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

40m Log, Page 217 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 ... 216, 217, 218 ... 352, 353, 354   Next

ID Date Author Type Category Subject Text   9688   Mon Mar 3 23:16:06 2014 rana Update LSC Y Arm Loop Shape found to be weird: changed now  I was getting the Y Arm ready for Eric Q's loss measurements and so I looked at the noise and loop shape. The loop shape      9691   Wed Mar 5 11:33:10 2014 Koji Summary LSC 2 arm ALS->LSC transition - road map Step by step description of transition from 2arm ALS to Common/Differential LSC for FPMI      9692   Wed Mar 5 16:27:51 2014 ericq Update LSC Preliminary Arm Loss Measurements I measured the arm cavity losses as Kiwamu did way back in ELOG 5074.      9693   Wed Mar 5 18:04:36 2014 ericq Update LSC Equivalent Displacement Noise from QPD Dark Noise in SQRTINV At today's meeting, it was suspected that these noise levels were far too low. (ELOG      9694   Wed Mar 5 19:15:39 2014 Jenne Summary LSC ALS offset moving script modified                                9696   Wed Mar 5 22:32:21 2014 manasa Update LSC Stuck at step 2                                9698   Thu Mar 6 11:15:32 2014 Koji Summary LSC Stuck at step 2 You don't need to make transition from ALS X/Y to ALS C/D. Just stabilize the arms with ALS C/D from the beginning.      9702   Fri Mar 7 00:43:34 2014 manasa Update LSC ALS C&D locked (on MC2 and ETMs) and IR resonance obtained [EricQ, Manasa]      9708   Mon Mar 10 21:12:30 2014 Koji Summary LSC Composite Error Signal for ARms (1) The ALS error (i.e. phase tracker output) is linear everywhere, but noisy.  The 1/sqrt(TR) is linear and less      9709   Mon Mar 10 21:13:43 2014 nicolas Summary LSC Composite Error Signal for ARms (2) In order to better understand how the composite signal would behave in the presence of noise, I decided to do a simple analysis of the      9710   Mon Mar 10 21:14:58 2014 ericq Summary LSC Composite Error Signal for ARms (3) Using Koji's mathematica notebook, and Nic's python work, I set out to run a time domain simulation of the error signal, with      9711   Mon Mar 10 21:16:13 2014 Koji Summary LSC Composite Error Signal for ARms (4) The LSC model was modified for CESAR. A block called ALSX_COMBINE was made in the LSC block. This block receives the      9712   Mon Mar 10 21:16:56 2014 Koji Summary LSC Composite Error Signal for ARms (5) After making the CDS modification, CESAR was tested with ALS. First of all, we run CESAR with threshold      9713   Tue Mar 11 14:49:01 2014 Koji Summary LSC Important notice on the XARM servo The nominal gain of the XARM for the POX11 error signal is      9715   Tue Mar 11 15:14:34 2014 den Summary LSC Composite Error Signal for ARms (1)                                9717   Tue Mar 11 15:21:08 2014 Koji Summary LSC Composite Error Signal for ARms (1) True. But we first want to realize this for a single arm, then move onto the two arms case.       9718   Tue Mar 11 18:33:21 2014 Koji Update LSC Composite Error Signal for ARms (6) Today we modified the CESAR block. - Now the sign(X) function is in a block.      9719   Tue Mar 11 18:34:11 2014 Jenne Update LSC Composite Error Signal for ARms (7) [Nic, Jenne, EricQ, and Koji] We have used CESAR successfully to bring the      9724   Thu Mar 13 01:18:00 2014 Jenne Update LSC Composite Error Signal for ARms (8) [Jenne, EricQ] As Koji suggested in his email this afternoon, we looked at how much actuator  7x    9726   Fri Mar 14 09:44:34 2014 Steve Update LSC morning lock        9728   Fri Mar 14 12:18:55 2014 Koji Update LSC Composite Error Signal for ARms (9) Asymptotic cooling of the mirror motion with CESAR was tested. With ALS and the full control bandwidth      9740   Wed Mar 19 21:37:45 2014 manasa Summary LSC Attempt to lock PRMIsb with REFL165I&Q I tried to repeat Koji's PRMI lock using REFL165I/Q. I was not able to lock PRMI stably. All I      9742   Fri Mar 21 01:54:32 2014 ericq Update LSC Some early CARM modeling  I've been getting a simulation going with the eventual goal of simulating CESAR-type signals for CARM. So for I've only been using  7x    9744   Sun Mar 23 14:20:07 2014 rana HowTo LSC BLRMS screens  We should make screens like this for the LSC signals, errors, ALS, etc.      9751   Wed Mar 26 11:16:59 2014 ericq Summary LSC Composite Error Signal for ARms (3) Extending the previous model, I've closed a rudimentary