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ID Date Author Type Category Subjectup Text Attachments
  11783   Wed Nov 18 17:32:36 2015 yutaroUpdateOptical LeversBeam centering for the oplev of ITMY[yutaro, Koji]

  
  11805   Tue Nov 24 11:18:47 2015 yutaroUpdateOptical LeversBeam centering for the oplev of ITMY I made the beam spot   
  8279   Tue Mar 12 14:02:22 2013 JenneUpdateAlignmentBeam drift - mystery partially solved?Steve just told those of us in the control
room that the custodian who goes into the
IFO room regularly steps on the blue support
  
  7837   Mon Dec 17 11:20:58 2012 JenneUpdateSUSBeam dumps on vertex oplevs removedI'm not sure when this was done, but there
were beam dumps in front of the lasers for
BS/PRM oplevs as well as ITMY/SRM oplevs. 
  
  12066   Thu Apr 7 12:51:24 2016 gautamUpdateendtable upgradeBeam height differencesSteve has finished installing the enclosure
on the new endtable. So Eric and I decided
to try and lock the X arm and measure the
  
  4222   Fri Jan 28 13:07:31 2011 JenneUpdateIOOBeam is back on the WFSThe MC WFS have had beam dumps in front
of them for the past ~2 weeks, until I could
find the appropriate optic to put in the
  
  10325   Fri Aug 1 22:56:27 2014 KojiUpdateGeneralBeam lost in the chamber???I was investigating several issues on the
IFO. As many of you noticed and not elogged,
ITMX had frequent kicking without its oplev
  
  11839   Wed Dec 2 17:14:33 2015 yutaroUpdateLSCBeam on POX11 is possibly not centered wellI checked how POXDC level changes when
the angle of ITMX is varied. ETMX was misaligned.

Then I found that in YAW direction
 47.png41.png 
  11847   Fri Dec 4 12:33:52 2015 yutaroUpdateLSCBeam on POX11 is possibly not centered wellTo focus POX beam on POX11 PD, I added
an iris and a lens before POX11 PD as you
can see in Attachment 1.
 image1-3.JPG07.png47.png 
  11850   Fri Dec 4 23:02:13 2015 yutaroUpdateLSCBeam on POX11 is possibly not centered well[yutaro, Koji]

Now, the beam on POX11 PD is well
centered and well focused.
 image1.JPG56.png04.png 
  8331   Fri Mar 22 01:28:56 2013 ManasaUpdateLasersBeam profile of NPRO from ATFThe NPRO from ATF has been installed on
the POY table.
I have been making measurements to
  
  12081   Mon Apr 18 00:29:00 2016 gautamUpdateGeneralBeam profiling + injection current scanSummary

I've finished up the remaining
characterization of the repaired 1W Innolight
 6x 
  511   Mon Jun 2 12:20:35 2008 josephbBureaucracyCamerasBeam scan has movedThe beamscan has been moved from the Rana
lab back over to the 40m, to be used to calibrate
the Prosilica cameras.
  
  7367   Sat Sep 8 00:04:53 2012 JenneUpdateGeneralBeam scan measurement plan - to do Monday morning.[MikeJ, Jenne]
We have a plan for how we're going
to measure the beam after PR3.  Mike
  
  7369   Mon Sep 10 08:50:35 2012 SteveUpdateGeneralBeam scan measurement plan - to do Monday morning. 
 I misaligned ITMX pitch on
Friday and brought out the beam at 44"
  
  14018   Tue Jun 26 10:50:14 2018 poojaUpdateCamerasBeam spot tracking using OpenCVAim: To track the motion of beam spot in
simulated video.

