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ID Date Author Type Category Subject Text Attachments
  8266   Mon Mar 11 10:20:36 2013 Max HortonSummaryComputersAttempted Smart UPS 2200 Battery ReplacementAttempted Battery Replacement on Backup
Power Supply in the Control Room: 
I tried to replace the batteries
 upsB.jpgupsBa.jpg 
  8265   Sun Mar 10 13:29:29 2013 KojiHowToIOOHow to calculate the accumulated round-trip Gouy phaseHow to calculate the accumulated round-trip
Gouy phase (and namely the transverse mode
spacing) of a general cavity
  
  8264   Sat Mar 9 19:29:27 2013 KojiUpdatePSLModulation depthLast night I measured the modulation depth
of the MC incident beam.

Method:
 mod_depth.pdf 
  8263   Fri Mar 8 21:00:05 2013 ManasaUpdatePSLPMC fixed

    

       
            
  
  8262   Fri Mar 8 20:51:00 2013 ManasaUpdateAlignmentInput beam drift - investigation **IMPORTANT**Checking the drift in input pointing
(TT2 is the main suspect)
  
  8261   Fri Mar 8 16:05:56 2013 yutaBureaucracyGeneralaction items for PRMI / ALS-FPMIWe should focus our work both on PRMI and
ALS-FPMI (elog
#8250).
  
  8260   Fri Mar 8 16:02:52 2013 JenneUpdateAlignmentGetting closer to beam centering on YarmI'm working on getting the input beam centered
on the Yarm optics.  To do this, I measured
the spot positions, move the tip tilts, realign
 YARMdecenter_zoom_8Mar2013.png 
  8259   Fri Mar 8 15:27:42 2013 yutaUpdateGreen LockingPSL green shutter installed[Manasa, Yuta]

Mechanical shutter for PSL green is
  
  8258   Fri Mar 8 13:42:35 2013 JenneUpdateABSLBS installed on ITMY tableRe:  POY beam reduction.
We are able to lock the Yarm with
the beam / gain as it is.  I had thought
  
  8257   Fri Mar 8 12:57:57 2013 AnnalisaUpdateABSLBS installed on ITMY table Sendhil and I installed the S polarized
BS on the ITMY table to steer the NPRO beam
through the AR wedge and align it to the
  
  8256   Fri Mar 8 03:07:19 2013 yutaUpdateLSCcalibrated PRM-ITMY length spectraMeasured free swing PRM-ITMY length was
230
nm RMS.
 LSCPRCLOLTF_PRITMY.pngPRITMYmotion.png 
  8255   Fri Mar 8 02:17:04 2013 yutaUpdateLSCcalibration of PRM actuator[Manasa, Yuta]

We measured AC response of PRM actuator
 calibREFL55Q.pngactcalibPRM.pngOLTF_PRCL.png 
  8254   Thu Mar 7 18:48:43 2013 yutaUpdateComputer Scripts / Programsreleasing my secret scriptsI released/updated my secret scripts to
real scripts directory.
I checked they run correctly (but
  
  8253   Thu Mar 7 18:41:03 2013 JenneUpdateElectronicsPOX whitening was fine all alongHere are the transfer functions that we
took back in 2011 (see elog
4915 and replies) for POX:
 POX11I.pngPOX11Q.png 
  8252   Thu Mar 7 18:12:03 2013 yutaUpdateAlignmentInput beam drift ~ 0.1 mrad/h in pitch[Jenne, Manasa, Yuta]

We temporarily centered the beam on
 IPangulardrift.png 
  8251   Thu Mar 7 16:55:28 2013 KojiUpdateLockingErudite discussion on PRMI lockingPRMI for the sidebands may have different
situation. Investigate our wiki to find our
the simulation result.
  
