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ID Date Author Type Category Subject Text   16862   Wed May 18 09:02:52 2022 Anchal Update BHD WFS1 PD centered I centered WFS1 PD so that IMC WFS Servo does not go out of range.        16861   Wed May 18 08:30:29 2022 Paco Update BHD SRM OpLev [Paco] The SRM Oplev injection and detection paths interfere heavily with the POY11. Due      16860   Tue May 17 18:43:38 2022 Anchal Update BHD Placed SRM in ITMY Chamber [Anchal, Paco, Yuta] SRM Placement SRM was moved from its parked location to the      16859   Mon May 16 19:14:17 2022 Anchal Update BHD Camera set on AS path and BHDBS output path [Anchal, Paco, Yuta] We aligned AS path avoiding any clipping to the AP table where we setup      16858   Mon May 16 16:13:01 2022 Yehonathan Update BHD Initial BHD modeling: Damped suspension model I was finally able to set up a stable suspension model with the help of Yuta and I'm now ready to start doing some MICH noise      16857   Mon May 16 14:46:35 2022 Tommy Update Electronics RFSoC MTS Work We followed the manual's guide for setting up MTS to sync on external signal. In the xrfdc package, we update the RFdc      16856   Mon May 16 13:22:59 2022 yuta Update BHD REFL and AS paths aligned at AP table After Xarm and Yarm were aligned by Anchal et al, I aligned AS and REFL path in the AP table.      16855   Mon May 16 12:59:27 2022 Chris Update DAQ DAQ troubleshooting It looks like the RFM problem started a little after 2am on Saturday morning (attachment 1). It’s subsequent to what I did,      16854   Mon May 16 10:49:01 2022 Anchal Update DAQ DAQ troubleshooting [Anchal, Paco, JC] Thanks Chris for the fix. We are able to access the testpoints now but we      16853   Sat May 14 08:36:03 2022 Chris Update DAQ DAQ troubleshooting I heard a rumor about a DAQ problem at the 40m. To investigate, I tried retrieving      16852   Fri May 13 18:42:13 2022 Paco Update Alignment ITMX and ITMY sat amp failures [Yuta, Anchal, Paco] As described briefly by JC, there were multiple failure modes going during      16851   Fri May 13 14:26:00 2022 JC Update Alignment LO2 Beam [Yehonathan, JC] Yehonathan and I attempted to align the LO2 beam today through the BS chamber      16850   Thu May 12 20:24:29 2022 yuta Update BHD POX and POY investigation [Anchal, Yuta] We checked POX and POY RF signal chains      16849   Thu May 12 20:11:18 2022 Anchal Update BHD BHDBS Output beams steered out to ITMY table I successfully steered out the two output beams from BHD BS to ITMY table today. This required significant changes on the table,      16848   Thu May 12 19:55:01 2022 Tega Update BHD AS path alignment [Yuta, Tega] We finally managed to steer the AS beam from ITMY chamber, through BS and      16847   Thu May 12 17:20:08 2022 Paco Update Alignment POP Beam on CCD [Paco] Got POP beam centered on camera and nominally on the two PDs. Attachment      16846   Thu May 12 13:46:59 2022 Jc Update Alignment POP Beam [Tega, JC] Tega and I went in to adjust the POP being in the ITMX Table. The beam entered      16845   Wed May 11 15:49:42 2022 JC Update OPLEV Tables Green Beam OPLEV Alignment [Paco, JC] Paco and I began aligning the Green Beam in the BS Oplev Table. while aligning      16844   Tue May 10 18:25:43 2022 Paco Update BHD Green Transmission path [Yuta, Paco] We installed GRX_SM1, GRX_SM2, and finished aligning      16843   Tue May 10 16:31:14 2022 Tega Update BHD ITMX optlev return beam steered to QPD Followed the steps below to complete the ITMX optlev installation. The ITMX optlev return beam now reaches its QPD without being      16842   Tue May 10 15:46:38 2022 JC Update BHD Relocate green TRX and TRY components from PSL table to BS table [JC, Tega] Tega and I cleaned up the BS OPLEV Table and took out a couple of mirrors and      16840   Mon May 9 23:18:44 2022 Koji Update BHD BHD Platform Progress status I quickly ran the FEA model to check the resonant freqs of the BHD platform. The boundary conditions were:  6x    16839   Mon May 9 22:19:06 2022 Koji Update BHD BHD Platform Progress status [Don, Koji] Don is working on finalizing the BHD Platform design. All the components on      16838   Mon May 9 18:49:05 2022 Tega Update BHD Relocate green TRX and TRY PDs/cams/optics from PSL table to BS table [Paco, Tega] Started work on the relocating the green transmission optics, cameras and      16837   Mon May 9 18:43:03 2022 Anchal Update BHD ITMX table layout corrected As I went to correct the ITMX Oplev mirrors, I found that both mirrors were placed in very different positions than the design      16836   Mon May 9 