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ID Date Author Type Category Subject Text   16974   Wed Jul 6 18:51:20 2022 Deeksha Update Electronics Measuring the Transfer Function of the PZT Yesterday, we set up the loop to measure the PZT of the transfer function - the MokuLab sends an excitation (note - a swept sine      16973   Wed Jul 6 15:28:18 2022 Tega Update SUS Output matrix diagonalisation : F2P coil balancing git repo : https://git.ligo.org/40m/scripts/-/tree/main/SUS/OutMatCalc local dir:       16972   Tue Jul 5 20:05:06 2022 Tomislav Update Electronics Whitening electronics noise For whitening electronics noise for WFS1, I get (attachment). This doesn't seem right, right?      16969   Fri Jul 1 12:49:52 2022 Koji Update IOO MC2 seemed misaligned / fixed I found the IMC was largely misaligned and was not locking. The WFS feedback signals were saturated and MC2 was still largely      16968   Fri Jul 1 08:50:48 2022 yuta Summary LSC FPMI with REFL/AS55 trial [Anchal, Paco, Yuta] We tried to lock FPMI with REFL55 and AS55 this week, but no success yet.      16967   Thu Jun 30 19:24:24 2022 rana Summary PEM effect of nearby CES construction For the proposed construction in the NW corner of the CES building (near the 40m BS chamber), they did a simulated construction      16966   Thu Jun 30 19:04:55 2022 rana Summary PSL PSL HEPA: How what when why For the PSL HEPA, we wanted it to remain at full speed during the vent, when anyone is working on the PSL, or when there is a      16965   Thu Jun 30 18:06:22 2022 Paco Update ALS Optimum ALS recovery - part I [Paco] In the morning I took some time to align the AUX beams in the XEND table.      16964   Thu Jun 30 17:19:55 2022 Deeksha Summary Electronics Measured Transfer Functions of the Control Loop, Servo (OLTF); got Vectfit working [Cici, Deeksha] We were able to greatly improve the quality of our readings by changing the      16963   Wed Jun 29 18:53:38 2022 rana Update Electronics Electronics noise this is just the CDS error signal, but is not the electronics noise. You have to go into the lab and measure the noise at      16962   Wed Jun 29 14:28:06 2022 Paco Summary ALS ALS beat allan deviation (XARM) I guess it didn't make sense since f_beat can be arbitrarily moved, but the beat is taken around the PSL freq ~ 281.73      16961   Tue Jun 28 23:10:34 2022 Yehonathan Update BHD Measurement of AS55 demod board conversion factor {Yuta, Yehonathan} We measured the AS55 demod board conversion from the amplitude of a 55MHz      16960   Tue Jun 28 22:27:11 2022 Yehonathan Update BHD Measurement of input and output electronics noise {Yuta, Yehonathan} For MICH noise budgeting we measure the input electronics noise which includes      16959   Tue Jun 28 18:53:16 2022 rana Summary ALS ALS beat allan deviation (XARM) what's the reasoning behind using df/f_beat instead of df/f_laser ?      16958   Tue Jun 28 18:19:09 2022 Tomislav Update Electronics Electronics noise I measured electronics noise of WFSs and QPD (of the WFS/QPD, whitening, ADC...) by closing PSL and measuring the error signal.      16957   Tue Jun 28 17:07:47 2022 Anchal Update Calibration Added Beatnote channels in demodulation of c1cal I added today demodulation of C1:LSC-BEATX/Y_FINE_I/Q in the c1cal demodulation where different degrees of freedom can be dithered. For McCal      16956   Tue Jun 28 16:59:35 2022 Paco Summary ALS ALS beat allan deviation (XARM) [Paco] I took ~ 7 minutes of XALS beatnote data with the XAUX laser locked to the XARM      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      16954   Tue Jun 28 14:24:23 2022 yuta Update BHD BHD DC PD signals now also sent to c1lsc to circumvent IPC error [JC, Yuta] To circumvent IPC error sending BHD DC PD signals from c1sus2 to c1lsc, DB9      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      16952   Mon Jun 27 18:54:27 2022 yuta Update LSC Modulation depths measurement using Yarm cavity scan [Yehonathan, Yuta] EDITED by YM on 22:11 June 27, 2022 to correct for      16951   Mon Jun 27 13:39:40 2022 Deeksha Update Electronics Setting up the MokuLab [Cici, Deeksha] On Friday Cici and I set up the Mokulab to take readings of our loop. The      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      16949   Mon Jun 27 12:32:45 2022 yuta Update IOO WFS issues fixed        16948   Sat Jun 25 22:18:41 2022 Tomislav Update ASC Simulation and reality comparisons In the attachment please find plots comparing controller output, local damping output, and error signals.      