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==== Report for week of 3/5 ====
 * Mark finished -v2 of the schedule ([[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7779| L1807779]]).
 * We removed the non-vacuum-compatible ballast mass from the BS tank.
 * We secured all the PR2 feedthrough connections with screws.
 * We grabbed an extra empty rack for SRM and set it up next to the one for SR3 (we will add boxes next week).
 * We calibrated the SR2 SF LVDT sensing and actuation, and the FR.
 * We measured the bounce frequencies of the SF with and without the cap, and the bounce frequency of the BF.
 * We put the SF cap on and lifted and weighed the SF/... section.
 * However we were unhappy with how the cap had to be forced on and off and how it lowered the load capacity (≈-433 g) and resonance frequency (0.271 Hz-> 0.23 Hz).
 * We tried the cap left over from B2-3 used in one of the PRs, which was slightly better but still not great.
 * We measured diameter of the original cap (B2-2) and the new one (B2-3). The original cap was almost exactly 700 mm in internal diameter, and the new one was about 0.2 mm wider.
 * We moved the filter building bench and tools into the SRM area and started the rebuild of the two remaining BFs (the one from the BS Test Hang and the one with the tilted keystone).
 * Mark worked on slides for the ASJ and LVC meetings.
 * The SRM mushroom work was postponed due to other demands on the time of Sawada-san-tachi and Mirapro.

==== Plan for week of 3/12 ====
 * Shoda-san at Mitaka.
 * Mark at ASJ (Chiba) Fri, then Mitaka.
 * Others Kamioka Mon-Thu
 * F2F VIS Meeting and Farewell Party for Fabian at Mitaka on Friday.
 * --
 * Install boxes in SR3 and SRM racks.
 * Lay SR3 in-air cabling.
 * Continue rebuild of BFs.
 * Ship dummy BS to Mitaka.
==== Report for week of 3/12 ====
 * We helped Mirapro close up the BS tank, and did last minute checks and adjustments, including using the fishing rods to reset the GAS keystones to mid-range according to the LVDTs. (The F0 had risen so far (≈7 mm) due to temperature changes that it was touching the upper keystone stop screws and defeating the vibration isolation. We operated the F0 FR manually while the tank lid was off.)
 * We installed electronic boxes in the SR3 and SRM racks. Enzo set the phases and gains on the LVDT drivers for both racks. Rack internal cabling and in-air cabling to SR3 still needs to be done.
 * Hirata-san disassembled two BFs (one SF BF with a tilted keystone and the BS Test Hang BF) and characterized all 10 available SR BF blades. He found they fell into a group of 6 strong ones and a group of 4 weak ones, so he divided the 6 into two matched sets and rebuilt the two filters.
 * We noticed that the bottom level of SR2 suspension had developed a significant yaw (enough to foul on the security structure), probably introduced when we picked the chain up to weigh it, so we lifted the suspension again and corrected it.
 * We aligned the SR2 ready for TFs. We noticed that the IM/... section had a noticeable roll (≈20 mrad) but we were unable to correct it with the IM roll pico (the pico runs but the roll does not change, probably because there is too much friction for the mass return spring). We will see if the TFs look OK and then decide whether to try correcting the roll.
 * We gathered items for OSEM assembly by Enzo, Shoda-san and others at Mitaka next week, and for geophone assembly by Fujii-kun and Kozu-kun at Kamioka. Hirata-san ordered some M8x35 screws that we didn't have enough of.
 * We took delivery of the blade bases for the LBB dampers.
 * Hirata-san packed up two SF caps (the original one from the SR2 SF) and a spare, for remachining by Mirapro. He also packed up the dummy BS and arranged for Ishizaki-san to take it to Mitaka for soaking off of the sapphire prisms.
Line 35: Line 19:
 * Fujii-kun at Kamioka  * Fujii-kun at Kamioka (including Wed 3/21)
 * Kozu-kun at Kamioka Mon-Tue.
Line 38: Line 23:
 * Put four geophones in pods.
 * Make two sets of IM OSEMs
 * Make last in-air pico adapter cable
 * Make three in-air stepper splitter cables for SR2, SR3 and SRM.
 * Set up D
ummy BS prism removal.
 * SR2 TFs and control loop development (Shoda-san and Enzo).
 * Assemble
four geophone pods (Fujii-kun and Kozu-kun at Kamioka).
 * Make two sets of IM OSEMs (Shoda-san and Enzo)
 * Make last in-air pico adapter cable (Enzo).
 * Make three in-air stepper splitter cables for SR2, SR3 and SRM (Enzo).
 * Set up d
ummy BS prism removal (Hirata-san).
Line 50: Line 35:
 * SF Check  * Lay SR3 in-air cabling (Enzo +1).
 * Finish rebuild of second BF (Hirata-san).
 * SF Check (Hirata-san).

