patrick.thomas@LIGO.ORG - posted 16:36, Friday 13 January 2017 - last comment - 18:25, Friday 13 January 2017(33242)
Ops Day Shift Summary
TITLE: 01/14 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC STATE of H1: Observing at 54.8268Mpc INCOMING OPERATOR: Nutsinee SHIFT SUMMARY: Ran initial alignment after losing lock. Stopped at DC readout transition while Jim damped 4735.09 Hz violin mode. Sheila increased the ISS diffracted power and I accepted the SDF differences (see attached). Sheila and Jenne took time at NLN to investigate the loss in range. LOG: 16:42 UTC Chris to end Y to remove snow with John Deere tractor 16:49 UTC Bubba to end X to remove snow with front end loader 16:52 UTC Turned off sensor correction at end X 17:23 UTC Jim and Carlos to end X to check power supply for network switch 17:34 UTC Jim turning off another degree of sensor correction at end X, dropped to commissioning 17:36 UTC Jim accepted SDF difference, set back to observing 17:40 UTC Krishna changed filter that kicked us out of observing, set back 17:41 UTC Set back to observing 18:00 UTC Jim and Carlos back 18:11 UTC Lockloss. HAM6 ISI trip. Spike to ~ .1 um/s in end Y 0.03 - 0.1 Hz seismic band 18:15 UTC Jason to LVEA to increase SR3 laser power 18:19 UTC Karen driving to warehouse 18:24 UTC Starting initial alignment. ALS X is ~ .7 18:26 UTC Jason done 18:59 UTC Kyle to mid Y to turn on diaphragm pump for CP4 sensing line 19:08 UTC Turned off sensor correction at end Y 19:09 UTC Jim and Carlos to end Y 19:18 UTC Gerardo to mid Y 19:29 UTC Chris back from end Y 19:35 UTC Kyle back 19:40 UTC Jim and Carlos back 19:43 UTC Initial alignment done. Had some trouble locked SRC. 19:48 UTC Bubba done snow removal 19:49 UTC Sensor correction turned back on at both end X and end Y 20:01 UTC Stopped at CHECK_IR. Sheila adjusted ISS diffracted power from 1 to 4 percent following procedure in alog 31262 20:10 UTC Gerardo back 20:27 UTC Stopping at DC_READOUT_TRANSITION per Sheila's request. Jim damping 4735.09 Hz violin mode using procedure in alog 32081. Set H1SUS-ETMY_L2_DAMP_MODE10 gain to .1 20:52 UTC NLN. Set 4735.09 Hz damping gain back to .1, guardian must have reset it? 20:57 UTC Sheila starting investigation in low range 20:59 UTC Accepted SDF differences for ISS diffraction change 21:05 UTC Setting observation mode to corrective maintenance for Sheila's investigation 21:57 UTC Batteries in UPS for portable atomic clock died 22:30 UTC Filiberto and interns to mid Y to look for equipment 23:36 UTC Damped PI mode 28 23:41 UTC Gerardo to mid Y to retrieve power supply 23:43 UTC Filiberto back 23:50 UTC Sheila and Jenne done investigation. Set to observing. 00:28 UTC Lock loss after steadily falling range.
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No flashes for DMRI or PRMI (later Sheila told me this is because she moved optics). 00:59 UTC Starting initial alignment. MC not locking. FSS is oscillating. Set to down a couple of times. Fixed. Struggled locking ALS X arm. Can not get the COMM beatnote above 6 by adjusting PR3. SRC locked, was converging then unlocked. Set ALIGN_IFO to down. Misaligned SRM. Moved SR2 to center pointing on ASC_AS_C. Realigned SRM. SRC locked. 02:00 UTC Initial alignment done. ** Note that this is the second time PR3 has needed to be moved a large amount to bring back the COMM beat note. ** On the way to NLN.
Summary of locking issues: 4735.09 Hz violin mode needed to be damped. Jim W. did this. Ran initial alignment twice. Each time I had to move PR3 a large amount to bring back the COMM beat note. The second time I could not bring it above 6. During both initial alignments I has trouble locking SRY. Sheila showed me a trick: Bring IFO_ALIGN to down. Misalign SRM. Open Sitemap -> LSC -> Photo Detectors Overview. Click on AS_C (box to the furthest right in red circle). Move SR2 to center beam spot in the X,Y plot on the right. Realign SRM. Take IFO_ALIGN back to SRC_ALIGN. The ISS diffracted power was low. Sheila fixed this (see summary).