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  40m Log, Page 181 of 341  Not logged in ELOG logo
ID Date Author Type Category Subject Text Attachments
  8069   Tue Feb 12 18:28:46 2013 JamieSummaryOpticsCurvature radii of the G&H/LaserOptik mirrors

    

       
            
  
  8068   Tue Feb 12 18:25:43 2013 JamieSummaryGeneralhalf PRC with astigmatic PR2/3

    

       
            
  
  8067   Tue Feb 12 17:26:31 2013 ChloeUpdate QPD circuitry to test mount vibrations I spent awhile today reading about
op-amps and understanding what would be necessary
to design a circuit which would directly
  
  8066   Tue Feb 12 00:50:08 2013 yutaUpdateLockingPR2 oplev spectraI wanted to see if PR2 motion makes PRC
beam motion or not, using temporary oplev
to PR2.
 PR2oplev.png 
  8065   Tue Feb 12 00:14:00 2013 yutaUpdateLockingPRM coil balancingWe tried to lock half-PRC tonight, but
we couldn't. Why?? I could lock yesterday.
It locks for ~ 1 sec, but it beam
  
  8064   Mon Feb 11 21:03:15 2013 yutaUpdateLockingPR2-flipped half-PRC mode scanTo estimate the systematic effects to the
g-factor measurement, I changed how to analyze
the data in multiple ways.
 modespacing_pit.pngmodespacing_yaw.png 
  8063   Mon Feb 11 19:55:47 2013 ManasaUpdateOpticsG&H - AR Reflectivity  
I adjusted the focal length of the
focusing lens and reduced the beam size enough
  
  8062   Mon Feb 11 18:44:34 2013 JamieUpdateComputerspasswerdz changed

    

       
            
  
  8061   Mon Feb 11 18:39:10 2013 ChloeUpdateGeneralPictures of Circuitry in PhotodiodeI am going to be making measurements to
find the optical mounts with the least noise.
I am using a quadrature photodiode to record
 IMG_0327.JPGIMG_0329.JPG 
  8060   Mon Feb 11 17:54:02 2013 KojiSummaryOpticsCurvature radii of the G&H/LaserOptik mirrorsI, by chance, found  that my windows
partition has Vision32 installed.
So I run my usual curvature characterization
 TT_Mirrors_RoC.pdf 
  8059   Mon Feb 11 17:17:30 2013 JamieSummaryGeneralmore analysis of half PRC with flipped PR2

    

       
            
 foo.pdf 
  8058   Mon Feb 11 16:29:33 2013 JenneUpdateLockingTemp oplev for PR2; ITMX temporarily has no oplev[Yuta, Jenne]
In an effort to see what is going
on with the beam spot motion, and to investigate
  
  8057   Mon Feb 11 16:16:27 2013 SteveUpdateVAC55 days at atmoshereCP
Stat 100  sheet-covers were replaced
by clean ones on open chambers BS, ITMX,
 atm55d.png 
  8056   Mon Feb 11 13:15:16 2013 yutaUpdateLockingPR2-flipped half-PRC mode scanI found a mistake in my code (thanks Jamie!).
I forgot to square the g-factor.
I corrected the following elogs;
  
  8055   Mon Feb 11 13:07:17 2013 Max HortonUpdateSummary PagesFixed A Calendar BugUnderstanding the Code:  Documented
more functions in summary_pages.py. 
Since it is very difficult and slow to understand
  
  8054   Mon Feb 11 12:49:54 2013 JenneSummaryLSCResonant freq change - why? (and passive TT mode freqs)

    

       
            
  
  8053   Sun Feb 10 18:00:13 2013 yutaSummaryLSCPR2-flipped half-PRC spectra/OLTFTo compare with future PRMI locking, I
measured spectra of POPDC and feedback signal.
I also measured openloop transfer function
 POPDCLSCPRM.pngLSCPRCLOLTF.png 
  8052   Sun Feb 10 17:30:39 2013 yutaUpdateLockingPR2-flipped half-PRC mode scanI redid half-PRC mode scan by applying
mislignment to PRM.
Half-PRC's
 modescan_pitmisalign.pngmodescan_yawmisalign.png 
  8051   Sat Feb 9 19:34:34 2013 ranaUpdateOpticsG&H - AR Reflectivity  
 Use the trick I suggested:
Focus the beam so that the beam size
  
  8050   Sat Feb 9 11:25:35 2013 KojiUpdateLockingPR2-flipped half-PRC mode scanDon't  Shouldn't you
apply a small misalignment to the input beam?
Isn't that why the peak for the 1st-order
  
  8049   Fri Feb 8 23:59:42 2013 yutaUpdateLockingPR2-flipped half-PRC mode scanI did mode scan of PR2-flipped half-PRC
to see if it behaves as we expect.
Measured
 halfPRCmodescan.png 
  8048   Fri Feb 8 23:22:48 2013 DenSummaryModern Controlprogress report I wrote a small document on the application
of LQG method to a Fabry-Perot cavity control.
 LQG.pdf 
  8047   Fri Feb 8 23:04:40 2013 ManasaUpdateOpticsG&H - AR Reflectivity

    

       
            
  
  8046   Fri Feb 8 22:49:31 2013 KojiUpdateOpticsG&H - AR Reflectivity How about to measure the AR reflectivity
at larger (but small) angles the extrapolate
the function to smaller angle, 
  
  8045   Fri Feb 8 21:14:52 2013 ManasaUpdateOpticsG&H - AR Reflectivity  Hours of struggle and still no
data 
 pr2.png27_1044419003.bmp 
  8044   Fri Feb 8 20:27:56 2013 KojiUpdateRF SystemMC REFL Photodiode transimpedanceThe comment itself was added by me. 
The difference between the previous
  
  8043   Fri Feb 8 20:05:15 2013 JenneUpdateLockingPRMI workI fixed up the POP path so that there is
no clipping, so that Yuta can take a cavity
mode scan.
  