CESAR loop in simulink. Error signals with varying noise levels are combined      9753   Wed Mar 26 14:54:32 2014 Koji Summary LSC PRMIsb locked with REFL165I&Q again [Manasa, Eric, Koji] PRMIsb was locked with REFL165I&Q.      9754   Wed Mar 26 21:51:42 2014 ericq Summary LSC PRMIsb locked with REFL165I&Q again Incidentally, while messing around with transfer functions and sensing matrix elements this evening, I was able to sideband lock      9758   Fri Mar 28 17:22:55 2014 Koji Summary LSC PRMIsb locked with REFL165I&Q again While I'm looking at the PRM ASC servo model, I tried to use the current servo filters for the ASC       9765   Mon Mar 31 13:15:55 2014 manasa Summary LSC Alignment update                                9766   Mon Mar 31 13:26:23 2014 manasa Update LSC LSC model modified I have included Yarm CESAR to the LSC model. It was just a copy paste of the Xarm CESAR. Since we are now meditating about implementing      9767   Mon Mar 31 17:47:57 2014 ericq Summary LSC MICH sensing oddities in REFL 3F Last week, while I had the PRMI locked on REFL33, I did some poking around with mirror excitation to RFPD quadrature transfer      9768   Mon Mar 31 21:23:30 2014 Gabriele Summary LSC MICH sensing oddities in REFL 3F                                9772   Tue Apr 1 21:45:01 2014 Jenne Summary LSC PRM violin notch not at correct freq? Koji and I have the PRMI locked right now, and we hear a very strong violin mode ringing up, at 628Hz.  This is, according to      9774   Wed Apr 2 01:18:30 2014 Jenne Update LSC Attempt at PRMI+2 arms I was trying to lock PRMI+2 arms, but I'm losing patience with the MC losing lock.  It's mostly well-behaved, but every now and      9780   Thu Apr 3 00:30:52 2014 Jenne Update LSC Attempt at PRMI+2 arms [EricQ, Jenne] We started out this evening by locking the PRMI, on different REFL PDs,      9781   Thu Apr 3 03:06:34 2014 Jenne Update LSC Attempt at PRMI+2 arms [EricQ, Jenne] Much more success later!  We've had the arms locked on ALS      9783   Thu Apr 3 18:09:54 2014 ericq Update LSC Attempt at PRMI+2 arms So, here's the basic: "We reduced the CARM offset and saw more TRY" plot.       9784   Thu Apr 3 18:55:10 2014 ericq Summary LSC Some CARM related modeling  The other day, Jenne and I were comparing my MIST simulation to her Optickle simulation for the CARM transfer functions I posted      9785   Fri Apr 4 18:51:29 2014 ericq Summary LSC MORE CARM related modeling In today's ISC call, Kiwamu was comparing two ways to approach resonance:      "C-Type": The  9x    9787   Tue Apr 8 01:58:53 2014 Jenne Update LSC Playing with PRMI + 2 arms I played around with the PRMI + 2 arms situation again this evening.  (I'm not ready to call it "PRFPMI" until      9788   Tue Apr 8 10:44:53 2014 Koji Update LSC Playing with PRMI + 2 arms I vaguely remember that the ALS count (Phase Tracker output) is converted to Hz@532nm by a factor  ~20kHz/cnt.      9789   Tue Apr 8 19:10:39 2014 rana Update LSC arm length measurements  Since we don't have an arm length precision measurement (i.e. better than centimeters), why not just do as Koji suggests and use      9790   Tue Apr 8 23:04:14 2014 manasa Update LSC arm length measurements                                9791   Wed Apr 9 02:34:20 2014 Jenne Update LSC Jumping over the CARM resonance point Koji was right, and I was using much too large of a CARM offset.       9792   Wed Apr 9 16:08:33 2014 Jenne Update LSC CARM loop gains vs. CARM offset I have taken EricQ's simulation results for the CARM plant change vs.  CARM offset, and put that together with the CM and CARM  8x    9793   Thu Apr 10 01:56:05 2014 Jenne Update LSC CARM transitioned to IR error signals! [Jenne, EricQ] This      9796   Fri Apr 11 01:02:07 2014 Jenne Update LSC CARM and DARM both on IR signals!!!!!!!!! [EricQ, Jenne] We're still working, but I'm really excited, so here's our news:       9797   Fri Apr 11 02:09:31 2014 Jenne Update LSC CARM and DARM both on IR signals!!!!!!!!! [EricQ, Jenne] A few more details on our work for the evening, of       9798   Fri Apr 11 10:30:48 2014 jamie Update LSC CARM and DARM both on IR signals!!!!!!!!!                                9799   Fri Apr 11 11:58:24 2014 Jenne Update LSC CARM and DARM both on IR signals!!!!!!!!!  A few time series from last night's data.  300 seconds, starting from 1081240100,

Goto page Previous  1, 2, 3 ... 216, 217, 218 ... 352, 353, 354   Next

ELOG V3.1.3-