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)      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      16945   Fri Jun 24 17:16:59 2022 Paco Update ALS XAUX cable in control room [JC, Paco] We took the long BNC cable that ran from ETMX to ETMY and ran it from ETMX      16944   Fri Jun 24 13:29:37 2022 Yehonathan Update General OSEMs from KAGRA The box was given to Juan Gamez (SURF)      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      16942   Thu Jun 23 15:05:01 2022 Water Monitor Update Upgrade Water Bottle Refill 22:05:02 UTC Jordan refilled his water bottle at the water dispenser in the control room.      16941   Wed Jun 22 19:41:13 2022 Koji Update LSC Daily alignment work; POY trouble solved Before the final measurement of the DC values for the transmissions, I aligned the PMC. This made the PMC trans increased from      16940   Wed Jun 22 18:55:31 2022 yuta Update LSC Daily alignment work; POY trouble solved [Koji, Yuta] I found that Yarm cannot be locked      16939   Wed Jun 22 17:04:06 2022 Deeksha Summary Electronics Characterising the AUX control loop [Cici, Deekha] Setup loop to measure transfer function of control loop - the aim is      16938   Wed Jun 22 14:44:03 2022 Anchal Update BHD Fixed DC error in c1su2, added new library model for suspensions The 0x2000 error in c1su2 happens whenever we make it and install it as the default data acquisition rates are too much in the      16937   Tue Jun 21 22:22:37 2022 Tomislav Update ASC Plots In the attachment please find a comparison of error signals of simulation and reality after including air turbulence as input noise.      16935   Tue Jun 21 21:17:16 2022 yuta Update BHD RTS models for BHD added but PCIE error remaining [Anchal, Yuta] RTS models for BHD homodyne phase control (c1hpc)      16934   Tue Jun 21 18:41:46 2022 Tomislav Update ASC Simulation plot In the attachment please find a comparison of error signals of simulation and reality. For C1:IOO-WFS1/2_PIT_IN1 excess signal ('belly')      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      16932   Tue Jun 21 14:17:50 2022 yuta Configuration BHD BHD DCPDs re-routed to c1sus2 After discussing with Anchal, we decided to route BHD related PD signals directly to ADC of c1sus2, which handles our new suspensions      16931   Tue Jun 21 08:36:50 2022 Anchal Update SUS Diagonalized input matrices for LO1, freeSwing on ITMY and ITMX Over the weekend, I ran freeSwing test with sequential kicks in specific DOFs for LO1, ITMY, ITMX. LO1 results were successfully      16930   Mon Jun 20 19:46:04 2022 Tomislav Update ASC Simulation plots In the attachment please find IMC ASC simulation plots. Let me know what you think, if you want some other plots, and if you need any      16929   Fri Jun 17 16:22:21 2022 yuta Update LSC Actuator calibration of BS. ITMX, ITMY, updated MICH displacement spectra from c1cal Following what we have done in 2013 (40m/8242), actuator calibration was done using MICH.  6x    16928   Fri Jun 17 13:07:08 2022 Koji Update BHD Comparison of MICH OLTF model with measurement I'm curious why the actual OLTF included the 60Hz comb...? It is undesirable to have such structure in the OLTF around the UGF      16927   Fri Jun 17 12:05:32 2022 Yehonathan Update BHD Comparison of MICH OLTF model with measurement I should write down what I didn't include for completeness: 1. AA filters      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      16925   Thu Jun 16 18:30:07 2022 Anchal Update SUS New diagonalized input matrices applied I used the same fre swing data to diagnolize input matrices of following optics: MC1, MC2, MC3      16924   Thu Jun 16 18:23:15 2022 Paco Configuration BHD Recovering LO beam in BHD DCPDs [Paco, Yuta] We recovered the LO beam on the BHD port. To do this, we first tried reverting      16923   Thu Jun 16 17:40:15 2022 Yehonathan Update BHD Comparison of MICH OLTF model with measurement I made some progress in modeling MICH loop. Putting all the LSC and SUS filters together with the MICH Finesse model I constructed      16922   Thu Jun 16 15:29:03 2022 yuta Update PSL PMC input beam aligned again, IMC [Paco, Tomislav, Yuta] Somehow, when we were trying to measure

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