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ID Date Authorup Type Category Subject Text Attachments
  6942   Mon Jul 9 05:15:46 2012 yutaUpdateGreen Lockinglocked MI while ALS using ASDCI locked MI while both arm length are stabilized
at IR resonance. This could be done using
DC READOUT,
 FPMIALStrial20120709.png 
  6947   Mon Jul 9 23:18:09 2012 yutaUpdateLSCPRMI got more stable a bitI modified filiters for LSC_MICH and LSC_PRCL.
Although modes we can see at POP and
AS look still bad, error signals are less
 LSCMICHOLTF.pngLSCPRCLOLTF.pngALL_1025928219_PRMIlocked3.pngPRMIbeammotion20120709.png 
  6950   Tue Jul 10 03:16:17 2012 yutaUpdateLSCPRMI got more stable a bitI modified filiters for LSC_MICH and LSC_PRCL
again to cope with power recycling gain fluctuation.
After some more alignment, power recycling
 LSCMICHOLTF.pngLSCPRCLOLTF.pngPRMI20120709_2.png 
  6952   Tue Jul 10 17:47:55 2012 yutaUpdateSUSPRM oplevs fixedI centetered PRM oplev, lowered gain and
PRM oplev servo is not oscillating any more.
It is OK for more than a softball
 PRMoplevpitOLTF.pngPRMoplevyawOLTF.pngPRMOplevSpectra20120710.png 
  6953   Tue Jul 10 21:37:05 2012 yutaUpdateLSCPRMI glitch studyPRMI
glitch certainly comes from power recylcing
gain fluctuation.
 PRMIgilitch20120709.pngPRMIgilitch20120709_closer.png 
  6954   Wed Jul 11 02:25:11 2012 yutaUpdateLSCPRMI beam spot motion might be from PRM/BS motionMy hypothesis from the measurements below,
to explain PRMI beam spot motion is;
 POPDCASDC4.pngFeedback4.pngOLPITYAWandPOPDC4.pngOLPITYAWandPOPDCunlocked.png 
  6955   Wed Jul 11 03:53:41 2012 yutaUpdateLSCBS 3.3 Hz motion on MIIt is not as dramatic as PRMI, but I could
see BS 3.3 Hz motion at AS and REFL when
MI is locked at dark fringe.
 REFLDCASDCMIlocked.png 
  6960   Wed Jul 11 13:36:58 2012 yutaUpdateSUSOSEM and oplev spectra of opticsBelow is angular spectra of every suspended
core optics.
As you can see, there's a peak at
 OLPITYAW.pngSUSPITYAW.png 
  6964   Wed Jul 11 16:19:08 2012 yutaUpdateSUSoplev servo phiologyI heard that Steve did great work on oplev
in Feb 2012.
Here's summary what happened to oplev
  
  6965   Thu Jul 12 02:12:42 2012 yutaUpdateSUSBS 3.3 Hz motionI tried to reduce BS 3.3 Hz motion with
local damping. 3.3 Hz probably comes from
the stack, but I want to reduce this because
 BSdam.pngBSOLSUSresonantgain.png 
  6967   Thu Jul 12 13:27:16 2012 yutaUpdateSUSmeasured OLTFs of PRMI optics' SUSPOSI measured openloop transfer functions
of PRM/BS/ITMX/ITMY SUSPOS servo.
They look great. They all have ~50
 PRMSUSPOSOLTF.pngBSSUSPOSOLTF.pngITMXSUSPOSOLTF.pngITMYSUSPOSOLTF.png 
  6972   Thu Jul 12 23:15:34 2012 yutaUpdateLSCPRMI LSC is making PRM motion worseIt looks like PRMI LSC is making PRM motion (and
BS motion) at ~3Hz worse.
 PRMBSPRMIonoff.pngITMXITMYPRMIonoff.pngOplevPRMIonoff.png 
  6974   Fri Jul 13 15:49:38 2012 yutaBureaucracyGeneral40m Priority Action ItemsThese are all priority action items need
to be done before I come back (in mid-September).
  
