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ID Date Author Type Category Subject Text   15339   Wed May 20 18:45:22 2020 Hang Update BHD BHD mode-matching study--corner plot & adjustment requirement As Rana suggested, we present the scattering plot of the AS path mode matching for various variables.      15338   Tue May 19 15:39:04 2020 Yehonathan Update Loss Measurement 40m Phase maps loss estimation I have a serious concern about this low angle scattering analysis: Phase maps perturb the spatial      15337   Tue May 19 15:24:06 2020 rana Update BHD BHD mode-matching study It would be good to have a corner plot with all the distances/ RoCs. Also perhaps a Jacobian      15336   Mon May 18 18:00:16 2020 Hang Update BHD BHD mode-matching study [Jon, Tega, Hang] We proposed a few BHD mode-matching telescope designs and then preformed a few monte-carlo      15335   Fri May 15 19:10:42 2020 gautam Update SUS All watchdogs tripped, now restored This EQ in Nevada seems to have tripped all watchdogs. ITMX was stuck. It was released, and all      15334   Fri May 15 09:18:04 2020 Jon Update BHD BHD telescope designs accounting for ASC Hang and I have reanalyzed the BHD telescope designs, with the goal of identifying sufficiently non-degenerate locations for      15333   Thu May 14 19:00:43 2020 Yehonathan Update Loss Measurement 40m Phase maps loss estimation Perturbation theory: The cavity modes       15332   Thu May 14 12:21:56 2020 Yehonathan Update Loss Measurement 40m Phase maps loss estimation I finished calculating the X Arm loss using first-order perturbation theory. I will post the details of the calculation later.      15331   Thu May 14 00:47:55 2020 gautam Summary Computer Scripts / Programs pcdev1 added to authorized keys on nodus This is to facilitate the summary page config fines to be pulled from nodus in a scripted way, without being asked for authentication.      15330   Thu May 14 00:21:03 2020 gautam Update LSC CM board boosts Summary: I think the boosts that are currently stuffed on the CM board are too      15329   Wed May 13 15:13:11 2020 Yehonathan Update Loss Measurement 40m Phase maps loss estimation Koji pointed out during the group meeting that I should compensate for local tilt when I move the beam around the mirror for calculating      15328   Tue May 12 22:47:49 2020 gautam Update LSC Relative importance of losses in the arm and PRC Yes, \eta_A is the (average) round-trip loss for an arm cavity. I'd estimate this is ~100ppm currently. I edited the original      15327   Tue May 12 20:16:31 2020 Koji Update LSC Relative importance of losses in the arm and PRC Is \eta_A the roundtrip loss for an arm? Thinking about the PRG=10 you saw: - What's the current PR2/3 AR?      15326   Tue May 12 18:16:17 2020 gautam Update LSC Relative importance of losses in the arm and PRC Attachment #1 is meant to show      15325   Tue May 12 17:51:25 2020 rana Summary Computer Scripts / Programs updated LESS syntax highlight on nodus apt install source-highlight then modified bashrc to point to /usr/share instead of /usr/bin      15324   Mon May 11 00:12:34 2020 gautam Update LSC RF only PRFPMI Finally - Attachment #1. This plot uses      15323   Sat May 9 17:01:08 2020 Yehonathan Update Loss Measurement 40m Phase maps loss estimation I took the phase maps of the 40m X arm mirrors and calculated what is the loss of a gaussian beam due to a single bounce. I      15322   Fri May 8 14:27:25 2020 Hang Update BHD New SRC gouy phase [Jon, Hang] After updating the 40 m finesse file to incorporate the new SRC length (and      15321   Thu May 7 10:58:06 2020 gautam Update ASC IMC WFS OK so the QPD segments are in the "+" orientation when the 40m IMC WFS heads are mounted at 45 deg. I thought "+"      15320   Thu May 7 09:43:21 2020 rana Update ASC IMC WFS This is the doc from Keita Kawabe on why the WFS heads should be rotated.      15319   Wed May 6 00:31:09 2020 gautam Update ALS Optomechanics during CARM offset reduction Summary: The apparent increase in the ALS noise (witnessed in-loop, e.g.       15318   Tue May 5 23:44:14 2020 gautam Update ASC IMC WFS Summary: I've been thinking about the IMC WFS. I want to repeat the sort of analysis      15317   Sat May 2 02:35:18 2020 Koji Update ALS ASY M2 PZT damaged Yes, we are supposed to have a few spare PI PZTs.      15316   Fri May 1 22:44:17 2020 gautam Update ALS ASY M2 PZT damaged I went to EY and saw that the HV power supply was only putting out 50 V and had hit the current limit of 10 mA (nominally,      15315   Fri May 1 01:49:55 2020 gautam Update ALS ASY commissioning Summary: It appears that the EY green steering PZTs have somehow lost their bipolar actuation      15314   Thu Apr 30 07:29:01 2020 Chub Update VAC N2 delivered. Hi All, The new nitrogen cylinders were delivered to the rack at the west entrance.      