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ID Date Author Type Category Subject Text   16658   Thu Feb 10 17:57:48 2022 Anchal Update General Scheduled power outage recovery - Locking mode cleaner(s) Something is wrong with the Video MUX. The system did not turn back on with full functionality. Even though we see the screens      16659   Thu Feb 10 19:03:23 2022 Koji Update General Scheduled power outage recovery - Locking mode cleaner(s) I came back to the 40m and started the investigation. If I ping 192.168.113.92, it responds.      16660   Thu Feb 10 19:46:37 2022 Koji Update General Scheduled power outage recovery - Locking mode cleaner(s) == Assign new IP address to c1sus2 == cf: [40m      16661   Thu Feb 10 21:10:43 2022 Koji Update General Video Mux setting reset Now the video matrix is responding correctly and the web interface shows up. (Attachment 1)      16665   Fri Feb 11 11:17:00 2022 Anchal Update General Scheduled power outage recovery I found that two computers are not powering up in the control room, Ottavia and Allegra. Allegra was important for us as it had the      16667   Fri Feb 11 16:09:11 2022 Anchal Update General Scheduled power outage recovery - Input power increased We increased the input power to IMC by replacing the 98% transmission BS by a 10% transmission BS on the detection table (reverse      16669   Mon Feb 14 18:31:50 2022 Paco Update General Scheduled power outage recovery - IMC recovery progress [Paco, Anchal, Tega] We have been realigning the IMC as of last Friday (02/11). Today we made      16670   Mon Feb 14 18:43:49 2022 Paco Summary General SOS materials clean room cleared [Yehonathan, Paco] We put away most items used / involved in SOS assembly and characterization. Many      16671   Mon Feb 14 21:03:25 2022 Koji Update General Scheduled power outage recovery I opened the boxes. Allegra has obvious vent of at least 4 caps. And the power supply did not respond even a paper clip test was      16672   Tue Feb 15 19:32:50 2022 Koji Update General Scheduled power outage recovery - IMC recovery progress Reduced the IMC power to 100mW Setup: The power meter was placed right before the final aperture      16673   Tue Feb 15 19:40:02 2022 Koji Update General IMC locking IMC is locking now. There was nothing wrong: just a careful alignment +      16674   Wed Feb 16 15:19:41 2022 Anchal Update General Reconfigured MC reflection path for low power I reconfigured the MC reflection path for low power. This meant the following changes: Replaced the 10% reflection      16676   Wed Feb 23 15:08:57 2022 Anchal Update General Removed extra beamsplitter in MC WFS path As discussed in the meeting, I removed the extra beam splitter that dumps most of the beam going towards WFS photodiodes.       16677   Thu Feb 24 14:32:57 2022 Anchal Update General MC RFPD DCMON channel got stuck to 0 I found a peculiar issue today. The C1:IOO-MC_RFPD_DCMON remains constantly 0. I wonder if the RFPF output is being read properly. I opened the      16679   Thu Feb 24 19:26:32 2022 Anchal Update General IMC Locking I think I have aligned the cavity, including MC1 such that we are seeing flashing of fundamental mode and significant transmission sum value      16685   Sun Feb 27 00:37:00 2022 Koji Update General IMC Locking Recovery Summary: - IMC was locked. - Some alignment change in the output      16686   Sun Feb 27 01:12:46 2022 Koji Update General IMC manual alignment procedure We expect that the MC sus are susceptible to the temperature change and the alignment drifts away with time.      16725   Tue Mar 15 10:45:31 2022 Paco Update General Assembled small in-vac optics [Paco] This morning I assembled LO3, LO4 and AS3 (all      16775   Wed Apr 13 16:23:54 2022 Ian MacMillan Update General Smell in 40m [Ian, Paco, JC] There is a strange smell in the 40m. It smells like a chemically burning      16784   Mon Apr 18 15:17:31 2022 Jancarlo Update General Tool box and Work Station Organization I cleaned up around the 40 m lab. All the Laser Safety Glasses have been picked up and placed on the rack at the entrance.      16787   Mon Apr 18 23:22:39 2022 Koji Update General Tool box and Work Station Organization Whoa! Thanks!      16808   Mon Apr 25 14:19:51 2022 JC Update General Nitrogen Tank Coming in this morning, I checked on the Nitrogen tanks to check the level. One of the tanks were empty, so I went ahead and      16809   Mon Apr 25 14:49:02 2022 Koji Update General Nitrogen Tank For your (and mine) info: N2 pressure can be monitored on the 40m summary page: https://nodus.ligo.caltech.edu:30889/detcharsummary/day/20220425/vacuum/      16901   Wed Jun 8 16:33:26 2022 Koji Update General Power Outage 220608: HVAC restored I found the HVACs for the ends were off. They were turned back on.      16921   Wed Jun 15 17:12:39 2022 Cici Summary General Preparation for AUX Loop Characterization [Deeksha, Cici] We went to the end Xarm station and looked at the green laser setup and electronics.      