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ID Date Author Type Category Subjectup Text Attachments
  10396   Thu Aug 14 22:58:59 2014 rana, jenneSummaryGreen LockingALS DIFF tuning We've been having trouble tuning
the ALS DIFF matrix. Trying to see if the
MC2 EXC can be cancelled in ALS DARM by adjusting
 sweep.pdf 
  11440   Thu Jul 23 20:54:42 2015 JessicaUpdateGeneralALS Delay Line BoxThe front panels for the ALS delay   
  11471   Thu Jul 30 18:58:36 2015 JessicaUpdateGeneralALS Delay Line Box Front Panel TestingI tested both of the front panels (conductive
and isolated SMAs) with the ALS Delay Line
Box by driving extremely close frequencies
 Xarm_diff.pngYarm_diff.pngXarm_isolated.pngYarm_isolated.png 
  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
  
  16956   Tue Jun 28 16:59:35 2022 PacoSummaryALSALS beat allan deviation (XARM)[Paco]

I took ~ 7 minutes of XALS beatnote
data with the XAUX laser locked to the XARM
 xbeat_1340469968.pdffrac_avar_xbeat.pdf 
  16959   Tue Jun 28 18:53:16 2022 ranaSummaryALSALS beat allan deviation (XARM)what's the reasoning behind using df/f_beat
instead of df/f_laser ?

  
  16962   Wed Jun 29 14:28:06 2022 PacoSummaryALSALS beat allan deviation (XARM)I guess it didn't make sense since
f_beat can be arbitrarily moved, but the
beat is taken around the PSL freq ~ 281.73
 frac_adev_xbeat.pdf 
  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
  
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