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New entries since:Wed Dec 31 16:00:00 1969
ID Date Authorup Type Category Subject Text Attachments
  8122   Wed Feb 20 20:58:37 2013 yutaUpdateAlignmentclipping centering checklistBlue
ones are the ones we checked yesterday.
Green
 ClippingCenteringChecklist.pdf 
  8124   Wed Feb 20 21:56:08 2013 yutaUpdateAlignmentclipping centering checklistI'm not sure about the OMC situation at
40m. I think there are no direct beam reflected
back into IFO from OMC path. There must be
  
  8129   Thu Feb 21 15:21:07 2013 yutaUpdateVACall heavy doors on, started pumping down annulus[Steve, Manasa, Jenne, Sendhil, Evan,
Yuta]
  
  8141   Sat Feb 23 00:34:28 2013 yutaUpdateComputerscrontab in op340m deleted and restored (maybe)I
accidentally overwrote crontab in op340m
with an empty file.
  
  8143   Sat Feb 23 07:14:58 2013 yutaUpdateLSCcan't lock Y armI tried to align and lock Y arm for the
first time after pumping.
But I couldn't lock Y arm for more
 TRYPOY.png 
  8146   Sat Feb 23 15:26:26 2013 yutaUpdateComputerscrontab in op340m updatedI found some daily cron jobs for op340m
I missed last night. Also, I edited timings
of hourly jobs to maintain consistency with
  
  8150   Sat Feb 23 17:14:59 2013 yutaUpdateLSCcan't lock Y armJenne found that;
  0. If all mirrors are "aligned,"
Yarm flashes.
  
  8157   Mon Feb 25 15:30:29 2013 yutaUpdateAlignmentY arm locked, both colors[Koji, Yuta]

We aligned Y arm to Y green and tweaked
  
  8162   Mon Feb 25 21:25:14 2013 yutaUpdateAlignmentboth arms locked in IR[Jenne, Evan, Yuta]

After Y alignment, X arm is aligned
 QUAD1_1045890588.png 
  8164   Mon Feb 25 22:42:32 2013 yutaSummaryAlignmentcurrent IFO situation[Jenne,Yuta]

Both arms are aligned starting from
 IPANGdrift.png 
  8177   Wed Feb 27 01:09:53 2013 yutaUpdateLockingPRMI sideband/carrier locked[Jenne,Yuta]

We succeeded in locking PRMI in sideband
 6x 
  8181   Wed Feb 27 11:22:54 2013 yutaUpdateComputersbackup crontabI made a simple script to backup crontab
(/opt/rtcds/caltech/c1/scripts/crontab/backupCrontab).
  
  8182   Wed Feb 27 11:59:43 2013 yutaUpdateSUSPRM/BS coil re-balancedI re-adjusted coil gains and f2a filters
for PRM and BS.
I'm not sure what happened to PRM
 PRM_f2a20130227.pngBS_f2a20130227.png 
  8196   Thu Feb 28 02:43:49 2013 yutaUpdateLSCsome qualitative evidence of PRMI sideband lock[Manasa, Yuta]

Since we have setup POP22 PD now(
 PRMIsideband.png 
  8197   Thu Feb 28 03:25:27 2013 yutaUpdateLSCPR gain ~ 25 from PRMI carrier lock[Manasa, Yuta]

We locked PRMI in carrier. 
 PRMIcarrier.png 
  8199   Thu Feb 28 05:54:54 2013 yutaUpdateRF Systemphase tracker: calibrationI swept the frequency of RF input to the
beatbox to calibrate and check linearity
range of phase tracker.
 ALS-BEATX_FINE_PHASE_OUT.pngALS-BEATY_FINE_PHASE_OUT.png 
  8200   Thu Feb 28 06:51:17 2013 yutaUpdateRF Systemphase tracker: noise levelI measured noise level of the phase tracker
by inputting constant frequency RF signal
from marconi.
 frequencynoise.png 
  8208   Fri Mar 1 16:58:37 2013 yutaUpdateLSCXarm oscillation stoppedPOX11 oscillation at 630 Hz was stopped
by installing 630 Hz resonant gain to LSC_XARM.
After few hours, oscillation stopped.
 POX11_630Hz.png 
  8212   Sat Mar 2 05:53:15 2013 yutaUpdateLSCstable lock of PRMII tuned alignment, gains and filters to
achieve stable lock of PRMI.
It now locks quite stably with UGF
 LSCMICHOLTF_PRMI.pngLSCPRCLOLTF_PRMI.pngPRMtoAS55REFL55.png 
  8214   Sat Mar 2 20:09:12 2013 yutaUpdateRF Systemphase tracker: DAQ noise limited[Koji, Yuta]

We found that our phase tracker noise
 frequencynoisewhitening.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 
  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 
  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 
  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 
  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 
  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 
  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 
  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 
  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
  
  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 
  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 
  8259   Fri Mar 8 15:27:42 2013 yutaUpdateGreen LockingPSL green shutter installed[Manasa, Yuta]

Mechanical shutter for PSL green is
  
  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).
  
