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ID Date Author Type Category Subject Text   1577   Tue May 12 15:22:09 2009 Yoichi Update LSC Arm Finesse [quote] It looks as if the measured DARM response is skewed by an extra low pass filter at      1591   Fri May 15 17:30:00 2009 rob Update LSC arms, coils, locks This is the two arms locked, for an hour.  No integrator in either loop, but from this it looks like ETMY may have a bigger length2angle      1592   Sat May 16 16:20:33 2009 rob Update LSC arms, coils, locks, #2                                1650   Thu Jun 4 01:32:20 2009 rob Configuration LSC AS port mode scan Here is a set of mode scans of the AS port, using the OMC as a mode scanner.  The plot overlays various configurations of the      1661   Mon Jun 8 18:22:27 2009 Alberto DAQ LSC Added PD11 I amd Q slow channels I just added two slow channels to C0EDCUEPICS to monitor the input of PD11. The names are: [C1:LSC-PD11_I_INMON]      1667   Thu Jun 11 03:15:15 2009 Alberto Update LSC DD Handoff attempts Pete, Alberto, tonight we worked on the tuning of the double demod phases for the handoff of      1669   Thu Jun 11 22:14:10 2009 Alberto Update LSC DD Handoff for the Short DOFs completed This afternoon I tuned the handoff script for the SRC, after that Rob eralier during the day had already adjusted that for PRC.      1685   Thu Jun 18 23:20:40 2009 rob Summary LSC I-Q ratio with RF detected DARM This is a ratio of PD1_I to PD1_Q (so a ratio of the two quadratures of AS166), measured in an anti-spring state.  It's not flat      1878   Mon Aug 10 17:27:47 2009 rob Configuration LSC TRX, TRY gain   These are the settings which determine the transmon (eg, TRX) amplitude, and which      1929   Wed Aug 19 18:02:22 2009 Jenne Update LSC RF PDs aligned All of the LSC RF PDs have been aligned.  I didn't really change much of anything, since for all of them, the beam was already      1966   Thu Sep 3 23:41:32 2009 Alberto Configuration LSC POX (PD3) aligned Today I aligned the beam to PD3 (POX) since Steve had moved it. The DC power read 1.3mV when the      1999   Thu Sep 24 20:17:05 2009 rana Summary LSC Comparison of Material Properties for the new RFPD Mounts                                 2016   Tue Sep 29 01:50:10 2009 rob Configuration LSC new modulation frequencies Mode cleaner length measured tonight.   33196198      2101   Fri Oct 16 03:16:50 2009 rana, rob Summary LSC funny timing setup on the LSC While measuring the Piezo Jena noise tonight we noticed that the LSC timing is setup strangely.       2104   Fri Oct 16 13:25:18 2009 Koji Summary LSC funny timing setup on the LSC Could be this. http://ilog.ligo-la.caltech.edu/ilog/pub/ilog.cgi?group=detector&task=view&date_to_view=10/02/2009&anchor_to_scroll_to=2009:10:02:13:33:49-waldman      2111   Sun Oct 18 22:05:40 2009 kiwamu Update LSC LSC timing issue Today I made a measurement to research the LSC timitng issue as mentioned on       2113   Sun Oct 18 23:02:03 2009 Koji Update LSC LSC timing issue You yourself told me that tdsdata uses some downconversion from 32k to 16k! So, how does the downconversion appears      2114   Mon Oct 19 10:00:52 2009 kiwamu Update LSC RE: LSC timing issue Of course I know there is a downconversion in OMC signal from 32k to 16k. But I was just wondering if the delay      2122   Mon Oct 19 23:14:32 2009 kiwamu Update LSC LSC timing issue I measured the noise spectrum of LSC_DARM_IN1 and OMC-LSC_DRIVE_EXC by using DTT,      2126   Tue Oct 20 16:35:24 2009 rob Configuration LSC 33MHz Mod depth The 33MHz mod depth is now controlled by the OMC (C1:OMC-SPARE_DAC_CH_15).  The setting to give us the same modulation depth      2145   Mon Oct 26 18:49:18 2009 kiwamu Update LSC OMC-LSC timing issue According to my measurements I conclude that LSC-signal is retarded from      2146   Mon Oct 26 19:12:50 2009 kiwamu Update LSC diagnostic script for LSC timing The diagnostic script I've written is available in the 'caltech/users/kiwamu/work/20091026_OMC-LSC-diag/src'. To run the script, you can just execute      2153   Tue Oct 27 19:37:03 2009 kiwamu Update LSC cron job to diagnose LSC-timing I set a cron job on allegra.martian to run the diagnostic script every weekend.      