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==== Report for week of 11/12 ====
 * BS
  * Kozu-kun noticed the BS OL was out of range, and Fabian and Fujii-kun investigated. It turns out that the temperature has risen by over 2°C, so all the GAS filters have sagged and several stages are touching. Miyoki-san and Furuta-san are looking at what can be done.
  * We ordered three more geophone cables in the standard (non-flipped pinout) to save time during the December vent, where we will replace at least two of the preamps to fix issues and take the opportunity to put in non-flipped ones.
==== Report for week of 11/19 ====
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  * We cabled all the SF/... through to the rack and checked that all items worked.
  * We did the vertical height survey and found that as with SR2 and SR3, the chain is longer than the CAD, this time by ≈7 mm, and again mostly between the SF and BF. We decided on a keystone height of 11.5 mm (5 mm higher than CAD), which can be achieved with 1 kg more on the SF and 1 kg in reserve for a yaw stepper mechanism. We reset the height of the yoke to give near-zero LVDT output for the new nominal height, and corrected the sensing and actuation signs, but still need to do the calibration.
  * The final SRM small glass mirror became available, so we had Hirose-san ship it to us so we can install it while the suspension is still on the assembly frame. Hirata-san ordered shims to make up the new recommended thickness of 1.4 mm and a micrometer to check the combination, which should arrive on Monday 11/26.
  * Enzo took calibration data for the last batch of geophones, for SRM. We had to borrow cables from SR2 because one cable was missing and another was miswired. And it turned out that one of the SR2 cables was defective as well. But if we can find two possibly borrowed by Okutomi-san and rewire one, we should have enough for SR2 and SRM. The geophones appear to be healthy and we will seal them next week.
  * We raised the PI clear of the assembly frame and unlocked and centered the IP. We calibrated the IP LVDTs, and reversed connections to get positive LVDT output for positive yaw. We borrowed a HPCD from SR3-IM-V for the SRM IP but haven't checked the actuation yet.
  
  * We locked the suspension and craned it into the tank. This is the last Type B tank installation!
  * While inspecting the O-ring between the service ring and the lower section of the tank, Hirata-san found a small nick, so he replaced it. (This will hopefully be the last time that flange is closed, so it needs to be left ready for Mirapro to tighten.)
  * Hirata-san and Fabian removed the First Contact, but found that a tiny piece was left behind. With advice from Hirose-san, they managed to remove it via several rounds of dabbing with an acetone-soaked lens tissue.
  * They removed the IM-RM safety bar, unlocked the lower half of the suspension, and got it reasonably well aligned by eye.
  * They moved the vacuum feedthroughs and in-air cabling over, and reconnected nearly all the electronics. (The in-air cabling will need some tidying later, but
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  * While we were grabbing geophone cables from SR2, we added extra arc weights to get the IP frequency below 0.1 Hz.
  * Akutsu-san showed us how to install the OL transmitter support pillar, receiver shelf and viewports. We believe we have the parts to finish setting up the SR2 OL.
 
  * Enzo and Mark set up the the SR2 OL. We may need to steal the LED back temporarily to do pitch setting on SRM, but we can take some interesting TFs on SR2 over the weekend.
 * SR3
  * Enzo configured a new stepper driver for SR3_IP and returned the one that had been borrowed from SRM. (The original SR3_IP had been used to replace a water-damaged unit on the BS.)
  * Enzo worked on diagonalizing the IP and modeling of the whole suspension. He created Foton filters representing the response of the system in slots FM6-8 of the various filter banks.
 * Etc
  * Mark got three more MPCDs (M = "medium" or "modified") from AEL and moved coil drivers around until all Type B suspensions had a driver in every position, with MPCDs for IM-H and HPCDs everywhere else. He returned the unused LPCDs.
  * Mark did an inventory of all the Type B electronics and got the various JGW Doc electronic items lists up to date - see [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7276|E1707276]]. This included opening all the LVDT drivers to check that they had the original cards - BS, SR3 and SRM did, but SR2 had both input cards new. We let AEL know.
  * Hirata-san helped Furuta-san with floor repair.
  * Fabian changed the PR3 thermometer battery.
  * Mirapro installed a bellows on the -Y side of SR3.
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==== Plan for week of 11/26 ====
 * SRM
  * Clean tools and metal parts for final SRM glass mass.
  * Swap in final glass mass.
  * Adjust SF trim mass.
  * Check/adjust alignment of SS.
  * Calibrate IP LVDTs.
  * Add arc weights and geophones.
  * Improve centering/tuning of IP and SS alignment.
  * Disconnect cables at feedthroughs, lock suspension.
  * Crane into tank.
 * SR2
  * Finish OL setup
  * TFs.
  * Control loops.
==== Plan for week of 12/17 ====
 * Final alignment of SRM payload, plus BF and SF GAS.
 * (Time permitting) unlocking/centering/tuning of IP.
 * Installation of Enomoto-kun's beam target on SRM (if available).
 * Installation/testing of F0 steppers on SR2, SR3, SRM, and (hopefully) final vertical height adjustment.
 * Installation of viewports on SRM.
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==== Plan for week of 12/3 ====
 * f2f Meeting at NAOJ - no Kamioka work.
==== Plan for week of 12/10 ====
 * Prepare for vent of BS.
 * BS work - see [[KAGRA/Subgroups/VIS/TypeB/ToDoBS]].
==== Plan for week of 12/24 ====
 * Most of team on holidays - no Kamioka work.
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==== Vacation/Event Info ====
 * Hirata-san at Mitaka, Fri 11/30 (medical check for solvent use).
 * Enzo at Mitaka, Fri 11/30 (Mitaka day).
==== Vacation/Etc Info ====
 * Mark: 12/24 - 1/4.
 * Hirata-san: 12/24 - 1/4.
 * Fabian: TBD but similar.
 * Enzo: TBD but similar.
 * Mark and Enzo: KAGRA International Workshop in Perugia, 2/14-16.