  8042   Fri Feb 8 19:39:02 2013 KojiUpdateLockingPRMI workIt seems that the cavity trans looks much
better than before. Cool.
  
  8041   Fri Feb 8 19:29:44 2013 yutaSummaryGeneralarbcav of half PRC with flipped PR2We need expected finesse and g-factor to
compare with mode-scan measurement. Can you
give us the g-factor of the half-PRC and
  
  8040   Fri Feb 8 18:23:32 2013 JamieSummaryGeneralarbcav of half PRC with flipped PR2Arbcav with half PRC (flat temporary mirror
in front of BS), PR2 RoC = 600m, PR3 RoC
= -600m:
 prm23t-modes.pdfprm23t-geometry.pdf 
  8039   Fri Feb 8 17:41:34 2013 JenneUpdateLockingPRMI work 
 [Yuta, Jenne]
After much tweaking of the alignment
  
  8038   Fri Feb 8 17:15:56 2013 JenneUpdateRF SystemMC REFL Photodiode transimpedanceThis measurement was done already about
a week ago, in elog 7984. 
Can you please describe why the numbers for
  
  8037   Fri Feb 8 15:53:48 2013 JenneUpdateLockingPRMI work

    

       
            
  
  8036   Fri Feb 8 12:43:26 2013 yutaUpdateComputersvideocapture.py now supports movie capturingI updated /opt/rtcds/caltech/c1/scripts/general/videoscripts.py
so that it supports 
  
  8035   Fri Feb 8 12:42:45 2013 nicolasSummaryGeneralPRC/arm mode matching calculations

    

       
            
  
  8034   Fri Feb 8 12:39:32 2013 yutaUpdateLockingPRMI workHalf-PRC at this time already have two
changes from the previous half-PRC; PR2 replaced/flipped
and different TM before BS.
  
  8033   Fri Feb 8 11:07:07 2013 JamieSummaryGeneralPRC/arm mode matching calculations

    

       
            
  
  8032   Fri Feb 8 11:01:18 2013 JamieUpdateLockingPRMI workI completely agree with Koji.  We
definitely should have locked the half PRC
first.  We were all set up for that. 
  
  8031   Fri Feb 8 02:38:04 2013 KojiUpdateLockingPRMI workI feel it's too hasty to use the PRMI.

I support the idea of the  half-PRC
  
  8030   Fri Feb 8 02:12:14 2013 JenneUpdateLockingPRMI work[Jenne, Yuta]
Lots
  
  8029   Fri Feb 8 00:23:33 2013 ranaSummaryGeneralPRC/arm mode matching calculations 
 I would guess that either flipping
PR2 or PR3 would give nearly the same effect
  
  8028   Thu Feb 7 19:25:22 2013 yutaUpdateCDSC1ALS filters reloadedFilters for C1ALS were all gone. So, I
copied /opt/rtcds/caltech/c1/chans/C1GCV.txt
and renamed it as 
  
  8027   Thu Feb 7 19:24:57 2013 RijuUpdate Photodiode transimpedance Summary:  reflshotnoise.pdf 
  8026   Thu Feb 7 17:24:13 2013 SteveUpdateSAFETYfire extinguishers checkedThe fire department weighted and pressure
checked our units today. Surprisingly they
found one powder filled can. We can only
  
  8025   Thu Feb 7 17:10:11 2013 KojiSummaryGeneralPRC/arm mode matching calculations

    

       
            
  
  8024   Thu Feb 7 15:46:42 2013 JenneUpdateLockingPR2 flippedMore correctly, a different G&H mirror
(which we have a phase map for) was 
  
  8023   Thu Feb 7 14:10:25 2013 ManasaUpdateOpticsLaserOptik - AR Reflectivity - Bad dataReflectivity of AR surface of LaserOptik
(SN6)
 
 SN6_R.pngSN6_R.png 
  8022   Thu Feb 7 12:56:18 2013 JamieSummaryGeneralPRC/arm mode matching calculationsNOTE:
There was a small bug in my initial calculation. 
The plots and numbers have been updated with
 8x 
  8021   Thu Feb 7 10:35:35 2013 yutaUpdateGeneralStore optics in respective cabinetsI'm not the one who opened the ITMX table
yesterday, but thanks for reminding me.
I put POP DC oscilloscope and its
  
  8020   Thu Feb 7 09:03:54 2013 ManasaUpdateGeneralStore optics in respective cabinets
@Yuta
The ITMX table has been left open since
  
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