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ID Date Author Type Category Subject Text   17368   Tue Dec 20 23:32:58 2022 rana Update ASC WFS demodulation board modification - further study That's great - I think this solution will be best. Having the PLLs actually gives us some problems - the square wave action      17348   Thu Dec 8 20:40:14 2022 Anchal Update ASC WFS demodulation board modification attempt Based on the previous two elog posts, Koji and I decided that we should use 11 MHz signal for arm cavity ASC and modify a spare WFS      17363   Fri Dec 16 21:55:54 2022 Anchal Update ASC WFS demodulation board modification attempt 2 - sort of working [Koji, Anchal] short version: We checked signals at different points in the circuit to make      6660   Tue May 22 13:06:11 2012 Jenne Update IOO WFS didn't turn off automatically I just sat down in the control room, and discovered the PMC (and everything else) unlocked.  I relocked the PMC, but the      6669   Wed May 23 21:32:15 2012 Suresh Update IOO WFS didn't turn off automatically                                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      14858   Thu Sep 5 18:42:19 2019 aaron HowTo CDS WFS discussion, restarting CDS [aaron, rana] While going to take some transfer functions of the MC WFS loop, LSC was down.      14859   Thu Sep 5 20:30:43 2019 rana HowTo CDS WFS discussion, restarting CDS via Polish chat, GV tells us to RTFE      14860   Fri Sep 6 09:40:56 2019 aaron HowTo CDS WFS discussion, restarting CDS As suggested, I ran the script cds/rebootC1LSC.sh I got a timeout error when the script tried closing the PSL shutter ('C1:AUX-PSL_ShutterRqst'      14861   Fri Sep 6 11:56:44 2019 aaron HowTo CDS WFS discussion, restarting CDS Rebooting I reset c1lsc, c1sus, and c1ioo. I noticed that the script gives      14862   Fri Sep 6 15:12:49 2019 Koji HowTo CDS WFS discussion, restarting CDS Assuming you are at pianosa, /etc/resolv.conf is like #      6992   Thu Jul 19 02:32:45 2012 Jenne Update IOO WFS don't come on automatically?? The MC unlocked ~20 min ago, correlated with 2 consecutive earthquakes in Mexico.  The MC came back fine after a few minutes,      12897   Tue Mar 21 21:21:58 2017 gautam Update IOO WFS filter banks updated The arrangement of filters in the WFS loop filter banks have been altered, Rana will update with details of the motivation behind      15741   Sat Dec 19 20:24:25 2020 gautam Update Electronics WFS hardware install I installed 4 chassis in the rack 1X2 (characterization on the E-bench was deemed satisfactory, I will upload the analysis later). I ran out      14945   Mon Oct 7 14:51:20 2019 aaron Update Electronics WFS head RF measurements Mon Oct 7 14:51:53 2019. I closed the PSL shutter to measure the WFS head responsivity. I made a thru calibration as in      14951   Tue Oct 8 16:00:06 2019 aaron Update Electronics WFS head RF measurements I simulated this circuit with zero, but haven't gotten the results to match the measurements above.      14959   Wed Oct 9 12:15:05 2019 rana Update Electronics WFS head RF measurements It would be good if you and Shruti can look at how to change the parameters in Zero so as to do a fit to the measured data. Usually,      15731   Thu Dec 10 22:46:57 2020 gautam Update ASC WFS head assembled The assembly of the head is nearly complete, I thought I'd do some characterization before packaging everything up too nicely.      15736   Thu Dec 17 15:23:56 2020 gautam Update ASC WFS head characterization Summary: I think the WFS head performs satisfactorily. The (input-referred) dark      17217   Mon Oct 31 21:04:43 2022 Koji Update ASC WFS inspection Inspected the lab to see what we can do about the IFO WFS: WFS heads 1      17048   Fri Jul 29 22:37:54 2022 Koji Update IOO WFS investigation I wanted to check what's wrong with the WFS. I played with MC2 misalignment      17053   Tue Aug 2 01:10:26 2022 Koji Update IOO WFS investigation Continued to work on the WFS repair Demod phase adjustment: - Use the PDH signal to      17059   Thu Aug 4 21:58:18 2022 Koji Update IOO WFS investigation OK... It seems that all the 6 dof of the IMC WFS servo loops were closed with some condition...      