis and also put labels in the legend
which give a physical description of what
  
  16161   Tue May 25 17:42:11 2021 Anchal, PacoSummaryALSALS Single Arm Noise BudgetHere is our first attempt at a single-arm
noise budget for ALS.

Attachment 1 shows
 ALS_IR_b.svgALS_Single_Arm_IR.pdf 
  16164   Thu May 27 11:03:15 2021 Anchal, PacoSummaryALSALS Single Arm Noise BudgetHere's an updated X ARM ALS noise budget.

Things to remember:


Major
mistake we were making earlier was that we
 ALS_Single_X_Arm_IR.pdfALS_OOL_with_Ref.pdf 
  11891   Thu Dec 17 16:44:03 2015 gautamUpdateCDSALS Slow control MEDM screen updated


 ALS_SLOW_17DEC2015.png 
  9721   Tue Mar 11 19:38:26 2014 manasaUpdateGreen LockingALS Slow servo settings

    

       
            
  
  9727   Fri Mar 14 10:31:10 2014 jamieUpdateGreen LockingALS Slow servo settings

    

       
            
  
  9624   Tue Feb 11 21:22:02 2014 manasaUpdateGreen LockingALS X and Y arm restoredThe X and
Y arms were locked successfully using ALS
  
  9625   Tue Feb 11 22:17:06 2014 KojiUpdateGreen LockingALS X and Y arm restoredNice restoration. We eventually want to
make transition of the servo part from ALS
to LSC model for the further handing off
  
  9887   Thu May 1 00:13:21 2014 KojiUpdateLSCALS X beat setup alignedI saw big misalignment on the GTRX camera,
I went to the PSL table and aligned the beat
beams.
  
  9983   Wed May 21 13:20:34 2014 manasaUpdateLSCALS X noise from angular motion of mirrors

    

       
            
 ALSX_OLYerrITM.png 
  9988   Thu May 22 00:30:40 2014 manasaUpdateLSCALS X noise from angular motion of mirrorsBelow are the transfer functions measured
between the angular (pit, yaw) motion of
X arm mirrors and the ALSX error signal.
 ALSX_OLPerrITM2.pngALSX_OLYerrITM.pngALSX_OLPerrETM.pngALSX_OLYerrETM2.png 
  9972   Tue May 20 02:12:35 2014 JenneUpdateLSCALS X noise investigation[Rana, Jenne]
We
have looked at a few things that do and don't
 ALS_outofloop_19May2013.pdfXbeatSaturate.png 
  9880   Wed Apr 30 16:07:59 2014 manasaUpdateLSCALS X noise post servo modificationI. The Y arm stayed stable through last
night and I have saved the arm lock settings
to IFOconfigure.
 ALSX_PToltf.jpgALSX_FreeInloop.jpgALSX_ool.jpgALSX_OLTF.jpg 
  6318   Fri Feb 24 19:25:43 2012 jamieUpdateLSCALS X-arm beatbox added, DAQ channels wiring normalizedI have hooked the ALS beatbox into the
c1ioo DAQ.  In the process, I did some
rewiring so that the channel mapping corresponds
  
  9904   Fri May 2 13:03:30 2014 JenneUpdateLSCALS Y beat setup alignedI touched up the alignment of the Ygreen
on the PSL table.
  
  9905   Fri May 2 14:31:26 2014 KojiUpdateLSCALS Y beat setup alignedPlease check the X&Y ALS out-of-loop
stability. Use fine resolution (BW0.01).
Calibrate the POX/POY in Hz.
  
  8865   Wed Jul 17 22:51:50 2013 KojiUpdateGreen LockingALS Y performance with the new whitening filter[Manasa Koji]
Summary: 
The new whitening filters improved
 ALS_Y_130717.pdfALS_Y2_StripTool.png 
  8866   Thu Jul 18 01:10:00 2013 kiwamuUpdateGreen LockingALS Y performance with the new whitening filter 
  
  8878   Fri Jul 19 12:00:12 2013 manasaUpdateGreen LockingALS Y performance with the new whitening filter

    

       
            
  
  8864   Wed Jul 17 22:49:37 2013 KojiUpdateGreen LockingALS Y whitening filter change[Koji Annalisa]
We did the same mod of the beatbox
for the Y arm too. See 
  
  10331   Mon Aug 4 22:52:03 2014 JenneUpdateLSCALS alignment tweak-upAfter aligning the arms to IR, I aligned
the Y green beam to the arm.  Also,
the X green beatnote was very small, so I
  
  9219   Tue Oct 8 00:21:01 2013 manasaHowToGreen LockingALS arm stabilizationStep by
step procedure for stabilizing arms using
ALS servo
  
  9178   Mon Sep 30 23:56:19 2013 manasaUpdateGreen LockingALS autolocker flowchart[Masayuki, Manasa] 
Flowchart for ALS autolocker. The
error signal thresholds will be decided by
 ALSautolocker.png 
  9179   Tue Oct 1 09:51:10 2013 ranaUpdateGreen LockingALS autolocker flowchart  I think we can use the IMC
autolocker to start with getting this started.
Once Jamie fixes the NDSSERVER environment
  
  6074   Tue Dec 6 00:26:00 2011 kiwamuUpdateLSCALS became robust : UGF = 100 HzEventually
the instability in the Y end PDH servo turned
out to be some kind of an alignment issue.
  
  14468   Wed Feb 20 23:55:51 2019 gautamUpdateALSALS delay line electronicsSummary:

Last year, I worked
on the ALS delay line electronics, thinking
 delayLineDemod.pdf.zip 
  14475   Thu Mar 7 01:06:38 2019 gautamUpdateALSALS delay line electronicsSummary:

The restoration of the delay-line
electronics is complete. The chassis has
  
  14477   Tue Mar 12 22:51:25 2019 gautamUpdateALSALS delay line electronicsThis
Hanford alog may be of relevance as we
are using the aLIGO AA chassis for the IR
  
  14478   Wed Mar 13 01:27:30 2019 gautamUpdateALSALS delay line electronicsThis test was done, and I determine the
frequency discriminant to be 
 DFDcal.pdfDFDnoise.pdf 
  14479   Thu Mar 14 23:26:47 2019 AnjaliUpdateALSALS delay line electronicsAttachment #1 shows the schematic of the
test setup. Signal generator (Marconi) was
used to supply the RF input. We observed
 test_setup_ALS_delay_line_electronics.pdf 
  9204   Fri Oct 4 20:25:12 2013 MasayukiUpdateGreen LockingALS down scriptI wrote the down script for ALS. This script
is 
(script)/ALS/ALSdown.py When
 Screenshot-Untitled_Window.png 
  9226   Wed Oct 9 18:45:17 2013 MasayukiUpdateGreen LockingALS down script modified

    

       
            
  
  13594   Wed Jan 31 16:33:53 2018 gautamUpdateALSALS electronics at LSC rack[steve,
gautam]

We installed some 
  
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