2167   Mon Nov 2 10:56:09 2009 kiwamu Update LSC cron job works succesfully & no timing jitter As I wrote on Oct.27th, the cron job works every Sunday.      2174   Wed Nov 4 16:49:32 2009 Alberto Update LSC Arm Cavity Finesse Measurement I'm going to work on the X arm to measure the arm cavity finesse. The idea is to measure the cavity      2175   Wed Nov 4 18:35:19 2009 Alberto Update LSC Arm Cavity Finesse Measurement                    2176   Wed Nov 4 21:46:18 2009 Alberto Update LSC Arm Cavity Finesse Measurement                    2177   Wed Nov 4 23:17:51 2009 Alberto Update LSC X Arm Cavity transfer Function I measured the transfer function between MC_TRANS and TRX and I'm attaching the result.      2178   Thu Nov 5 05:07:22 2009 rana Update LSC X Arm Cavity transfer Function I would have guessed that you have to calibrate the detectors relative to each other before trying this. Its also going to be tricky      2184   Thu Nov 5 19:25:11 2009 Alberto Update LSC X Arm Cavity transfer Function                                2185   Thu Nov 5 22:30:09 2009 Alberto Update LSC X Arm Cavity Transfer Function It seems that just repeating the measurement was enough to get a good transfer function of the x arm cavity. Here's what I got.      2186   Thu Nov 5 23:09:34 2009 Alberto Update LSC Y Arm Cavity Transfer Function As for the X Arm, this the transfer function I measured for the Y arm cavity.      2188   Fri Nov 6 00:24:06 2009 Alberto Update LSC Y Arm Cavity Transfer Function                    2189   Fri Nov 6 00:40:29 2009 Alberto Update LSC Everything put back as it was I disconnected the setup for the arm cavity TF measurement. I opened the scitation switch on the ISS medm screen. I reconnected the      2208   Mon Nov 9 11:11:19 2009 Alberto Configuration LSC MC2 Watchdogs tripped The MC2 watchdogs tripped. I just restored them. I also had to relock the MZ and then      2217   Mon Nov 9 15:11:02 2009 Alberto Update LSC Everything put back as it was                                2226   Tue Nov 10 13:02:36 2009 Alberto Update LSC X and Y Arm Cavity Poles Measurement From fitting the arm cavity transfer functions I got the following values for the cavity pole frequencies.      2247   Thu Nov 12 02:02:18 2009 rana Summary LSC Arm Locking with no feedback to the ETM or ITM Steps: 1) Turn off feedback to ETMY (the ETMY button on the LSC screen).      2277   Mon Nov 16 17:35:59 2009 kiwamu Update LSC OMC-LSC timing get synchronized ! An interesting thing was happened in the OMC-LSC timing clock. Right now the      2317   Mon Nov 23 21:30:29 2009 Jenne Update LSC Measured MC length With Koji's help, I measured the length of the Mode Cleaner. The new modulation frequencies (as      2319   Tue Nov 24 08:00:16 2009 rana Update LSC Measured MC length I propose that from now on, we indicate in the elog what frequencies we're referring to. In this case, I guess its the front panel      2320   Tue Nov 24 10:36:21 2009 Koji Update LSC Measured MC length What I meant was the VCO driver, not the FSS box. As for the frequency, all written      2350   Thu Dec 3 15:55:24 2009 Alberto AoG LSC RF AM Stabilizer Output Power Today I measured the max output power at the EOM output of one of the RF AM Stabilizers that we use to control the modulation depth.      2384   Thu Dec 10 13:10:25 2009 Alberto Configuration LSC 166 LO Disconnected I temporarily disconnected the Heliax cable that brings the 166MHz LO to the LSC rack. I'm doing a couple of measurement      2389   Thu Dec 10 17:05:21 2009 Alberto Configuration LSC 166 MHz LO SMA-to-Heliax connection repaired I replaced the SMA end connector for the 166 MHZ Local Oscillator signal that goes to the back of the flange in the 1Y2 rack.      2393   Thu Dec 10 18:31:44 2009 Alberto Configuration LSC 166 LO Disconnected                                2395   Fri Dec 11 09:30:09 2009 Koji Configuration LSC 166 LO Disconnected They must not be dBm, must be dB       2396   Fri Dec 11 11:42:26 2009 Alberto Configuration LSC 166 LO Disconnected                                2398   Fri Dec 11 14:12:32 2009 rana Configuration LSC 166 LO Disconnected    Seems like very strange cable loss numbers. The Heliax is lossier than      2402   Fri Dec 11 19:51:13 2009 Alberto Configuration LSC 166 LO Disconnected

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