Scraps of text for incorporation in the VIS Meeting Minutes

KAGRA/Subgroups/VIS/MeetingNAOJ

Type B (Mark)

Report for week of 3/12

  • We helped Mirapro close up the BS tank, and did last minute checks and adjustments, including using the fishing rods to reset the GAS keystones to mid-range according to the LVDTs. (The F0 had risen so far (≈7 mm) due to temperature changes that it was touching the upper keystone stop screws and defeating the vibration isolation. We operated the F0 FR manually while the tank lid was off.)
  • We installed electronic boxes in the SR3 and SRM racks. Enzo set the phases and gains on the LVDT drivers for both racks. Rack internal cabling and in-air cabling to SR3 still needs to be done.
  • Hirata-san disassembled two BFs (one SF BF with a tilted keystone and the BS Test Hang BF) and characterized all 10 available SR BF blades. He found they fell into a group of 6 strong ones and a group of 4 weak ones, so he divided the 6 into two matched sets and rebuilt the two filters.
  • We noticed that the bottom level of SR2 suspension had developed a significant yaw (enough to foul on the security structure), probably introduced when we picked the chain up to weigh it, so we lifted the suspension again and corrected it.
  • We aligned the SR2 ready for TFs. We noticed that the IM/... section had a noticeable roll (≈20 mrad) but we were unable to correct it with the IM roll pico (the pico runs but the roll does not change, probably because there is too much friction for the mass return spring). We will see if the TFs look OK and then decide whether to try correcting the roll.
  • We gathered items for OSEM assembly by Enzo, Shoda-san and others at Mitaka next week, and for geophone assembly by Fujii-kun and Kozu-kun at Kamioka. Hirata-san ordered some M8x35 screws that we didn't have enough of.
  • We took delivery of the blade bases for the LBB dampers.
  • Hirata-san packed up two SF caps (the original one from the SR2 SF) and a spare, for remachining by Mirapro. He also packed up the dummy BS and arranged for Ishizaki-san to take it to Mitaka for soaking off of the sapphire prisms.

Plan for week of 3/19

  • Fujii-kun and Tanioka-kun join.
  • Mark at LVC meeting
  • Fujii-kun at Kamioka (including Wed 3/21)
  • Kozu-kun at Kamioka Mon-Tue.
  • All others at Mitaka
  • --
  • SR2 TFs and control loop development (Shoda-san and Enzo).
  • Assemble four geophone pods (Fujii-kun and Kozu-kun at Kamioka).
  • Make two sets of IM OSEMs (Shoda-san and Enzo)
  • Make last in-air pico adapter cable (Enzo).
  • Make three in-air stepper splitter cables for SR2, SR3 and SRM (Enzo).
  • Set up dummy BS prism removal (Hirata-san).

Plan for week of 3/26

  • Mark vacation.
  • Shoda-san at Mitaka
  • Others at Kamioka
  • --
  • Lay SR3 in-air cabling (Enzo +1).
  • Finish rebuild of second BF (Hirata-san).
  • SF Check (Hirata-san).
    • Check load capacity.
    • Check fit of caps.
    • Add cable clamps to bases.
    • Add cable clamps and Cu segments to caps (only if they fit well).
    • Cable LVDTs and steppers.

To-Do Lists, Schedule

Vacation Info

  • Mark at LVC, then vacation, 3/18 (Sun) - 4/1 (Sun)
  • Hirata-san vacation, Mon 3/5.
  • Fabian vacation, 3/26-4/27 (then gone).

KAGRA/Subgroups/VIS/TypeB/Minutes (last edited 2022-07-29 13:18:56 by fabian.arellano)