40m QIL Cryo_Lab CTN SUS_Lab CAML OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop

40m Log, Page 5 of 354  Not logged in

List |  Find |  Login |  Help

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  17691 Entries

Goto page Previous  1, 2, 3, 4, 5, 6 ... 352, 353, 354   Next

ID Date Author Type Category Subject Text   6952   Tue Jul 10 17:47:55 2012 yuta Update SUS PRM oplevs fixed I centetered PRM oplev, lowered gain and PRM oplev servo is not oscillating any more. It is OK for more than a softball      6953   Tue Jul 10 21:37:05 2012 yuta Update LSC PRMI glitch study PRMI glitch certainly comes from power recylcing gain fluctuation.      6954   Wed Jul 11 02:25:11 2012 yuta Update LSC PRMI beam spot motion might be from PRM/BS motion My hypothesis from the measurements below, to explain PRMI beam spot motion is;      6955   Wed Jul 11 03:53:41 2012 yuta Update LSC BS 3.3 Hz motion on MI It is not as dramatic as PRMI, but I could see BS 3.3 Hz motion at AS and REFL when MI is locked at dark fringe.      6960   Wed Jul 11 13:36:58 2012 yuta Update SUS OSEM and oplev spectra of optics Below is angular spectra of every suspended core optics. As you can see, there's a peak at      6964   Wed Jul 11 16:19:08 2012 yuta Update SUS oplev servo phiology I heard that Steve did great work on oplev in Feb 2012. Here's summary what happened to oplev      6965   Thu Jul 12 02:12:42 2012 yuta Update SUS BS 3.3 Hz motion I tried to reduce BS 3.3 Hz motion with local damping. 3.3 Hz probably comes from the stack, but I want to reduce this because      6967   Thu Jul 12 13:27:16 2012 yuta Update SUS measured OLTFs of PRMI optics' SUSPOS I measured openloop transfer functions of PRM/BS/ITMX/ITMY SUSPOS servo. They look great. They all have ~50      6972   Thu Jul 12 23:15:34 2012 yuta Update LSC PRMI LSC is making PRM motion worse It looks like PRMI LSC is making PRM motion (and BS motion) at ~3Hz worse.      6974   Fri Jul 13 15:49:38 2012 yuta Bureaucracy General 40m Priority Action Items These are all priority action items need to be done before I come back (in mid-September).      7994   Mon Feb 4 19:33:19 2013 yuta Summary General rough analysis of aligned PRM-PR2 mode scan [Jenne, Yuta] We redid PRM-PR2 cavity scan because      7997   Tue Feb 5 02:04:44 2013 yuta Summary General rough analysis of aligned PRM-PR2 mode scan I redid PRM-PR2 cavity scan using oscilloscope to avoid anti-aliasing effect. Measured       8000   Tue Feb 5 10:09:08 2013 yuta Summary General rough analysis of aligned PRM-PR2 mode scan stdev of [0.764, 0.751] is 0.007, but what we need is the error of the averaged number. Statistical error of the averaged number      8006   Tue Feb 5 19:32:47 2013 yuta Summary General PR2/PR3 flipping and PRC stability We are considering of flipping PR2 and/or PR3 to make PRMI stable because PR2/PR3 seems to be convex.      8012   Wed Feb 6 15:20:55 2013 yuta Summary General FWHM was wrong I have to blame Jamie for putting extra 2 randomly. Measured PRM-PR2 cavity       8021   Thu Feb 7 10:35:35 2013 yuta Update General Store optics in respective cabinets I'm not the one who opened the ITMX table yesterday, but thanks for reminding me. I put POP DC oscilloscope and its      8028   Thu Feb 7 19:25:22 2013 yuta Update CDS C1ALS filters reloaded Filters for C1ALS were all gone. So, I copied /opt/rtcds/caltech/c1/chans/C1GCV.txt and renamed it as       8034   Fri Feb 8 12:39:32 2013 yuta Update Locking PRMI work Half-PRC at this time already have two changes from the previous half-PRC; PR2 replaced/flipped and different TM before BS.      8036   Fri Feb 8 12:43:26 2013 yuta Update Computers videocapture.py now supports movie capturing I updated /opt/rtcds/caltech/c1/scripts/general/videoscripts.py so that it supports       8041   Fri Feb 8 19:29:44 2013 yuta Summary General arbcav of half PRC with flipped PR2 We need expected finesse and g-factor to compare with mode-scan measurement. Can you give us the g-factor of the half-PRC and      8049   Fri Feb 8 23:59:42 2013 yuta Update Locking PR2-flipped half-PRC mode scan I did mode scan of PR2-flipped half-PRC to see if it behaves as we expect. Measured      8052   Sun Feb 10 17:30:39 2013 yuta Update Locking PR2-flipped half-PRC mode scan I redid half-PRC mode scan by applying mislignment to PRM. Half-PRC's      8053   Sun Feb 10 18:00:13 2013 yuta Summary LSC PR2-flipped half-PRC spectra/OLTF To compare with future PRMI locking, I measured spectra of POPDC and feedback signal. I also measured openloop transfer function      8056   Mon Feb 11 13:15:16 2013 yuta Update