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Full | Summary | Threaded     -- All entries -- Last day Last 3 Days Last week Last month Last 3 Months Last 6 Months Last Year -- Type -- Configuration Update Summary HowTo Bureaucracy Omnistructure Metaphysics Frogs  17696 Entries

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ID Date Author Type Category Subject Text   11696   Sat Oct 17 18:55:07 2015 rana Update LSC DRFPMI Locked for 20 sec  in addition to Koji's words I feel like we should      11698   Mon Oct 19 15:23:22 2015 ericq Update LSC Longer DRFPMI lock Here is a longer lock, about 100 seconds RF only, from later that same night. The in-loop CARM and DARM error signals have      11700   Mon Oct 19 16:20:52 2015 ericq Update LSC Green beatnote couplers installed Last Friday, I installed some RF couplers on the green BBPDs' outputs, and sent them over to Gautam's frequency divider      11701   Tue Oct 20 11:24:29 2015 ericq HowTo LSC How to DRFPMI Herein, I will describe the current settings and procedures used      11708   Fri Oct 23 09:55:50 2015 Steve Update LSC stable days        11714   Mon Oct 26 18:59:25 2015 gautam Update LSC Green beatnote couplers installed I found (an old) 10 dB coupler in the RF component shelves near MC2 - it has BNC connectors      11718   Tue Oct 27 03:56:52 2015 ericq Update LSC DRFPMI work A handful of DRFPMI locks tonight, longest one was ~7 minutes.  EPICS/network latency has been      11722   Thu Oct 29 03:25:49 2015 ericq Update LSC DRFPMI work [ericq, Gautam] The length of DRFPMI lock did not increase much tonight, but we got a ~80 second sensing      11726   Tue Nov 3 03:12:46 2015 ericq Update LSC DRFPMI work Tonight was kind of a wash.  We spent some time retaking single arm scans with Gautam's frequency      11735   Thu Nov 5 02:18:32 2015 gautam Update LSC FSR and linewidth measurements with phase tracker While the ETMx issues are being investigated - with Eric's help, I took some data from arm scans of the Y arm through      11738   Fri Nov 6 15:56:00 2015 gautam Update LSC FSR and linewidth measurements with phase tracker Summary: I performed a preliminary calibration of the X and Y phase trackers, and found      11740   Mon Nov 9 11:34:51 2015 yutaro Update LSC FSR and linewidth measurements with phase tracker I fitted the data obtained with the FSR and linewidth measurements and I've got FSR and finesse of y-arm by fitting.      11741   Mon Nov 9 14:24:36 2015 yutaro Update LSC FSR and linewidth measurements with phase tracker I'd like to add a few calculation results, mode matching ratio for Y arm and modulation depth.      11742   Mon Nov 9 15:59:06 2015 ericq Update LSC FSR and linewidth measurements with phase tracker      11743   Mon Nov 9 16:58:59 2015 gautam Update LSC FSR and linewidth measurements with phase tracker      11745   Tue Nov 10 02:34:28 2015 gautam Update LSC Updated interpretation of peaks After thinking about the interpretation of the various peaks seen in the scan through 2 FSRs, I have revised the information presented      11746   Tue Nov 10 11:06:02 2015 yutaro Update LSC Updated interpretation of peaks      11747   Tue Nov 10 11:40:03 2015 Koji Update LSC Updated interpretation of peaks What is the uncertainty of your RoC estimation? One measurement of the ETMY ROC was 57.6m, but we trust another measured      11748   Tue Nov 10 11:41:56 2015 Koji Update LSC Updated interpretation of peaks FYI: I've also reported the similar mod depths of 11M: 0.194      11749   Tue Nov 10 16:34:00 2015 yutaro Update LSC Updated interpretation of peaks      11761   Fri Nov 13 15:48:16 2015 gautam Update LSC Phase tracker calibration using Rubidium standard [yutaro, gautam]  6x    11762   Fri Nov 13 17:33:39 2015 gautam Update LSC g-factor measurements      11800   Mon Nov 23 20:32:43 2015 Koji Update LSC Frequency source fixed, IMC LO level adjusted The frequency source was fixed. The IMC LO level was adjusted. IMC is locked => OLTF measured      11801   Mon Nov 23 21:48:49 2015 Koji Update LSC Frequency source fixed, IMC LO level adjusted The trouble we had: the 29.5 MHz source had an output of 6 dBm instead of 13 dBm.      11803   Mon Nov 23 23:42:56 2015 ericq Update LSC ALSY recovered [ericq, gautam] Gautam couldn't observe a Y green beatnote earlier, so we checked      11804   Tue Nov 24 01:14:23 2015 Koji Update LSC ALSY recovered Sorry, I completely forgot to turn the Marconi on...      11806   Tue Nov 24 14:58:40 2015 yutaro Update LSC ITMX misaligned I misaligned ITMX. The oplev servo for ITMX is now turned off. You can restore ITMX alignment by running "restore".      