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ID Date Authorup Type Category Subject Text Attachments
  11810   Wed Nov 25 16:40:32 2015 yutaroUpdateLSCround trip loss of Y armI measured round trip loss of Y arm. The
alignment of relevant mirrors was set ideal
with dithering (no offset).
  
  11813   Wed Nov 25 22:37:12 2015 yutaroUpdateLSCremoval of Gautam's cable in 1Y2 and restoration of POYDC[yutaro, Koji]

We disconnected the cable that
was connected to CH5 of the whitening filter in
  
  11814   Wed Nov 25 22:59:42 2015 yutaroUpdateLSCAS table optics realignmentI slightly changed the orientation
of a few mirrors on AS table that
are used to make the AS light get into PDs,
  
  11815   Wed Nov 25 23:17:34 2015 yutaroUpdateLSCstrange behavior of ASDC[yutaro, Koji]

I noticed that ASDC level changes
depending on the angle of ITMY when trying
 14.png 
  11816   Wed Nov 25 23:34:52 2015 yutaroUpdateLSCround trip loss of Y arm[yutaro, Koji]

Due to the strange behavior (elog
 14.png 
  11818   Fri Nov 27 03:38:23 2015 yutaroSummaryLSCround trip loss of Y armTonight I measured "loss map"
of ETMY. The method to calculate round trip
loss is same as written in elog
 image1.png 
  11819   Fri Nov 27 22:20:24 2015 yutaroUpdateLSCround trip loss of Y armHere, I upload data I took last night,
including the power of reflected power (locked/misaligned)
and transmitted power for each point (attachement
 log.txt.zip17.png 
  11820   Sat Nov 28 11:46:40 2015 yutaroUpdateLSCpossible error source of loss map measurementI found that TRY level degraded and the
beam shape seen with CCD camera at AS port
was splitted when the beam spot on ETMY was
  
  11823   Mon Nov 30 10:41:45 2015 yutaroUpdateLSCDoes a baffle in front of ETMY have effect on loss map measurement?It might have, so I think
I need to estimate shift of beam spot
more preciely.
  
  11824   Mon Nov 30 12:19:38 2015 yutaroUpdateComputer Scripts / Programsimage captureOn VIDEO.adl, Image Capture and Video Capture
did not seem to work and gave me some errors,
so I fixed following two things:
  
  11828   Mon Nov 30 17:17:30 2015 yutaroUpdateLSCDoes a baffle in front of ETMY have effect on loss map measurement?With captured images of ETMYF, I measured
the shift of the beam spot on ETMY.

The conclusions are:
 element2-2.pngelement0-0.pngelement4-4.png 
  11831   Tue Dec 1 11:26:23 2015 yutaroUpdateOptical LeversCalibration of oplevs for ITMX/ETMXWith the same method as reported in elog
11785, I calibrated oplevs for ITMX/ETMX.
 ep_l.pdfey_l.pdfip_l.pdfiy_l.pdf 
  11838   Wed Dec 2 15:52:28 2015 yutaroUpdateLSCrestoration of POXDCI disconnected the   
  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 
  11843   Thu Dec 3 10:05:07 2015 yutaroUpdateOptical LeversCalibration of oplevs for ITMX/ETMXI updated the figures. I think it's
easier to read now.
  
  11845   Thu Dec 3 19:10:28 2015 yutaroUpdateLSCXARM lock with ITMX actuated and related change on ASSTo avoid the strange kicking of ETMX, I
locked XARM with ITMX actuated instead of
ETMX so that I changed elements of C1LSC_OUTPUT_MTRX;
 40.png 
  11846   Fri Dec 4 10:18:33 2015 yutaroUpdateASSOffset in the dither loop of XARM vs beam spot shift on ETMXAs I did for YARM (elog
11779), I measured the relation between
offsets added just after the demodulation
 offset-angleETMXPIT.pngoffset-angleETMXYAW.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 
  11851   Sat Dec 5 12:02:25 2015 yutaroHowToCamerasWhen image capture does not work...Today image capture did not work again,
though it had worked 3 days before. I also
found that red indicator light on the
  
  11853   Sat Dec 5 21:57:32 2015 yutaroHowToCamerasWhen image capture does not work...I don't know if just running "modprobe"
will work or not, because I didn't try
it...  When the same problem happens
  
  11855   Mon Dec 7 10:40:09 2015 yutaroUpdateComputer Scripts / ProgramsAdded 1 line to UNFREEZE_DITHER.pyI added 1 line to one of the ASS scripts,
UNFREEZE_DITHER.py like this:

L29>   ez.cawrite('C1:ASS-'+dof+'_GAIN',
  
  11857   Mon Dec 7 11:11:25 2015 yutaroSummaryLSCround trip loss of X armOn the day before yesterday and in this
morning, I measured loss map of ETMX. I reported
the method I used to change the beam spot
 image1-2.JPGsymmetry.png 
  11860   Mon Dec 7 15:56:35 2015 yutaroUpdateLSCXARM lock with ITMX actuated and related change on ASSI changed the snapshot file for ASS, /opt/rtcds/caltech/c1/scripts/ASS_DITHER_ON.snap
as follows:
  
  11861   Tue Dec 8 11:24:45 2015 yutaroSummaryComputer Scripts / ProgramsScripts for loss map measurementHere I explain usage of my scripts
for loss map measurement. There are 7 script
files in a same directory /opt/rtcds/caltech/c1/scripts/lossmap_scripts. With
  
  11864   Tue Dec 8 15:57:16 2015 yutaroSummaryLSCPower recycling gain estimation from arm loss measurementI estimated power recycling gain with the
results of arm loss measurement.

From elog
  
  11870   Thu Dec 10 12:33:04 2015 yutaroUpdateLSCstrange behavior of ASDCI did additional tests for the strange
behavior of ASCD. ETMY, ETMX and ITMY were
misaligned so that only light reflected by
 07.png28.pngASDC.png 
  11871   Thu Dec 10 19:53:22 2015 yutaroUpdateLSCstrange behavior of ASDCTo check if the strange behavior of ASDC
is caused by SR2/SR3 or not, I did the following
measurement:
 30.png11.png49.png 
  11872   Fri Dec 11 09:35:44 2015 yutaroUpdateLSCPower recycling gain estimation from arm loss measurementI took PR3 AR reflectivity and calculated
PRG (PR3 is flipped and so AR surface is
inside PRC).
 LaserOptikAR.png 
  11874   Fri Dec 11 15:37:50 2015 yutaroUpdateLSCPower recycling gain estimation from arm loss measurementAttached is the plot of relation between
the average arm round trip loss and
power recycling gain. 2 % loss due to PR3
 PRG_plot.png 
  11875   Fri Dec 11 16:16:36 2015 yutaroUpdateOptical LeversCalibration of oplevs for ITMX/ETMXBased on calibration measurement I have
done (elog
11785, 11831), I
  
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