I simulated a video that moves
 cv2_track_fig.pdf 
  3864   Thu Nov 4 17:57:27 2010 steveUpdateGeneralBeamScanner is working againKoji, Suresh and Steve,
The beam scanner is back from repair. 
Koji and Suresh helped to move the I/O address
 P1070024.JPG 
  14058   Thu Jul 12 15:15:47 2018 SandrineUpdate Beat Note Measurements for Cavity Scans(Gautam, Sandrine)

We calculated the expected power
of the beat note for Annalisa's Y arm
  
  10333   Tue Aug 5 19:05:41 2014 AkhilUpdateGeneralBeat Note Testing on EPICS Channels    
  8721   Wed Jun 19 01:45:49 2013 ManasaUpdateGreen LockingBeat frequency sweep for 3FSRMeasurements:
1. Calibrating offset :
 findIR.pngfindIR1.png 
  11470   Thu Jul 30 15:58:00 2015 ericqUpdateLSCBeat note Alignment fluctuation effects measured



 RF_RIN.pngRF_RINspec.pngRFampCoh.xml.zip 
  11478   Tue Aug 4 03:02:30 2015 ericqUpdateLSCBeat note Alignment fluctuation effects measuredNotes from tonight's work:


PMC alignment tweaked.
Not much gained
WFS/MC2 offsets
 coherences.pnglinX.png 
  4502   Thu Apr 7 21:58:57 2011 AidanSummaryGreen LockingBeat note amplitudeHaving convinced myself that the green
Hartmut PD is giving an acceptable response
at RF frequencies I decided to double-check
  
  4534   Fri Apr 15 22:54:20 2011 Aidan, BryanUpdateGreen LockingBeat note amplitude on Vertex PDI was investigating the beat note amplitude
on the vertex PD again yesterday. The incident
power on the PD was 150uW in the PSL green
  
  8386   Mon Apr 1 23:22:17 2013 AnnalisaUpdateAuxiliary lockingBeat note between "Alberto" NPRO laser and PSL laserI measured the beat note between the "Alberto"
NPRO laser and the PSL varying the PSL temperature
and find the matching NPRO temperature that
 Beat_Note.jpg 
  8396   Tue Apr 2 22:39:17 2013 AnnalisaUpdateAuxiliary lockingBeat note between "Alberto" NPRO laser and PSL laser 
 The beat note between the PSL
laser and the "Alberto" NPRO laser
 Beat_note_3col.jpg 
  8345   Mon Mar 25 23:20:57 2013 AnnalisaSummaryAuxiliary lockingBeat note found![Annalisa, Manasa]
The beat note between the main PSL
and the auxiliarly NPRO has been found!
  
  8368   Thu Mar 28 19:32:22 2013 AnnalisaSummaryAuxiliary lockingBeat note found! 
 I plot the variation of the
beat note frequency as a function of "Alberto"
 BeatFreq.jpg 
  10918   Sat Jan 17 15:07:28 2015 manasaUpdateGeneralBeat note frequency discrepancyI
was around the PSL table and the X end table
today.
  
  10956   Thu Jan 29 11:59:48 2015 manasaUpdateGeneralBeat note frequency discrepancyBelow is the set of plots comparing measurements
for the green and IR beat notes frequencies.
The measurements were made on the spectrum
 Freq_compare1.pngFreq_compare2.png 
  8361   Wed Mar 27 21:53:21 2013 AnnalisaUpdateABSLBeat note of ATF auxiliary laserAfter measuring the beat note, the "Alberto"
NPRO auxiliary laser has been moved from
the PSL table to the POY table. Its beam
  
  8369   Thu Mar 28 23:00:30 2013 AnnalisaUpdateABSLBeat note of ATF auxiliary laser found 
The beat note for the ATF lab laser
has been found. 
  
  8333   Fri Mar 22 23:23:38 2013 AnnalisaUpdateLockingBeat note still missing[Annalisa, Manasa, Koji]
I updated the setup for the beat
note. The main reason is that I needed to
 Beat_note_-_new_setup.jpg 
  8819   Wed Jul 10 02:28:04 2013 AnnalisaUpdateGreen LockingBeat notes lost![Manasa, Jenne, Annalisa]
I was going to find the beat note
to start the cavity scan, but I couldn't.
  
