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ID Date Author Type Category Subject Text   17431   Fri Jan 27 19:35:31 2023 yuta Summary BHD 60 Hz noise investigations around IMC So far different measurements are consistent with the hypothesis that the 60 Hz noise is from PSL frequency noise (40m/17423).  6x    17432   Fri Jan 27 21:22:57 2023 yuta Summary BHD V beam dump installed for BH44 RF PD One of these V beam dumps was installed for BH44 RF PD. The rest is now stored in the box      17433   Mon Jan 30 10:59:15 2023 JC Summary PSL PMC aligned, now PMC transmission is 0.7 PMC hit a drop around mid-day on Saturday and has been going down since. As of now, C1:PSL-PMC_PMCTRANSPD - 0.664      17434   Mon Jan 30 18:08:56 2023 Paco Summary BHD c1cal DAQ error 0x2000 [JC, Paco] I tried restarting all models this afternoon to see if the DC error 0x2000 on      17435   Tue Jan 31 11:02:16 2023 Anchal Summary BHD c1cal DAQ error 0x2000 fixed The 0x2000 error happens when the rtcds model can not acquire the requested number of channels at their data rates. Basically,      17441   Wed Feb 1 16:53:55 2023 Alex Summary General Shadowing Anchal on developing a change for the c1ioo CDS computer During my time shadowing Anchal, we discussed the need for digital control systems on the suspension systems for the 40 meter optics.      17443   Thu Feb 2 19:41:49 2023 Anchal Summary PowerShutdown Recovery from power outage events [Anchal, JC, Radhika, Paco] JC reported that power outage happened twice in 40m today at around 4:17 pm.      17446   Fri Feb 3 17:39:38 2023 yuta Summary BHD 60 Hz noise investigations around IMC, part 2 [Paco, Yuta] We estimated the frequency noise of      17447   Fri Feb 3 17:41:26 2023 Paco Summary BHD Systematic line noise hunting around BH44 [Paco, Yuta]   We devised a plan to systematically      17449   Sun Feb 5 10:25:49 2023 Anchal Summary PowerShutdown Main laser tripping Our main laser has tripped suspiciously twice since the power shutdown. The last time it happened on Thursday Feb 2 night      17450   Sun Feb 5 18:02:46 2023 rana Summary BHD 60 Hz noise investigations around IMC, part 2 For the loop calculation, don't you have to consider the IMC cavity pole? What about the analog filter on the output of      17451   Mon Feb 6 07:58:00 2023 JC Summary PowerShutdown Main laser tripping I came in today and it seems like the main laser tripped again yesterday around 3:00 pm.      17452   Mon Feb 6 11:50:44 2023 Anchal Summary PowerShutdown Main laser tripping [Anchal, JC] During shimmer test yesterday, the man laser tripped again. This morning,      17455   Tue Feb 7 20:10:05 2023 yuta Summary BHD 60 Hz noise investigations around IMC, part 3 [Anchal, Yuta] We have measured OLTF of IMC loop,      17458   Thu Feb 9 10:19:22 2023 yuta Summary BHD 60 Hz noise investigations around IMC, part 4, using ALS BEAT [Anchal, Yuta] Yesterday, we have measured the frequency      17460   Thu Feb 9 17:33:34 2023 yuta Summary BHD 60 Hz noise investigations around IMC, part 6, TTFSS [Anchal, Yuta] Measurements yesterday (40m/17458)      17461   Mon Feb 13 11:54:54 2023 yuta Summary BHD 60 Hz frequency noise is coming from MC1 coils [JC, Yuta] We have found that MC1 coils are causing      17462   Mon Feb 13 17:35:20 2023 Anchal Summary BHD 60 Hz frequency noise is coming from MC1 coils [Anchal, Yuta] We think we have narrowed down the source of 60 Hz noise to one fo      17463   Tue Feb 14 10:49:04 2023 yuta Summary BHD MC1 electronics diagram and cable diconnection tests Below are summary of electronics around MC1 and cable disconnection tests. These suggest that the 60 Hz noise      17466   Wed Feb 15 16:16:59 2023 Anchal Summary BHD IMC optics Coil Output Filter corrections Overtime the coil output filters on IMC optics have drifted into a bad configuration. Today at the meeting, Rana told us the correct      17481   Fri Feb 24 13:29:16 2023 Alex Summary IMC Updated angular actuation calibration for IMC mirrors Also reply to: 40m/17352 Tomohiro, Anchal, and I did the following to make updates to the      17482   Fri Feb 24 13:33:22 2023 Tomohiro Summary IMC Updated angular actuation calibration for IMC mirrors Alex, Anchal, and I did the following to make updated angular actuation calibration for IMC mirrors. This is the revised version      17491   Fri Mar 3 18:47:13 2023 Paco Summary BHD LO phase POS noise coupling - I I tried some LO PHASE noise coupling measurements today. With MICH locked using AS55_Q, I control the LO phase using the single RF (BH55_Q)      17517   Wed Mar 22 18:38:54 2023 Paco Summary BHD "On why BH55 senses the LO phase, a finesse adventure of loss and residual DARM offsets" [Paco, Yehonathan] I took over the finesse calculations Yehonathan had set up for BHD. The notebook      17518   Thu Mar 23 14:20:29 2023 Koji Summary BHD "On why BH55 senses the LO phase, a finesse adventure of loss and residual DARM offsets" This is interesting. With the FPMI, the DARM phase shift is enhanced by the cavity. Therefore, I suppose the effect on the BH55      17521   Thu