15313   Fri Apr 24 00:26:59 2020 rana Summary PEM L.A. EQ from Tuesday night        15312   Thu Apr 23 10:42:02 2020 rana Update PSL FSS debugging attempts I had set up the 4395 to do this automatically a few years ago, but it looked at the FSS/IMC instead. When the PCDRIVE      15311   Thu Apr 23 09:52:02 2020 Jon Update Cameras GigE w better NIR sensitivvity Nice, and we should also permanently install the camera server (c1cam) which is still sitting on the electronics      15310   Wed Apr 22 17:29:14 2020 gautam Update PSL FSS debugging attempts Summary: On Monday, I hooked up an AG4395 to the PMC error point (using the active      15309   Wed Apr 22 13:52:05 2020 gautam Update DetChar Summary page revival Covid 19 motivated me to revive the summary pages. With Alex Urban's help, the infrastructure was modernized, the wiki      15308   Mon Apr 20 17:49:58 2020 gautam Update General Some housekeeping Empty N2 replaced.  Logged back into zita and started      15307   Sat Apr 18 14:57:44 2020 Yehonathan Update Loss Measurement Arm transfer function measurement Ok, now I understand my foolishness. It should definitely be 1/sqrt(f^2+fp^2) .      15306   Sat Apr 18 13:32:31 2020 rana Update Cameras GigE w better NIR sensitivvity There's this elog from Stephen about better 1064 sensitivity from Basler. We should consider      15305   Thu Apr 16 21:13:20 2020 Jon Update BHD BHD optics specifications Summary I've generated specifications for the new BHD optics. This includes the suspended relay mirrors as      15304   Wed Apr 15 15:15:17 2020 Chub Update VAC nitrogen cylinders delivered Four nitrogen cylinders replaced the empties in the rack at the west entrance.  Additionally, Airgas will now deliver only once a week.      15303   Tue Apr 14 23:50:06 2020 Koji Update General 40m power glitch recovery [Koji / Gautam (Remote)] Lab status      15302   Mon Apr 13 16:51:49 2020 rana Summary DAQ NODUS: rsyncd daemon / service set up I just now modified the /etc/rsyncd.conf file as per Dan Kozak's instructions. The old conf file is still there with the      15301   Mon Apr 13 15:28:07 2020 Koji Update General Power Event and recovery [Larry (on site), Koji & Gautam (remote)] Network recovery      15300   Tue Apr 7 15:30:40 2020 Jon Summary NoiseBudget 40m noise budget migrated to pygwinc In the past year, pygwinc has expanded to support not just fundamental noise calculations (e.g., quantum, thermal) but also any number of      15299   Tue Apr 7 10:56:39 2020 Jon Update BHD BHD front-end complication Quote:      15298   Mon Apr 6 16:46:40 2020 gautam Update ASC POP angular FF filters trained and tested I don't have a recent measurement of the optical gain of this config so I can't undo the loop, but in-loop performance doesn't      15297   Mon Apr 6 12:26:07 2020 rana Update ASC POP angular FF filters trained and tested that's pretty great performance. maybe you can also upload some code so that we can do it later too - or maybe in the 40m      15296   Fri Apr 3 17:15:53 2020 gautam Update ASC POP angular FF filters trained and tested Summary: Using the data I collected yesterday, the POP angular FF filters have been trained.      15295   Fri Apr 3 13:40:07 2020 Jon Update BHD BHD front-end complication I wanted to pass along a complication pointed out by K. Thorne re: our plan to use Gen1 (old) Dolphin IPC cards in the new real-time      15294   Fri Apr 3 12:09:53 2020 Jon Update CDS C1AUXEY wiring + channel list Quote:      15293   Thu Apr 2 22:19:18 2020 Koji Update CDS C1AUXEY wiring + channel list We want to migrate the end shutter controls from c1aux to the end acromags. Could you include them to the list if not yet?      15292   Thu Apr 2 16:31:33 2020 Jon Update CDS C1AUXEY wiring + channel list Quote:      15291   Thu Apr 2 15:53:01 2020 gautam Update ASC PRMI 1f locked for collecting feedforward data This afternoon, I kept the PRM locked for ~1hour and then measured transfer functions from the PRM angular actuators to the POP      15290   Wed Apr 1 00:51:41 2020 gautam Update Wiener Slightly improved MCL FF Summary: Retraining the MCL filters resulted in a slight improvement in the performance.

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