11810   Wed Nov 25 16:40:32 2015 yutaro Update LSC round trip loss of Y arm I measured round trip loss of Y arm. The alignment of relevant mirrors was set ideal with dithering (no offset).      11813   Wed Nov 25 22:37:12 2015 yutaro Update LSC removal of Gautam's cable in 1Y2 and restoration of POYDC [yutaro, Koji] We disconnected the cable that was connected to CH5 of the whitening filter in      11814   Wed Nov 25 22:59:42 2015 yutaro Update LSC AS table optics realignment I slightly changed the orientation of a few mirrors on AS table that are used to make the AS light get into PDs,      11815   Wed Nov 25 23:17:34 2015 yutaro Update LSC strange behavior of ASDC [yutaro, Koji] I noticed that ASDC level changes depending on the angle of ITMY when trying      11816   Wed Nov 25 23:34:52 2015 yutaro Update LSC round trip loss of Y arm [yutaro, Koji] Due to the strange behavior (elog      11817   Thu Nov 26 19:39:27 2015 Koji Update LSC Current state of the frequency source, and possible improvement Uploaded on T1000461 too.      11818   Fri Nov 27 03:38:23 2015 yutaro Summary LSC round trip loss of Y arm Tonight I measured "loss map" of ETMY. The method to calculate round trip loss is same as written in elog      11819   Fri Nov 27 22:20:24 2015 yutaro Update LSC round trip loss of Y arm Here, I upload data I took last night, including the power of reflected power (locked/misaligned) and transmitted power for each point (attachement      11820   Sat Nov 28 11:46:40 2015 yutaro Update LSC possible error source of loss map measurement I found that TRY level degraded and the beam shape seen with CCD camera at AS port was splitted when the beam spot on ETMY was      11821   Sun Nov 29 05:23:57 2015 rana Update LSC Current state of the frequency source, and possible improvement I need some more hints to understand the improvement, although its generally good to re-build it considering the sad state      11822   Sun Nov 29 12:32:26 2015 Koji Update LSC Current state of the frequency source, and possible improvement I'm not claiming we need to modify the frequency source immediately as we are not limited by the oscillator amplitude or      11823   Mon Nov 30 10:41:45 2015 yutaro Update LSC Does a baffle in front of ETMY have effect on loss map measurement? It might have, so I think I need to estimate shift of beam spot more preciely.      11825   Mon Nov 30 14:12:14 2015 ericq Update LSC LO level check for the LSC RF distribution box I checked the RF levels at the LSC LO distribution box, with the agilent scope and a handful of couplers. This was all done with the Marconi      11826   Mon Nov 30 15:17:57 2015 Koji Update LSC LO level check for the LSC RF distribution box T1000461 tells us that the nominal LO input is 2dBm although we don't know what's the      11827   Mon Nov 30 16:33:06 2015 ericq Update LSC strange behavior of ASDC One possible explanation of this behavior is simply poor centering of the AS beam on AS55 (whose DC level provides ASDC, if      11828   Mon Nov 30 17:17:30 2015 yutaro Update LSC Does a baffle in front of ETMY have effect on loss map measurement? With captured images of ETMYF, I measured the shift of the beam spot on ETMY. The conclusions are:      11829   Mon Nov 30 18:27:30 2015 Koji Update LSC strange behavior of ASDC It wasn't fully mentioned in ELOG 11814. We checked the PD first and this behavior      11836   Wed Dec 2 03:34:30 2015 ericq Update LSC SRCL OLG weirdness [gautam, ericq] Since ETMX seems to have been on good behavior lately, we tried to fire the      11838   Wed Dec 2 15:52:28 2015 yutaro Update LSC restoration of POXDC I disconnected the      11839   Wed Dec 2 17:14:33 2015 yutaro Update LSC Beam on POX11 is possibly not centered well I checked how POXDC level changes when the angle of ITMX is varied. ETMX was misaligned. Then I found that in YAW direction      11841   Thu Dec 3 03:01:07 2015 gautam Update LSC Calibration of C1CAL [ericq, gautam] While trying to resolve the strange SRCL loop shape seen yesterday (which has      11845   Thu Dec 3 19:10:28 2015 yutaro Update LSC XARM lock with ITMX actuated and related change on ASS To avoid the strange kicking of ETMX, I locked XARM with ITMX actuated instead of ETMX so that I changed elements of C1LSC_OUTPUT_MTRX;      11847   Fri Dec 4 12:33:52 2015 yutaro Update LSC Beam on POX11 is possibly not centered well To focus POX beam on POX11 PD, I added an iris and a lens before POX11 PD as you can see in Attachment 1.

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