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ID Date Author Type Categoryup Subject Text Attachments
  7891   Fri Jan 11 11:07:04 2013 ManasaUpdateGeneralIFO status update - PMC problemsI came in this morning to see that the
PMC was down. The PZT voltage had drifted
to below 50V. I adjusted the FSS slow controls
  
  7892   Fri Jan 11 16:13:47 2013 JenneUpdateGeneralIFO status update - PMC fixed


   
        
            
  
  7930   Wed Jan 23 18:16:11 2013 ManasaUpdateGeneralLaseroptik mirror - SN6 I repeated the transmittance measurements
of LaserOptik SN6 @1064nm.
Transmittance for s-polarization 
 sn6_trans.png 
  7932   Wed Jan 23 20:24:05 2013 KojiUpdateGeneralLaseroptik mirror - SN6Got confused (even after I talked with
Manasa).
The plot shows the number ~0.01 or
  
  7935   Wed Jan 23 22:02:25 2013 ManasaUpdateGeneralLaseroptik mirror - SN6

    

       
            
  
  7940   Thu Jan 24 15:16:50 2013 ManasaUpdateGeneralLaseroptik mirror - SN6I repeated the transmittance measurements
of Laseroptik SN6 at 1064nm. The rotation
stage could only resolve 2 deg rotation (We
 sn6_trans1.png 
  7941   Thu Jan 24 16:23:24 2013 KojiUpdateGeneralLaseroptik mirror - SN6The mirror T is completely out of spec.
We should find or request the data sheet
of the mirror.
  
  7943   Thu Jan 24 16:34:56 2013 ranaUpdateGeneralLaseroptik mirror - SN6  I have two questions:
1) Are we sure that the T measurement
is not being compromised by some systematic?
  
  7944   Fri Jan 25 08:10:42 2013 SteveUpdateGeneralLaseroptik mirrors Here are the German plots. Unfortunately
they are not logarithmic. 
 Ed: Proprietary data removed.
  
  7947   Mon Jan 28 19:07:45 2013 ManasaUpdateGeneralSN6 Laseroptik mirror - Tranmittance measurementsI repeated the measurements using NPRO
instead of Crystalaser. I am attaching optical
layouts for these measurements for future
 sn6_trans0128.pngtrans_layout.png 
  7950   Mon Jan 28 21:36:44 2013 tall guyFrogsGeneralsmall people on noticeIf I catch anyone putting small booties
into the large bootie bin, I will make said
person eat small booties.
  
  7952   Tue Jan 29 10:59:37 2013 lazy personFrogsGeneralbetter plan 
 I propose we work around this
problem with giant
  
  7953   Tue Jan 29 14:20:02 2013 KojiUpdateGeneralFiner rotation stage for optics characterizationA rotation stage has been ordered.

  
  7955   Tue Jan 29 15:16:18 2013 ManasaFrogsGeneraltrial run 
 I would like to suggest a trial
run on these....Ergomates and 
 ErgoMatesFeatures.jpgbooties.jpg 
  7958   Tue Jan 29 20:28:11 2013 ericqUpdateGeneralEarly work on Mirror Mounts [Q, Chloe]
Chloe has been to the lab twice to
start up her investigations in acoustic noise
 early.pdf 
  7960   Wed Jan 30 03:01:55 2013 KojiUpdateGeneralEarly work on Mirror MountsI
can't believe that SR785 can have
such a low input noise level (<1nV/rtHz).
  
  7967   Wed Jan 30 16:24:25 2013 ManasaFrogsGeneraltrial run

    

       
            
  
  7989   Sun Feb 3 13:20:02 2013 KojiSummaryGeneralHypothesisRana mentioned the possibility that the
PR2 curvature makes the impact on the mode
stability. Entry
 mode_density_PRC.pdfmode_density_PRC.zip 
  7990   Mon Feb 4 10:45:51 2013 JamieSummaryGeneralrough analysis of aligned PRM-PR2 mode scanHere's a sort of rough analysis of the
aligned PRM-PR2 cavity mode scan.
On Friday we took some mode scan
 scan-labeled.pdf 
  7991   Mon Feb 4 11:10:59 2013 KojiSummaryGeneralrough analysis of aligned PRM-PR2 mode scanThe expected finesse is 100ish. How much
can we beleive the measured number of 50?
From the number we need to assume
  
  7992   Mon Feb 4 15:06:56 2013 KojiSummaryGeneralHypothesis

    

       
            
