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ID Date Author Type Category Subject Text   5639   Sun Oct 9 17:13:46 2011 kiwamu Update LSC First attempt to estimate mode matching efficiency using interferometer The efficiency of the mode matching (MM) to PRC (Power-Recycling      5640   Mon Oct 10 00:01:26 2011 Koji Update LSC First attempt to estimate mode matching efficiency using interferometer "^2"s are missing in the second equation, but the calculation results seem correct.      5641   Mon Oct 10 10:14:43 2011 rana Update LSC length fluctuations in SRCL  How does it make sense that the motion at 0.1 Hz of PRC is 10x larger than MICH?      5642   Mon Oct 10 12:14:00 2011 Mirko Update Computer Scripts / Programs IMC simulations [Mirko, Kiwamu] I tried to answer two questions regarding the IMC:      5643   Mon Oct 10 13:52:04 2011 kiwamu Update LSC RE: First attempt to estimate mode matching efficiency using interferometer                                5644   Mon Oct 10 15:41:56 2011 Koji Update PSL PMC aligned [Koji Suresh] The steering mirrors for PMC were aligned. The transmission went up from 0.779      5645   Mon Oct 10 16:32:18 2011 steve Update SUS UL sensor of ETMY is recovered  I lost UL osem voltage this morning when I was checking the actual connection at rack ETMY      5646   Mon Oct 10 18:53:04 2011 Katrin Update Green Locking Mirrors whose angle of incidence is not 45° The angle of incidence of light is for some mirrors on the YARM end table different from 45° even though the mirrors are      5647   Tue Oct 11 00:59:55 2011 Suresh Update IOO Preliminary locking of WFS loops [Kiwamu, Koji, Suresh] After correcting several errors in the WFS loops, we turned them on today and  6x    5648   Tue Oct 11 03:35:16 2011 kiwamu Update LSC BS actuator reponse at low frequency : measured The response of the BS actuator in a low frequency regime      5649   Tue Oct 11 15:14:50 2011 rana Update LSC BS actuator reponse at low frequency : measured                                5650   Tue Oct 11 15:19:17 2011 rana HowTo Environment 40m map The Kinemetrics dudes are      5651   Tue Oct 11 17:32:05 2011 jamie HowTo Environment 40m google maps link Here's another useful link: http://maps.google.com/maps?q=34.13928,-118.123756      5652   Tue Oct 11 19:11:25 2011 kiwamu Update LSC Re: BS actuator reponse at low frequency : measured I think the precision due to the loop gain uncertainty      5653   Tue Oct 11 21:23:51 2011 Jenne Update LSC Arm absl lengths                                5654   Wed Oct 12 00:35:42 2011 kiwamu Update LSC TRY path realigned The TRY (TRansmitted light from Y arm ) path was a bit realigned because there had been      5655   Wed Oct 12 08:43:30 2011 steve Update SUS ITMX oplev improved a bit  Atm2 is before optical path adjustment. The idea was to remove possible clipping in vacuum.      5656   Wed Oct 12 17:53:01 2011 kiwamu Update LSC BS actuator response : fitting done and histroy of delays An update on calibration of the BS actuator : A fitting has been done.      5657   Wed Oct 12 18:54:02 2011 Katrin Update Green Locking 60 Hz oscillation due to broken BNC cable There was a 60 Hz and 120 Hz oscillation on the green PDH photo diode output. After a long search, I could identify that      5658   Wed Oct 12 19:58:32 2011 Katrin Update Green Locking Power splitter is unbalanced The mini circuit power splitter ZFRSC-42S+ used at the YARM has no balanced output as it should have according to the data sheet.      5659   Thu Oct 13 03:22:53 2011 kiwamu Update LSC measurement of sensing matrix : just began - status update on LSC activity : The measurement of the LSC sensing matrix has      5660   Thu Oct 13 14:23:09 2011 steve Update SUS ITMX oplev with 3 mm beam on qpd  I replaced the JDSU-Uniphase 1125P by 1103P He/Ne laser. This new laser had 2.8 mW output yesterday. It degraded to 0.5      5661   Thu Oct 13 20:25:32 2011 Katrin Update Green Locking LPF transfer function YARM It is a 4th order filter with cut of frequency of 120 kHz.        5662   Thu Oct 13 21:40:59 2011 rana Summary VAC Recovery from the power shutdown is completed  As it turns out Steve is not crazy in this particular instance: the vacuum computer, linux3 , has some issues. I can login just      5663   Thu Oct 13 21:44:48 2011 Mirko Update CDS Seismic BLRMS channels, new RMS calculation [Rana, Koji, Mirko] We looked into the CDS RMS block c-code      5664   Thu Oct 13 23:58:38 2011 Koji Update LSC fixing REFL165 I already have reported in this entry that REFL165 shows too high DC output which does not depend on the light      5665   Fri Oct 14 04:35:45 2011 kiwamu Update LSC locking tonight The lock of DRMI wasn't stable enough to measure the sensing matrix. Failed.       