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==== Report for the week of 2/25 ==== ==== Report for the week of 3/4 ====
 * On Monday, Mark helped Aso-san with PR3, and Monday, Tuesday and Wednesday, Fabian helped Fujii-kun with PRM.
 * Mark and Terrence attempted to offload some BS IM/IRM yaw adjustments that had been done by Enomoto-san last Friday. They rezeroed the OL and then opened the tank lid and did a compensating adjustment to the F0 yaw stepper, then undid the IM/IRM yaw with the pico. However this did not have the desired effect, probably because the buoyancy correction had not been cancelled when Enomoto-san was working and the BF keystone was very high, with the IM-V OSEMs way too far in and possibly touching. We did our best to back out all the adjustments but the roll TFs were still messy and there were signs that the IM was not free in yaw (the IM/IRM Y varied oppositely to IP Y, indicating that the IMR was free and the IM wasn't). We ended up deciding to have Mirapro remove the ducts on the ±X sides of the tank so we could go in and inspect.
 * Terrence tuned the SR3 LEN OL to be free of yaw cross-coupling.
 * Terrence and Enzo did a full set of filters and a Guardian for SR2 and SR3.
 * Terrence did health checks on SR2 and SR3.
 * Enzo measured mode Qs.
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 * Fabian monitored suspensions during the vent.
 * Terrence and Mark made lots of changes to the Guardians and RTMs:
  * Added UI to take snapshots with ALIGNED/MISALIGNED channels (for late use by Guardian).
  * Changed "IM1" and "IM2" in channel names to "IMV" and "IMH"; also "DIO" and "BO" -> "BIO".
  * Created library blocks for BIO and made all the Type B models use them.
  * Tweaked the control topology to be more LIGO-style: the error signal for DC control is sensor-setpoint (not setpoint-sensor as in many controls textbooks); the input to the damping block is the uninverted sensor signal(s); there is a hard-wired -1 after the damping block representing default negative gain.
 * Fabian went inside the SRM chamber and diagnosed the problem that had appeared shortly before vent. It turned out to be yaw of the IP causing a payload cable to touch. He fixed it with the F0 yaw stepper. (He had tried this earlier without success but it turned out the problem was another dead output on the stepper driver.)
 * Terrence traced the geophone issue to a group of dead channels (#20-23) on the AA chassis. We tried replacing the chassis and it fixed not only the geophone issue but an issue in the TILT OL path (#24-27) that we had planned to debug next.
 * We retested the BIO for stepper remote enable system and this time it was working (probably due to the refactoring of the BIO stuff in the model and/or all the restarts).
 * We rebuilt all the IOP models after removing an unneeded ADC1 block (corresponding to hardware that Yoshizawa-san had removed).
 * Enzo and Terrence wrote Python scripts to automate the process of adapting the control filters to the new topology (where the DAMP and DCCTRL functions are in parallel instead of series).
==== Plan for week of 3/4 ====
 * Enzo at Mitaka.
 * Mark, Fabian Mon-Wed (Thu is farewell party).
 * Final tweaks of SRM?
 * Monitor (re-)pumpdown.
 * Tests of new Guardian.
==== Plan for week of 3/11 =====
 * Mark at Kamioka full week.
 * Enzo at Kamioka Mon, Tue, then JPS.
 * Hirata-san at Kamioka from Monday lunchtime through Friday.
 * Fix BS.
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 * Install/test hardware watchdogs.
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 * Setup SRM and SR3 LEN OLs.  * More mode Q measurements.
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==== Plan for week of 3/11 =====
 * Mark at Kamioka full week?
 * Enzo at Kamioka Mon, Tue, then JPS.
 *
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 * Enzo vacation, 3/5 and 3/6.
 * Enzo et al. Farewell Party, 3/7.

Scraps of text for incorporation in the VIS Meeting Minutes

KAGRA/Subgroups/VIS/MeetingNAOJ

Type B (Mark)

Report for the week of 3/4

  • On Monday, Mark helped Aso-san with PR3, and Monday, Tuesday and Wednesday, Fabian helped Fujii-kun with PRM.
  • Mark and Terrence attempted to offload some BS IM/IRM yaw adjustments that had been done by Enomoto-san last Friday. They rezeroed the OL and then opened the tank lid and did a compensating adjustment to the F0 yaw stepper, then undid the IM/IRM yaw with the pico. However this did not have the desired effect, probably because the buoyancy correction had not been cancelled when Enomoto-san was working and the BF keystone was very high, with the IM-V OSEMs way too far in and possibly touching. We did our best to back out all the adjustments but the roll TFs were still messy and there were signs that the IM was not free in yaw (the IM/IRM Y varied oppositely to IP Y, indicating that the IMR was free and the IM wasn't). We ended up deciding to have Mirapro remove the ducts on the ±X sides of the tank so we could go in and inspect.
  • Terrence tuned the SR3 LEN OL to be free of yaw cross-coupling.
  • Terrence and Enzo did a full set of filters and a Guardian for SR2 and SR3.
  • Terrence did health checks on SR2 and SR3.
  • Enzo measured mode Qs.

==== Plan for week of 3/11 =====

  • Mark at Kamioka full week.
  • Enzo at Kamioka Mon, Tue, then JPS.
  • Hirata-san at Kamioka from Monday lunchtime through Friday.
  • Fix BS.
  • Final test of stepper remote enable system (someone in cleanroom checks the lights go on/off).
  • Install/test hardware watchdogs.
  • Continue monitoring SRM yaw drift.
  • More mode Q measurements.
  • Work on Type B paper.

Vacation/Travel Info

  • Enzo at JPS then final vacation, 3/13-29
  • Terrence's last day, 3/29.

KAGRA/Subgroups/VIS/TypeB/Minutes (last edited 2022-07-01 13:49:37 by fabian.arellano)