Locking PR2-flipped half-PRC mode scan I found a mistake in my code (thanks Jamie!). I forgot to square the g-factor. I corrected the following elogs;      8064   Mon Feb 11 21:03:15 2013 yuta Update Locking PR2-flipped half-PRC mode scan To estimate the systematic effects to the g-factor measurement, I changed how to analyze the data in multiple ways.      8065   Tue Feb 12 00:14:00 2013 yuta Update Locking PRM coil balancing We tried to lock half-PRC tonight, but we couldn't. Why?? I could lock yesterday. It locks for ~ 1 sec, but it beam      8066   Tue Feb 12 00:50:08 2013 yuta Update Locking PR2 oplev spectra I wanted to see if PR2 motion makes PRC beam motion or not, using temporary oplev to PR2.      8073   Tue Feb 12 23:24:17 2013 yuta Update Alignment IFO alignment in prep for in-air PRMI [Manasa, Yuta] Lot's of alignment work,       8074   Wed Feb 13 01:26:08 2013 yuta Summary General rough analysis of aligned PRM-PR2 mode scan Koji was correct. When you estimate the variance of      8078   Wed Feb 13 19:09:32 2013 yuta Summary General possible explanations to oval REFL beam [Jenne, Manasa, Jamie, Yuta] The shape of the REFL beam reflected      8080   Wed Feb 13 19:41:07 2013 yuta Summary General possible explanations to oval REFL beam We checked that REFL beam is already oval in the vacuum. We also centered in-air optics, including lens, in the REFL path, but REFL      8082   Thu Feb 14 00:10:12 2013 yuta Summary Alignment REFL is not clipped Let's wait for astigmatism calculation. In either case(clipping or astigmatism),      8091   Fri Feb 15 20:07:28 2013 yuta Update Alignment POP path set up but AS55 is broken [Manasa, Yuta] We set up POP camera and POPDC PD,      8092   Fri Feb 15 21:22:29 2013 yuta Update Electronics AS55 replaced with POP55 PD I temporarily replaced AS55 PD with PD labeled "POP55(POY55)". I think POP55 is working because I      8093   Sat Feb 16 17:27:26 2013 yuta Update SUS PRM coil balanced PRM coil gains and f2a filters are adjusted for PRMI work. It seems like       8094   Sat Feb 16 18:32:01 2013 yuta Summary RF System phase tracker: OLTF I measured openloop transfer function of the phase tracking loop for the first characterization of phase tracker.      8095   Sat Feb 16 19:23:17 2013 yuta Update LSC PR2 flipped PRMI locked It is my pleasure to announce that the first lock of PR2 flipped PRMI was succeeded.      8099   Mon Feb 18 18:28:01 2013 yuta Bureaucracy Alignment we are going to pump down We will start preparing for pumping down. Main goal for this is to demonstrate PRFPMI using      8102   Tue Feb 19 00:21:09 2013 yuta Update Electronics POP path set up but AS55 is broken Hmm......   I thought AS55 is broken because it was not responding to the AS beam nor flashlight      8103   Tue Feb 19 02:23:40 2013 yuta Bureaucracy General action items for PRFPMI These are things need to be done for demonstrating PRFPMI using ALS. All of these should be done before      8105   Tue Feb 19 08:06:02 2013 yuta Update Electronics POP path set up but AS55 is broken I didn't use LED flash light. We learned from the past (elog #7355). I checked that POP55 and REFL55/165/33/11      8112   Tue Feb 19 19:55:52 2013 yuta Update IOO MC yaw input tuned [Jenne, Manasa, Yuta] Since we levelled IMC stack, we had      8114   Wed Feb 20 03:13:10 2013 yuta Update Alignment clipping centering checklist I attached clipping/centering checklist for the alignment. Blue      8115   Wed Feb 20 10:13:41 2013 yuta Update Alignment PRC flashing brighter than last week After in-vac alignment work last night, PRC is flashing brighter than PRMI alignment last week.      8119   Wed Feb 20 19:48:16 2013 yuta Update Alignment BS table oplev re-arranged [Sendhil, Yuta] After aligning IFO and putting the      8121   Wed Feb 20 20:15:29 2013 yuta Update Alignment SRM oplev status Currently, SRM is misaligned in pitch so that SRM reflected beam hits on the top edge of SR3 (not on the mirror, but on the cage      8122   Wed Feb 20 20:58:37 2013 yuta Update Alignment clipping centering checklist Blue ones are the ones we checked yesterday. Green      8124   Wed Feb 20 21:56:08 2013 yuta Update Alignment clipping centering checklist I'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 yuta Update VAC all heavy doors on, started pumping down annulus [Steve, Manasa, Jenne, Sendhil, Evan, Yuta]      8141   Sat Feb 23 00:34:28 2013 yuta Update Computers crontab in op340m deleted and restored (maybe) I accidentally overwrote crontab in op340m with an empty file.

Goto page Previous  1, 2, 3, 4, 5, 6 ... 352, 353, 354   Next

ELOG V3.1.3-