16926   Thu Jun 16 19:49:48 2022 Cici Update General Using the SR785 [Deeksha, Cici] We used a python script to collect data from the SR785 remotely. The SR785 is      16933   Tue Jun 21 14:59:22 2022 Cici Summary General AUX Transfer Function Loop Exploration [Deeksha, Cici] We learned about the auxillary laser control loop, and then went into the      16944   Fri Jun 24 13:29:37 2022 Yehonathan Update General OSEMs from KAGRA The box was given to Juan Gamez (SURF)      16950   Mon Jun 27 13:25:50 2022 Cici Update General Characterizing the Transfer Loop [Deeksha, Cici] We first took data of a simple low pass filter, and attempted to perform      16953   Tue Jun 28 09:03:58 2022 JC Update General Organizing and Cleaning The plan for the tools in 40m As of right now, there are 4 tool      16955   Tue Jun 28 16:26:58 2022 Cici Summary General Vector fitting open loop transfer function/Audio cancellation of optical table enclosure [Deeksha, Cici] We attempted to use vectfit to fit our earlier transfer function data, and      16982   Fri Jul 8 23:10:04 2022 Koji Summary General July 9th, 2022 Power Outage Prep The 40m team worked on the power outage preparation. The detailed is summarized on this wiki page. We will still be able to      16988   Mon Jul 11 19:29:23 2022 Paco Summary General Finalizing recovery -- timing issues, cds, MC1 [Yuta, Koji, Paco] Restarting CDS We were having      16993   Tue Jul 12 18:35:31 2022 Cici Hanna Summary General Finding Zeros/Poles With Vectfit Am still working on using vectfit to find my zeros/poles of a transfer function - now have a more specific project in mind, which      17003   Thu Jul 14 19:09:51 2022 rana Update General EQ recovery There was a EQ in Ridgecrest (approximately 200 km north of Caltech). It was around 6:20 PM local time.      17006   Fri Jul 15 16:20:16 2022 Cici Hanna Update General Finding UGF I have temporarily abandoned vectfit and aaa since I've been pretty unsuccessful with them and I don't need poles/zeroes      17021   Wed Jul 20 11:58:45 2022 Paco Summary General Jenne laser kaput? [Paco, Yehonathan, JC] We were trying to setup the Jenne laser to characterize the response of three      17022   Wed Jul 20 14:12:07 2022 Paco Summary General Jenne laser kaput! [Koji, Yehonathan, Paco] Koji pointed out that this laser was always driven with a current driver (which      17023   Wed Jul 20 15:58:52 2022 Koji Summary General Jenne laser kaput! For troubleshooting, the proper laser driver (found beneath the AG network analyzer) was connected.      17027   Fri Jul 22 17:43:19 2022 Koji Update General Obtained a functional CRT [Koji Paco] Koji went to Downs and found a CRT labeled "for 40m Rana?". So      17030   Mon Jul 25 09:05:50 2022 Paco Summary General Testing 950nm laser found in trash pile [Paco, Yehonathan] ==== Late elog from Friday ==== Koji provided us with a QFLD-950-3S      17051   Mon Aug 1 17:19:39 2022 Cici Summary General RPitaya Data on Jupyter Notebook Have successfully plotted data from the Red Pitaya on Jupyter Notebook! Have lost years of my life fighting with PyQt.      17055   Wed Aug 3 15:01:13 2022 Koji Update General Borrowed Dsub cables Borrowed DSUB cables for Juan's SURF project      17064   Fri Aug 5 17:03:31 2022 Yehonathan Summary General Testing 950nm laser found in trash pile I set out to test the actuation bandwidth of the 950nm laser. I hooked the laser to the output of the bias tee of PD testing      17070   Wed Aug 10 15:33:59 2022 Cici Update General Working Red Pitaya VNA TL;DR: I am now able to inject a swept sine and measure a transfer function with python on my Red Pitaya! Attached is      17071   Wed Aug 10 19:24:19 2022 rana Update General Working Red Pitaya VNA                  Boom!      17072   Wed Aug 10 19:36:45 2022 Koji Bureaucracy General Lab cleaning and discovery During the cleaning today, we found many legacy lab items. Here are some policies what should be kept / what should be disposed      17076   Thu Aug 11 17:15:33 2022 Cici Update General Measuring AUX Laser UGF with Red Pitaya TL;DR: Have successfully measured the UGF of the AUX laser on my Red Pitaya! Attached is one of my data runs (pdf + txt file).       17077   Fri Aug 12 02:02:31 2022 Koji Update General Power Outage Prep: nodus /home/export backup Took the backup (snapshot) of /home/export as of Aug 12, 2022 controls@nodus>      17078   Fri Aug 12 13:40:36 2022 JC Update General Preparing for Shutdown on Saturday, Aug 13 [Yehonathan, JC] Our first step in preparing for the Shutdown was to center all the OpLevs.

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