  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 
  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 
  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
  
  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 
  
  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
  
  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 
  
  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.
  
  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 
  
  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
  
  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 
  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 
  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 
  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;
  
  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 
  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
  
  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 
  8073   Tue Feb 12 23:24:17 2013 yutaUpdateAlignmentIFO alignment in prep for in-air PRMI[Manasa, Yuta]

Lot's of alignment work, 
  
  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 
  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
  
  8082   Thu Feb 14 00:10:12 2013 yutaSummaryAlignmentREFL is not clippedLet's wait for astigmatism calculation.

In either case(clipping or astigmatism),
  
  8091   Fri Feb 15 20:07:28 2013 yutaUpdateAlignmentPOP path set up but AS55 is broken[Manasa, Yuta]

We set up POP camera and POPDC PD,
  
  8092   Fri Feb 15 21:22:29 2013 yutaUpdateElectronicsAS55 replaced with POP55 PDI temporarily replaced AS55 PD with PD
labeled "POP55(POY55)".
I think POP55 is working because I
  
  8093   Sat Feb 16 17:27:26 2013 yutaUpdateSUSPRM coil balancedPRM coil gains and f2a filters are adjusted
for PRMI work.
It seems like 
 PRM_f2a.png 
  8094   Sat Feb 16 18:32:01 2013 yutaSummaryRF Systemphase tracker: OLTFI measured openloop transfer function of
the phase tracking loop for the first characterization
of phase tracker.
 BEATXFINEPHASE_OLTF.pngBEATYFINEPHASE_OLTF.pngphasetracker.png 
  8095   Sat Feb 16 19:23:17 2013 yutaUpdateLSCPR2 flipped PRMI lockedIt is my pleasure to announce that the
first lock of PR2 flipped PRMI was succeeded.
  
  8099   Mon Feb 18 18:28:01 2013 yutaBureaucracyAlignmentwe are going to pump downWe
will start preparing for pumping down. Main
goal for this is to demonstrate PRFPMI using
  
  8102   Tue Feb 19 00:21:09 2013 yutaUpdateElectronicsPOP path set up but AS55 is brokenHmm......  
I thought AS55 is broken because it
was not responding to the AS beam nor flashlight
  
  8103   Tue Feb 19 02:23:40 2013 yutaBureaucracyGeneralaction items for PRFPMIThese are things need to be done for demonstrating
PRFPMI using ALS.
All of these should be done before
  
  8105   Tue Feb 19 08:06:02 2013 yutaUpdateElectronicsPOP path set up but AS55 is brokenI didn't use LED flash light. We learned
from the past (elog
#7355). I checked that POP55 and REFL55/165/33/11
  
  8112   Tue Feb 19 19:55:52 2013 yutaUpdateIOOMC yaw input tuned[Jenne, Manasa, Yuta]

Since we levelled IMC stack, we had
 MCdecenter_19Feb2013.png 
  8114   Wed Feb 20 03:13:10 2013 yutaUpdateAlignmentclipping centering checklistI attached clipping/centering checklist
for the alignment.
Blue
 ClippingCenteringChecklist.pdf 
  8115   Wed Feb 20 10:13:41 2013 yutaUpdateAlignmentPRC flashing brighter than last weekAfter in-vac alignment work last night,
PRC is flashing brighter than PRMI alignment
last week.
  
  8119   Wed Feb 20 19:48:16 2013 yutaUpdateAlignmentBS table oplev re-arranged[Sendhil, Yuta]

After aligning IFO and putting the
 IFOALIGN_QPDs_OSEMs.png 
  8121   Wed Feb 20 20:15:29 2013 yutaUpdateAlignmentSRM oplev statusCurrently, SRM is misaligned in pitch so
that SRM reflected beam hits on the top edge
of SR3 (not on the mirror, but on the cage
  
  8122   Wed Feb 20 20:58:37 2013 yutaUpdateAlignmentclipping centering checklistBlue
ones are the ones we checked yesterday.
Green
 ClippingCenteringChecklist.pdf 
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