  13566   Mon Jan 22 12:48:48 2018 KojiSummaryGeneralBeat setup for aLIGO EOM testI'm planning to construct a beat setup
between the PSL and AUX beams. I am going
to make it in the area shown in a blue square
 IMG_3048.JPG 
  5860   Thu Nov 10 05:54:23 2011 kiwamuUpdateGreen LockingBeat-note detected : PSL vs Y arm[Katrin / Kiwamu]
The beat-note
 DSC_3606_small.jpg 
  11361   Mon Jun 15 22:36:40 2015 rana, kojiUpdateGreen LockingBeatBox Assay: not looking goodBecause the ALS beatbox schematic is out-of-date
and misleading, we pulled the box to photograph
the current implementation and figure out
  
  11363   Fri Jun 19 01:24:26 2015 rana, kojiUpdateGreen LockingBeatBox Assay: not looking goodWe had decided a few days ago, to bypass
the IF part of the BeatBox board and put
some of the Haixing Maglev generic filter
  
  11364   Fri Jun 19 01:55:35 2015 ericqUpdateGreen LockingBeatBox Assay: not looking good


  
  13957   Wed Jun 13 22:07:31 2018 gautamUpdateALSBeatMouth PDFR measurementSummary:

Neither
 IMG_7056.JPGBeatMouthPDFR.pdfBeatMouth_PDFRdata.tgz 
  13973   Fri Jun 15 14:22:05 2018 gautamUpdateALSBeatMouth PDFR measurementI did the measurement with the BeatMouth
open today. Main changes:


Directly pipe the RF output
 BeatMouthPDFR.pdfBeatMouth_PDFRdata.tgz 
  14498   Thu Mar 28 19:40:02 2019 gautamUpdateALSBeatMouth with NF1611s assembledSummary:

The parts I was waiting for arrived.
I finished the beat mouth assembly, and did
 IMG_7381.JPGIMG_7382.JPGrelTF_schem.pdfdarkNoise.pdf 
  14502   Fri Mar 29 21:00:06 2019 gautamUpdateALSBeatMouth with NF1611s installed
Newfocus 15V current limited supply
was taken from bottom NE corner of the ITMY
Oplev table to power the BeatMouth on the
 IMG_7384.JPGIMG_7385.JPG 
  8807   Mon Jul 8 21:46:31 2013 manasaUpdateGreen LockingBeatbox[Koji, Manasa]
I wanted to investigate on the ALS
electronics(in particular the beatbox and
  
  8855   Tue Jul 16 10:16:23 2013 KojiUpdate Beatbox XARM whitening modifiedThe
X arm whitening filters of the beatbox were
modified.
 Beatbox_mod.pdfALS_whitening.pdfBeatbox_input_dependence.pdf 
  8818   Wed Jul 10 02:10:41 2013 manasaUpdateGreen LockingBeatbox gets a makeover

    

       
            
 IMG_0842.JPGIMG_0844.JPGIMG_0845.JPGIMG_0846.JPG 
  11355   Fri Jun 12 17:09:58 2015 ericqUpdateLSCBeatbox needs whitening gainShort entry just to preview a new development;
more detail about this investigation will
soon follow. 
 beatGain.png 
  11356   Sat Jun 13 18:37:46 2015 ericqUpdateLSCBeatbox needs whitening gainHere are the promised details!

I was worried about the lack of
whitening gain, as I saw that the DC phase
 ADCdiagnosis.png 
  11357   Sat Jun 13 23:52:14 2015 ericqUpdateLSCBeatbox needs whitening gainNice find!

We ought to use our noise model
of the ALS signal chain to determine what
  
  8245   Wed Mar 6 20:21:34 2013 JamieUpdateGeneralBeatbox pulled from rackI pulled the beatbox
from the 1X2 rack so that I could try to
hack in some output whitening filters. 
 2013-03-06-195232_1060x927_scrot.png 
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