Scraps of text for incorporation in the VIS Meeting Minutes

KAGRA/Subgroups/VIS/MeetingNAOJ

Type B (Mark)

Report for week of 11/19

  • SRM
    • We locked the suspension and craned it into the tank. This is the last Type B tank installation!
    • While inspecting the O-ring between the service ring and the lower section of the tank, Hirata-san found a small nick, so he replaced it. (This will hopefully be the last time that flange is closed, so it needs to be left ready for Mirapro to tighten.)
    • Hirata-san and Fabian removed the First Contact, but found that a tiny piece was left behind. With advice from Hirose-san, they managed to remove it via several rounds of dabbing with an acetone-soaked lens tissue.
    • They removed the IM-RM safety bar, unlocked the lower half of the suspension, and got it reasonably well aligned by eye.
    • They moved the vacuum feedthroughs and in-air cabling over, and reconnected nearly all the electronics. (The in-air cabling will need some tidying later, but
  • SR2
    • Enzo and Mark set up the the SR2 OL. We may need to steal the LED back temporarily to do pitch setting on SRM, but we can take some interesting TFs on SR2 over the weekend.
  • SR3
    • Enzo configured a new stepper driver for SR3_IP and returned the one that had been borrowed from SRM. (The original SR3_IP had been used to replace a water-damaged unit on the BS.)
    • Enzo worked on diagonalizing the IP and modeling of the whole suspension. He created Foton filters representing the response of the system in slots FM6-8 of the various filter banks.
  • Etc
    • Mark got three more MPCDs (M = "medium" or "modified") from AEL and moved coil drivers around until all Type B suspensions had a driver in every position, with MPCDs for IM-H and HPCDs everywhere else. He returned the unused LPCDs.
    • Mark did an inventory of all the Type B electronics and got the various JGW Doc electronic items lists up to date - see E1707276. This included opening all the LVDT drivers to check that they had the original cards - BS, SR3 and SRM did, but SR2 had both input cards new. We let AEL know.

    • Hirata-san helped Furuta-san with floor repair.
    • Fabian changed the PR3 thermometer battery.
    • Mirapro installed a bellows on the -Y side of SR3.

To-Do Lists, Schedule

Plan for week of 12/17

  • Final alignment of SRM payload, plus BF and SF GAS.
  • (Time permitting) unlocking/centering/tuning of IP.
  • Installation of Enomoto-kun's beam target on SRM (if available).
  • Installation/testing of F0 steppers on SR2, SR3, SRM, and (hopefully) final vertical height adjustment.
  • Installation of viewports on SRM.

Plan for week of 12/24

  • Most of team on holidays - no Kamioka work.

Vacation/Etc Info

  • Mark: 12/24 - 1/4.
  • Hirata-san: 12/24 - 1/4.
  • Fabian: TBD but similar.
  • Enzo: TBD but similar.
  • Mark and Enzo: KAGRA International Workshop in Perugia, 2/14-16.

KAGRA/Subgroups/VIS/TypeB/Minutes (last edited 2022-04-22 13:34:51 by fabian.arellano)