17060   Thu Aug 4 22:14:20 2022 Koji Update IOO WFS investigation Sensing matrix measurement MCx_ASCyyy_EXC was shaken with the amplitude of 3000 cnt. Measure the transfer      17061   Thu Aug 4 22:14:38 2022 Koji Update IOO WFS investigation WFS/MCTRANS_QPD Power Spectra Attachment 1: HEPA ON WFS1/2 PIT/YAW Spectra are stabilized      16943   Fri Jun 24 12:13:16 2022 JC Update IOO WFS issues [Yuta, JC] It seems that early this morning MC got very misaligned. Yuta was able to      16946   Sat Jun 25 14:29:48 2022 Anchal Update IOO WFS issues This issue is very weird and still unresolved. Without WFS loops, we'll have to realign IMC often and we might loose IMC alignment      16947   Sat Jun 25 20:23:59 2022 Koji Update IOO WFS issues I could run the WFS servo (6dofs) for more than 15min by flipping the sign for the MC2 Pit and WFS1 Yaw. (See attachments)      16949   Mon Jun 27 12:32:45 2022 yuta Update IOO WFS issues fixed        16835   Fri May 6 13:48:34 2022 Anchal Update BHD WFS loop instability fixed [Yuta, Anchal] We investigated why WFS loop wasn't working. It seemed like WFS1 PIT error signal      14876   Fri Sep 13 10:53:40 2019 aaron Update IOO WFS loop measurements I'm scripting the WFS sensing matrix measurements. I haven't really scripted DTT before, so I'm trying to find documentation      14878   Mon Sep 16 05:08:04 2019 rana Update IOO WFS loop measurements not need to use DTT. I'm attaching some half-finished notebooks that give the gist.      14880   Mon Sep 16 11:55:58 2019 rika Update IOO WFS loop measurements [rika, aaron] We aligned optics of WFS as it was. Now auto-locker is working to lock MC.      14886   Tue Sep 17 09:41:48 2019 gautam Update IOO WFS loop measurements Let's not worry about C1LSC until the c1iscaux      14887   Tue Sep 17 10:34:48 2019 aaron Update IOO WFS loop measurements I'm using the notebooks from rana as a starting point, and making a script to measure and fill the WFS sensing matrix.      14888   Tue Sep 17 10:47:44 2019 rika Update IOO WFS loop measurements [aaron, rika] Once stop the auto-locker and realigned to make beam to get into QPD again.      14896   Wed Sep 18 14:45:52 2019 rika Update IOO WFS loop measurements [aaron, rika] Gettng TFs In the data we got yesterday, we can see some filter's      14957   Tue Oct 8 20:39:42 2019 aaron Update IOO WFS loop measurements I installed nds2 on donatello with yum, but still can't import nds2.      14958   Wed Oct 9 09:37:28 2019 aaron Update IOO WFS loop measurements I installed nds2 again, this time successfully with      14868   Tue Sep 10 15:41:37 2019 aaron Update IOO WFS measurements [rika, aaron, rana] We are getting the MC locked in anticipation of making some WFS transfer      14871   Wed Sep 11 10:26:56 2019 aaron Update IOO WFS measurements Gameplan We should also have a plan for the next couple weeks so we are organized; heavily adapted      14872   Wed Sep 11 14:37:43 2019 aaron Update IOO WFS measurements [aaron, rika] We identified the Jenne laser and found a long optical fiber that might be      14874   Thu Sep 12 12:42:31 2019 aaron Update IOO WFS measurements [rika, aaron] At Seiji and Gautam's suggestion, we added an additional RF photodiode (NewFocus      14875   Fri Sep 13 10:36:03 2019 aaron Update IOO WFS measurements [rika, aaron] We are at it again. Rika is setting up the TF measurement, I'm looking into      14882   Mon Sep 16 12:38:59 2019 aaron Update IOO WFS measurements I wanted to make a zero model of this circuit to get a handle on the results. I couldn't import zero on pianosa, and I tried pip installing      14929   Thu Oct 3 11:38:35 2019 aaron Update IOO WFS measurements I set up the spectrum analyzer to make the WFS head RF transfer function measurement (V/W) on WFS1. I placed the Jenne laser on      9526   Tue Jan 7 16:41:08 2014 manasa Update IOO WFS moving MC suspensions                                17497   Wed Mar 8 09:17:21 2023 rana Update IMC WFS noise ON/OFF WFS error signal spectra w loops ON (G=4) and OFF. Current output matrix also attached.      6612   Mon May 7 12:57:34 2012 Den Update IOO WFS noise in MC I've measured coherence between seismometer signals and OSEMS of MC 1,2,3      6613   Mon May 7 17:28:29 2012 Den Update IOO WFS noise in MC

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