  
  7994   Mon Feb 4 19:33:19 2013 yutaSummaryGeneralrough analysis of aligned PRM-PR2 mode scan[Jenne, Yuta]

We redid PRM-PR2 cavity scan because
 3peakdata.png 
  7995   Mon Feb 4 19:48:32 2013 JamieSummaryGeneralarbcav recalc of PRC with correct ITM transmissionI noticed that Koji used a high reflector
for the ITMs for his full PRC arbcav calculation.
 I just redo it here with the correct ITM
 mode_density_PRC_2.pdfmode_density_PRC_3.pdf 
  7996   Mon Feb 4 22:46:03 2013 JamieSummaryGeneralarbcav for SRC with curved TTsI ran Zach's arbcav on our SRC with curved
TTs and the situation looks much worse than the PRC.
 mode_density_SRC_3.pdfmode_density_SRC_2.pdf 
  7997   Tue Feb 5 02:04:44 2013 yutaSummaryGeneralrough analysis of aligned PRM-PR2 mode scanI redid PRM-PR2 cavity scan using oscilloscope
to avoid anti-aliasing effect.
Measured 
 PRMPR2scan.png 
  7998   Tue Feb 5 03:16:51 2013 KojiSummaryGeneralrough analysis of aligned PRM-PR2 mode scan0.764 and 0.751 do not give us the stdev
of 0.005.
I have never seen any Yokogawa in
  
  8000   Tue Feb 5 10:09:08 2013 yutaSummaryGeneralrough analysis of aligned PRM-PR2 mode scanstdev of [0.764, 0.751] is 0.007, but what
we need is the error of the averaged number.
Statistical error of the averaged number
  
  8002   Tue Feb 5 11:30:19 2013 KojiSummaryGeneralrough analysis of aligned PRM-PR2 mode scanMakes sense. I mixed up n and n-1
Probability function: X = (x1 + x2
+ ... + xn)/n, where xi = xavg +/- dx
  
  8004   Tue Feb 5 15:31:03 2013 SteveUpdateGeneralclean assembly room benches cleaned upManasa, Jamie and Steve,
Tip-Tilts and parts moved into the
most north " 40m "  cabinet 
 IMG_0057.JPGIMG_0061.JPG 
  8005   Tue Feb 5 19:16:22 2013 JamieSummaryGeneralarbcav of PRC with +600 RoC PR2/3This is just a simple rerun of arbcav from
#7995
but with the PR2/3 RoCs set to 600, instead
 mode_density_PRC_3.pdfmode_density_PRC_2.pdf 
  8006   Tue Feb 5 19:32:47 2013 yutaSummaryGeneralPR2/PR3 flipping and PRC stabilityWe are considering of flipping PR2 and/or
PR3 to make PRMI stable because PR2/PR3 seems
to be convex.
 PRMI_PR2HR_PR3HR.pngPRMI_PR2AR_PR3HR.pngPRMI_PR2HR_PR3AR.pngPRMI_PR2AR_PR3AR.png 
  8012   Wed Feb 6 15:20:55 2013 yutaSummaryGeneralFWHM was wrongI have to blame Jamie for putting extra
2 randomly.
Measured PRM-PR2 cavity 
  
  8019   Wed Feb 6 22:39:23 2013 JamieUpdateGeneralPRC/arm mode matching with flipped PR2/PR3: coming soonI intended to post a long analysis of the
PRC/arm mode matching for the various TT
situations using Nic's a
  
  8020   Thu Feb 7 09:03:54 2013 ManasaUpdateGeneralStore optics in respective cabinets
@Yuta
The ITMX table has been left open since
  
  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
  
  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 
  8025   Thu Feb 7 17:10:11 2013 KojiSummaryGeneralPRC/arm mode matching calculations

    

       
            
  
  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
  
  8033   Fri Feb 8 11:07:07 2013 JamieSummaryGeneralPRC/arm mode matching calculations

    

       
            
  
  8035   Fri Feb 8 12:42:45 2013 nicolasSummaryGeneralPRC/arm mode matching calculations

    

       
            
  
  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 
  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
  
  8059   Mon Feb 11 17:17:30 2013 JamieSummaryGeneralmore analysis of half PRC with flipped PR2

    

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

    

       
            
  
  8074   Wed Feb 13 01:26:08 2013 yutaSummaryGeneralrough analysis of aligned PRM-PR2 mode scanKoji was correct.

When you estimate the variance of
 unbiased.png 
  8078   Wed Feb 13 19:09:32 2013 yutaSummaryGeneralpossible explanations to oval REFL beam[Jenne, Manasa, Jamie, Yuta]

The shape of the REFL beam reflected
 REFL_1044844506.bmp 
  8079   Wed Feb 13 19:30:45 2013 KojiSummaryGeneralpossible explanations to oval REFL beam>> "What has changed since:"
Recently
the REFL path has been rearranged
  
  8080   Wed Feb 13 19:41:07 2013 yutaSummaryGeneralpossible explanations to oval REFL beamWe checked that REFL beam is already oval
in the vacuum. We also centered in-air optics,
including lens, in the REFL path, but REFL
  
  8087   Fri Feb 15 09:58:49 2013 SteveUpdateGeneralbeam traps ready to be installedBlack-green glass traps are ready for light
in vacuum. I can assemble more if needed.
These three sizes are available.
 IMG_0083.JPGIMG_0084.JPG 
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