15:32:14 2022 Ian MacMillan Summary Computers Quantization Noise Calculation Summary I made the first pass at a tool to measure the quantization noise of specific filters in the 40m system. The code for which can      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      16834   Thu May 5 17:50:48 2022 Yehonathan Update BHD BHD Readout simulation I have made a Simulink diagram to use in the MICH modeling (attachment) for the homodyne angle detection scheme. The model will be      16833   Thu May 5 17:05:31 2022 Tega Update BHD IMC & X/Y-arm alignment [Yuta, Tega] In order to setup POP camera and RFPD on the ITMX table, we decided to first      16832   Thu May 5 14:46:22 2022 Anchal Update BHD POP beam height lowered, POP_SM4 raised [Anchal, JC] We first aligned the single arm cavity resonance for both arms to get maximum      16831   Wed May 4 18:52:43 2022 Tega Update BHD POP beam too high at POP SM4 on the ITMX chamber [Yuta, Tega] We needed to sort out the POXDC signal so we could work on X-arm alignment.      16830   Wed May 4 15:08:59 2022 Tega Update BHD XARM alignment to get flashing [Yuta, Tega] We aligned the BS, ITMY, and ETMY PIT and YAW to get the flashing on X-arm      16829   Wed May 4 13:09:42 2022 Anchal Update BHD IMC table balanced again, IMC is locking, YARM is locking [Paco, JC, Anchal] We balanced the IMC table back again to point that got us 50% of nominal      16828   Tue May 3 21:07:17 2022 Yehonathan Update BHD BHD Readout simulation I feel like there is an instability in my thought process on this. Before my tendency to try to scale and generalize this problem      16827   Tue May 3 21:05:23 2022 yuta Update BHD AS path alignment, removing a lot of green stuff [Tega, Yehonathan, Koji, Yuta] We tried to align AS path this afternoon.  7x    16826   Tue May 3 14:02:09 2022 Anchal Summary BHD Installed POP path in ITMX Chamber [Anchal, JC] I installed POP_SM4 and POP_SM5 in the ITMX chamber in the nominal positions.      16825   Tue May 3 13:18:47 2022 JC Update VAC RGA Pump Down Jordan, Tega, JC Issue has been resolved. Breaker on RP1 was tripped so the RP1 button was      16824   Mon May 2 17:51:30 2022 Anchal Update BHD POX Beam aligned on RFPD, YARM locked [Paco, Anchal] We found that one of the Y1-1037-45P marked mirror that we used was actually curved.      16823   Mon May 2 13:30:52 2022 JC Update Coil Drivers Coil Drivers Update The DCC has been updated, along with the modified schematic. Links have been attached.      16822   Mon May 2 10:00:34 2022 Jordan Update VAC TP3 Forepump tip seal replacement [JC, Jordan] Jordan recieved the new tip seal Friday afternoon and I continued the replacement      16821   Sat Apr 30 13:29:33 2022 Paco Update BHD POX Beam issues --- fixed, ASL alignment on vertex chamber [Paco, Anchal, Yuta] We opened the BSC and ITMX chamber in the morning (Friday) to investigate POX11      16820   Fri Apr 29 08:34:40 2022 JC Update VAC RGA Pump Down Jordan and I, in order to start pumpig down the RGA Volume, we began by opening V7 and VM. Afterwards, we started RP1 and      16819   Thu Apr 28 18:07:04 2022 Anchal Update BHD Restoring arm alignment at EOD Restored arm algiment to get 0.8 max flashing on YARM and 1 max flashing on XARM. I had to move input alignment using TT2-PR3 pair      16818   Thu Apr 28 17:45:53 2022 Anchal Update BHD POX Beam issues [Anchal, Paco] We investigated the low power issue with POX11 photodiode.      16817   Thu Apr 28 11:53:10 2022 Anchal Summary BHD POP_SM4 and POP_SM5 Assembly POP_SM4 I tried out this stack today and found some change of plans.      16816   Thu Apr 28 09:12:18 2022 Anchal Update BHD Restoring arm alignment This would be a daily first task in the morning. We'll need to check the status of arm alignment and optimize it back to      16815   Wed Apr 27 16:28:57 2022 Anchal Summary BHD BHD Upgrade - Retreiving arm cavity alignment [Anchal, Paco, JC] We had to open ITMY, ETMY chamber doors to get the cavity aligned again. Once      16814   Wed Apr 27 10:05:55 2022 JC Update Coil Drivers Coil Drivers Update 18 (9 pairs) Coil Drivers have been modified. Namely ETMX/ITMX/ITMY/BS/PRM/SRM/MC1/MC2/MC3.        16813   Tue Apr 26 16:23:22 2022 Tommy Update Electronics RFSoC2x2 MTS We connected a 8 MHz signal generator to the device in order to sync up the ADCs and DACs and hopefully get phase data.       16812   Mon Apr 25 18:00:03 2022 Ian MacMillan Update Upgrade Cable supports update I have designed new cable supports for the new ribbon cables running up the side of the tables in the vacuum chambers.

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