5666   Fri Oct 14 16:20:11 2011 Zach Update SUS C1:SUS-ETMX_SPDMon fixed I offered to help Kiwamu with some of the 40m work. The first task was to figure out why the ETMX side OSEM monitor was so low,      5667   Fri Oct 14 18:38:41 2011 kiwamu Update SUS C1:SUS-ETMX_SPDMon fixed                                5668   Sat Oct 15 04:53:41 2011 Suresh Update IOO MC WFS Output Matrix determination After we had a rough idea of what the output matrix looks like (see this elog),      5669   Sat Oct 15 10:58:32 2011 rana Update IOO MC WFS Output Matrix determination In order to save time and sanity, you should not measure the pitch ->yaw and yaw-> pitch. It makes things too complicated      5670   Sat Oct 15 16:01:26 2011 kiwamu Update IOO about LOCKIN module                                5671   Sat Oct 15 16:42:08 2011 Koji Update LSC Testing REFL165  Test results of new REFL165 (the first attachment) - The resonant freq 166.2MHz,       5672   Sat Oct 15 17:06:20 2011 Koji Update LSC Installation REFL165 REFL165 was installed on the AP table last night. Meanwhile I found the DC power level      5673   Sun Oct 16 02:30:00 2011 rana Update Electronics Testing REFL165 Unless the bias feedback circuit has been tuned for the 1 mm diode, its possible that you are seeing some C(V) effects. Its easy      5674   Sun Oct 16 05:35:18 2011 rana Update Computer Scripts / Programs Failing to set SUS summary screen values                                5675   Mon Oct 17 07:57:24 2011 steve Update SUS ETMX sus damping restored        5676   Mon Oct 17 10:43:14 2011 Mirko Update CDS Commited changes to c1rfm I want to make changes to c1rfm. Found uncommited changes to it from Sept 27. Since we recompiled it since then it should be      5677   Mon Oct 17 11:06:31 2011 Mirko Update CDS Piping data from c1lsc to c1oaf Changed, recompiled, installed and restarted c1rfm and c1oaf to get the MC1-3 Pitch and Yaw data into the c1oaf model.      5678   Mon Oct 17 11:40:44 2011 Koji Update LSC REFL165 removed from the table REFL165 removed from the table for the C(V) test      5679   Mon Oct 17 14:26:22 2011 Mirko Update CDS Seismic BLRMS channels, new RMS calculation                                5680   Mon Oct 17 17:07:30 2011 steve Update SUS ETMX oplev returning beam od 3 mm  ETMX oplev had 6 mm diameter beam on the qpd.  I relayed the beam path with 2 lenses  to get back  3 mm      5681   Mon Oct 17 22:20:42 2011 Koji Update LSC REFL165 removed from the table                                5682   Mon Oct 17 23:28:32 2011 rana Update Electronics StochMon To get to the bottom of the RFAM mystery, we've got to resurrect the StochMon to trend the RFAM after the IMC.      5683   Mon Oct 17 23:56:34 2011 Suresh Update IOO MC WFS Integrators switched on and WFS_MASTER screen updated [Rana, Suresh]      To see if the loops will stay locked when the Integrators      5684   Tue Oct 18 04:04:27 2011 kiwamu Update LSC measurement of sensing matrix : touchy SRM I made some attempts to measure the sensing matrix      5685   Tue Oct 18 10:04:41 2011 Koji Update LSC REFL165 removed from the table The original REFL165 had ~50MHz/A dependence on the DC photocurrent. The resistr R21, which was 2670 Ohm      5686   Tue Oct 18 15:20:03 2011 kiwamu Summary IOO RFAM plan [Suresh / Koji / Rana / Kiwamu] Last      5687   Tue Oct 18 20:50:19 2011 Suresh Update IOO C1IOO and WFS associated screens In keeping with the current protocol,  I have started to move all the user-built medm screens associated with C1IOO into the      5688   Tue Oct 18 21:19:18 2011 rana Configuration IOO WFS disabled in SUS I found that the MC WFS had large offset control signals going to the MC SUS. Even though the input switch was off, the integrators

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