  8283   Wed Mar 13 08:34:33 2013 yutaUpdateLockingTWO arms TWO colors- I took the shutter from AS table to use
it for the PSL green. It was sitting near
MC REFL path unused (elog
  
  16827   Tue May 3 21:05:23 2022 yutaUpdateBHDAS path alignment, removing a lot of green stuff[Tega, Yehonathan, Koji, Yuta]

We tried to align AS path this afternoon.
 7x 
  16850   Thu May 12 20:24:29 2022 yutaUpdateBHDPOX and POY investigation[Anchal, Yuta]

We checked POX and POY RF signal chains
 POY.JPG 
  16856   Mon May 16 13:22:59 2022 yutaUpdateBHDREFL and AS paths aligned at AP tableAfter Xarm and Yarm were aligned by Anchal
et al, I aligned AS and REFL path
in the AP table.
 REFLPOP.JPGPOPAS.JPG 
  16865   Thu May 19 18:56:08 2022 yutaUpdateBHDCurrent OSEM sensor values with all the suspensions alignedCurrent OSEM sensor values with all the
suspensions aligned are attached.
For 'BS','ITMX','ETMX','ITMY','ETMY','PRM','SRM','LO1','LO2',
 OSEMS.txt 
  16873   Wed May 25 16:38:27 2022 yutaUpdateSUSSuspensions quick health check[JC, Yuta]

We did a quick health check of
suspesions after the pump down.
 Screenshot_2022-05-25_16-46-13.pngOSEMcheck.JPG 
  16875   Wed May 25 17:34:47 2022 yutaConfigurationBHDIFO recovery - IFO alignmentIFO aligned to maximize flashings, except
for GRY and LO-AS.
 Screenshot_2022-05-25_17-47-57.png 
  16877   Thu May 26 19:55:43 2022 yutaConfigurationBHDOplevs centered, BHD DCPDs are now online[Paco, Yuta]

We have aligned the IFO (except
for LO-AS and GRY), and centered
 elog_1Y2.JPGelog_BHD.JPGelog_box.JPGScreenshot_2022-05-26_17-37-27_IFOaligned_OplevCentered.pngScreenshot_2022-05-26_20-35-02.png 
  16880   Fri May 27 17:45:53 2022 yutaConfigurationBHDBHD camera installed, GRY aligned[JC, Paco, Yuta]

After the IFO recovery (elog 40m/16881),
  
  16884   Wed Jun 1 11:56:28 2022 yutaUpdateALSShutter driver for GRY replaced[JC, Yuta]

We replaced a shutter driver for GRY
 Screenshot_2022-06-01_12-01-53.png 
  16886   Thu Jun 2 20:05:37 2022 yutaConfigurationPSLIMC input power recovered to 1W, some alignment works[Paco, Yuta]

We have
 Before.JPGAfter.JPG 
  16888   Fri Jun 3 15:22:51 2022 yutaUpdateLSCBoth arms locked with POY/POX, IR beam centered on TMs with ASS[JC, Paco, Yuta]

We locked both Y and X arms with POY11
 IRBeamsOnTMs.JPGScreenshot_2022-06-03_15-03-51.png 
  16889   Fri Jun 3 17:42:50 2022 yutaUpdateLSCMICH locks with AS55_QAS path at AP table as re-aligned and confirmed
that MICH can be locked with AS55 Q.
 Screenshot_2022-06-03_17-41-55.png 
  16894   Mon Jun 6 21:01:22 2022 yutaUpdateIMCMC1 OSEM sensor sign flipped, MC1/2/3 free swinging overnight for inmat diagonalization[Tomislav Andric, Rana, Yuta]

We put -1 to MC1 OSEM sensor gains
and re-tuned MC1 damping.
 Screenshot_2022-06-06_21-05-28.png 
  16896   Tue Jun 7 17:26:21 2022 yutaUpdateSUSITMY ULCOIL mystery not solved[Paco, Yuta]

We investigated the ITMY ULCOIL
issue (40m/16873).
 ULCoilInductance.JPGULCoilResistance.JPGWrongSetting.JPG 
  16898   Tue Jun 7 19:13:12 2022 yutaUpdateSUSAgreement on suspension damping loop polarity conventionsAnchal, Paco and I agreed to follow
the polarity conventions below for suspension
damping loops.
 NoteBeforeChanges.JPG 
  16903   Wed Jun 8 18:16:20 2022 yutaUpdateSUSITMY ULCOIL mystery: Coil driver swap testTo see if the ULCOIL channel of the ITMY coil driver
is working or not, I swapped ITMY coil
 Screenshot_2022-06-08_18-10-44.pngSWAP.JPG 
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