  8250   Thu Mar 7 12:39:12 2013 JenneUpdateLockingErudite discussion on PRMI locking[Rana, Jenne, Yuta] (late last night)
After some trouble getting the PRMI
to lock with REFL55 I&Q last night, we
  
  8249   Thu Mar 7 11:43:15 2013 JenneUpdateElectronicsPOX and POY whitening DC gain left lowManasa and Jan were having trouble locking
the Yarm, and asked me to take a look at
it.  After a good long time of trying
  
  8248   Thu Mar 7 01:43:35 2013 yutaUpdateLSCcalibrated MI differential length spectraFree swing MI differential length is 86 nm
RMS and residual length when locked
 LSCMICHOLTF_MI.pngMImotion.png 
  8247   Wed Mar 6 22:11:19 2013 KojiUpdateElectronicsPOX whitening was fine all alongAt the time you, den and I worked together,
we could not lock the X-arm on TEM00 with
the FM1s of the POX11 on.
  
  8246   Wed Mar 6 21:58:39 2013 JenneUpdateElectronicsPOX whitening was fine all alongAfter my investigations this afternoon
(with help from Sendhil and Shivaraj), 
  
  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 
  8244   Wed Mar 6 18:51:07 2013 AnnalisaUpdateAlignmentAuxiliary laser installed for FSR and TMS measurement of the PRCWe want to measure the g-factor of the
PRC using the beat note of the main laser
with an auxiliary NPRO laser.
 IMG_3-6-13.JPG 
  8243   Wed Mar 6 18:27:24 2013 JamieUpdateGeneralnow recording input TT channels to frames, but why no autoburt?I spent some time trying to figure out
how to get a record of the pointing of the
input pointing tip-tilt (TT) channels.
  
  8242   Wed Mar 6 18:14:33 2013 ManasaSummaryLSCCalibration of BS, ITMX and ITMY actuators[Yuta, Manasa]

Measured
 MICHerrCalibration.pngMICHerrCalibration.pngMICHOLTF.pngactcalibITMBS.png 
  8241   Wed Mar 6 16:14:27 2013 SteveUpdateSAFETYsafety trainingChloe Ling, Max Horton and Annalisa Allocca
have received basic 40m specific safety training.
 IMG_500.jpg 
  8240   Wed Mar 6 11:33:09 2013 steveUpdateSAFETYsafety audit 2013 
         
           
 IMG_0010.JPG 
  8239   Wed Mar 6 09:44:29 2013 KojiUpdateLSCPRMI locking for g-factor measurement- What about normalizing POPDC to indicate
the carrier recycling gain?
- When you align the PMC, confirm
  
  8238   Wed Mar 6 08:40:03 2013 SteveUpdateVACfirst scan of this pumpdown Pumpdown 75 - Maglev - day 12
Precondition: 66 days at atm, installed
TIP-TILTs with coils that  replaced
 pd75m12d.pngpd75mRGA12d.png 
  8237   Wed Mar 6 02:46:20 2013 ManasaUpdateLSCPRMI locking for g-factor measurement [Yuta, Manasa]
PRMI alignment procedure for carrier
 locking has been kept the same except that
 POPDCspec_PRMIlocked.png 
  8236   Tue Mar 5 23:37:11 2013 yutaUpdateSUSPRM angular motion spectraI measured PRM angular motion spectra (in
daytime today).
PRM angular motion is 
 PRMangularmotion.png 
  8235   Tue Mar 5 23:00:08 2013 yutaUpdateLSCYarm and PRC g-factor from misalignment measurementI fitted intra-cavity power dependance
on mirror misalignment plot with parabola
to get the g-factor.
 ITMY_YAW_20130305_DC.pngPRM_PIT_20130305a_DC.pngPRM_YAW_20130305b_DC.png 
  8234   Tue Mar 5 18:36:27 2013 JenneUpdateLSCLSC whitening triggering startedMore effort at debugging the LSC whitening. 
Today I tried moving things over
to the c1tst model, which runs on the y-end
  
  8233   Tue Mar 5 17:23:06 2013 ChloeUpdate QPD Adding/Subtracting CircuitToday I finished building the adding/subtracting
circuit for the QPD and tested that the QPD
could see a laser moving across its visual
  