Mar 23 19:15:39 2023 yuta Summary LSC PRMI locked using REFL55 [Paco, Yuta] We locked PRMI in sideband using REFL55_I and      17522   Fri Mar 24 12:54:51 2023 yuta Summary LSC Actuator calibration of PRM using PRY PRM actuator was calibrated using PRY by comparing the actuation ratio between ITMY. It was measured to be      17523   Fri Mar 24 15:05:41 2023 yuta Summary LSC PRMI sensing matrix and RF demodulation phase tuning PRMI sensing matrix was measured under PRMI locked with REFL55_I and Q. MICH actuator is 0.5*ITMX-0.5*ITMY      17524   Sun Mar 26 19:13:48 2023 yuta Summary LSC PRMI sensing matrix and RF demodulation phase tuning that is really a lot of high precision for the REFL_11 demod phase... for this kind of measurement, I      17525   Mon Mar 27 20:28:57 2023 Paco Summary BHD "On why BH55 senses the LO phase, a finesse adventure of loss and residual DARM offsets" Yuta pointed out that the BH55 signal was weirdly never going to zero, so I actually tuned the demod angle and made sure I was      17526   Tue Mar 28 10:58:03 2023 rana Summary BHD "On why BH55 senses the LO phase, a finesse adventure of loss and residual DARM offsets" but what about including the DC reflectivity imbalance of the arms? there would be another BH55 term from that field maybe.      17528   Wed Mar 29 16:36:04 2023 Paco Summary BHD "On why BH55 senses the LO phase, a finesse adventure of loss and residual DARM offsets" I repeated the calculations but with FPMI (last case was all MICH). The qualitative behavior      17532   Thu Mar 30 16:45:09 2023 Paco Summary LSC PRMI gain estimates and expected flashing at BHD and POP ports Here are our best estimates for the optic transmission (power) coefficients.      17533   Mon Apr 3 12:01:59 2023 Radhika Summary LSC PRMI sensing matrix and RF demodulation phase tuning [Paco, Radhika] We locked PRMI in carrier. We      17534   Tue Apr 4 11:03:35 2023 JC Summary Electronics SR560: reworking <p>I purchased some more of these from DigiKey. These parts are currently in the EE shop. These are replacements for the NDP5565 part      17535   Tue Apr 4 11:10:19 2023 Anchal Summary NeuralNet Testing neural network controller during day time I ran two recently trained neural network controllers today between 10 am and Noon. Each test comprised of four segments:      17536   Wed Apr 5 16:44:31 2023 Radhika Summary LSC PRMI sensing matrix and RF demodulation phase tuning [Paco, Radhika] We calibrated the PRM oplev.      17537   Thu Apr 6 11:49:45 2023 Anchal Summary NeuralNet Testing neural network controller during day time I've turned on NN controller for MC WFS PIT loops. One can disable this controller and go back to linear controller by      17538   Thu Apr 6 21:09:12 2023 Koji Summary NeuralNet Testing neural network controller during day time I'm going to get into the PSL enclosure. Also turn on the HEPA for a while during the intrusion.      17539   Fri Apr 7 16:28:34 2023 Radhika Summary LSC PRMI sensing matrix and RF demodulation phase tuning [Paco, Radhika] To determine the PRM angle-to-length coupling for PRCL, we want to inject pitch/yaw      17541   Wed Apr 12 16:11:41 2023 Radhika Summary LSC PRMI sensing matrix and RF demodulation phase tuning [Yuta, Radhika] We copied the coil balancing procedure found in /scripts/SUS/coilStrengthBalancing/AS1/CoilStrengthBalancing.ipynb      17542   Wed Apr 12 21:32:22 2023 yuta Summary LSC PRMI BHD power measurements [Paco, Yuta] We measured the power around BHD PDs to see if the numbers make sense.      17546   Tue Apr 18 17:37:58 2023 rana Summary ASC RL controller left for overnight Anchal and I turned on another RL policy (ninedwarfs) with Chris's help. It looks to be performing great,      17550   Wed Apr 19 15:12:01 2023 yuta Summary SUS Coil dewhitening check for PRM [Mayank, Paco, Yohanathan, Yuta] We checked if coil dewhitening switch is working by measuring transfer function      17551   Wed Apr 19 17:02:48 2023 Yehonathan Summary SUS Coil dewhitening check for BS and ITMX [Yehonathan, Paco] Repeated the coil dewhitening check for BS. Attachment #1 show      17560   Mon Apr 24 19:11:20 2023 Koji Summary BHD LO/MI(DARM) signal strength comparison between the configurations Yuta and I had a discussion last week about the signal strength between the configurations. Here are some naive calculations.      17565   Wed Apr 26 11:27:49 2023 Paco Summary BHD LO/MI(DARM) signal strength comparison between the configurations with finesse I'm checking Koji + Yuta's not-so-naive calculations using finesse.       17571   Fri Apr 28 20:17:37 2023 yuta Summary ASC IFO alignment in bad shape [Mayank, Paco, Yuta] IFO alignment is not good.      17572   Fri Apr 28 20:56:06 2023 Koji Summary ASC IFO alignment in bad shape I suppose ASS Y arm is using PR2/3 to align the beam to the arm. Can't we have ASS PRM bring the      17574   Mon May 1 14:45:48 2023 Mayank Summary LSC Attenuated BHD DC Beam [Yuta, Mayank] UPDATE: It turned out that the pair of 0.3 OD ND filters we used were not

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