  8232   Tue Mar 5 17:09:30 2013 yutaUpdateSUSoplev calibration for ITMY[Manasa, Sendhil, Yuta]

We calibrated oplev for ITMY. Calibration
 ITMY_PIT.pngITMY_YAW.png 
  8231   Tue Mar 5 14:59:32 2013 SteveHowToVACdry-forepump replacedTP3 turbo pump's dry-foreline pump was
replaced.
How to do it:
 changingforepump.pngTP3wFp600.jpg 
  8230   Tue Mar 5 06:27:14 2013 yutaUpdateLSCintra-cavity power dependence on mirror misalignmentI measured intra-cavity power dependance
on mirror misalignment.
Intra-cavity
 PRM_PIT_20130305a.pngPRM_YAW_20130305b.pngITMX_YAW_20130305.pngITMY_YAW_20130305.png 
  8229   Tue Mar 5 01:43:04 2013 JenneUpdateASSArm A2L measurement script finishedIn either .../scripts/XARM or ...../scripts/YARM
run either A2L_XARM or A2L_YARM.
The wrapper script will, like the
 YARMdecenter.png 
  8228   Tue Mar 5 00:24:52 2013 ManasaConfiguration40m UpgradingEndtable upgrade for auxiliary green laser : customized mount Drawing of customized mount for endtable
doubler crystal (PV40+PVP2+NP9071) modified
and updated on the endtable upgrade wiki
  
  8227   Mon Mar 4 21:05:49 2013 Max HortonUpdateSummary PagesMultiprocessing and CrontabMultiprocessing:  In its current
form, the code uses multiprocessing to the
maximal extent possible.  It takes roughly
  
  8226   Mon Mar 4 20:03:42 2013 AnnalisaHowToCOMSOL TipsStudy of mirror mount eigenfrequencies I studied the eigenfrequencies of
a mirror mount designed with COMSOL.
I imposed fixed constraints for the
 MirrorSupport1.pngMirrorSupportEig1.pngpedestal.pngBase2.png 
  8225   Mon Mar 4 19:52:03 2013 Jamie, YutaUpdateGeneralinput pointing mirror (TT1/TT2) control improvedWe improved the active tip-tilt (TT) controllers
such that they now have filter banks at the
PIT/YAW inputs, and at the coil outputs:
 TT.png 
  8224   Mon Mar 4 19:38:21 2013 CharlesUpdateGeneralIntensity Stabilization and Control Systems I have been studying Jamies master's
thesis concerning intensity stabilization
of a solid-state laser (the 1064 nm specifically)
  
  8223   Mon Mar 4 18:11:10 2013 JamieUpdateSUSCleaning up suspension POS inputsI did a little bit of cleanup of the suspension
POS inputs today, both in model and MEDM
land.
 SUS_ETMX_POS.png 
  8222   Mon Mar 4 17:32:26 2013 yutaBureaucracyGeneralflowchart for PRMI g-factor measurementI made a very useful flowchart for the
week. Our goal for the week is to measure
g-factor of PRC in PRMI.
 PRMIgfactorPlan.png 
  8221   Mon Mar 4 16:46:31 2013 yutaUpdateSUSoplev calibration for PRM[Manasa, Sendhil, Yuta]

We calibrated oplev for PRM. Calibration
 PRM_PIT.pngPRM_YAW.png 
  8220   Mon Mar 4 16:26:45 2013 BrettUpdateSUSGlobal Damping Noise MeasurementHere is an amplitude spectrum plot of y-arm
cavity noise with a 50 Hz cutoff damping
filter of the form zpk(0,[50;50],1). The
 YARM_Noise.png 
  8219   Mon Mar 4 11:30:47 2013 SteveUpdatePEMair cond problem 
 The air cond is out of order
at the area covered by racks 1 X 1 
 40dAC.png 
  8218   Mon Mar 4 10:41:18 2013 Max HortonUpdateSummary PagesMultiprocessing ImplementationUpdate:
Upon investigation, the other methods
besides process_data() take almost no time
  
  8217   Mon Mar 4 09:55:33 2013 ranaUpdateLSCLSC whitening triggering started  How about posting a logic flow
diagram? Is the idea to trigger only on the
power signals to determine the lock state?
  
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