Agenda/Minutes of the VIS Meeting on 2018/3/16

2018/3/16 13:30 -

Participants:

Progress report

Schedule Chart

Type-A : (PDF/MPP)

Type-B: (PDF/MPP)

Type-A (Takahashi)

Past week report

[X-front]

• Cabled between the F3 and F2.
• Tuned the F2. Compressed four blades by 0.5-1.0mm.
• Attached the connector plates onto the cap of F2.
• Closed the cap and hung the F2.
• Tuned the F2 again. Finally the optimal frequency was 0.26Hz.
• Checked the FR in F2. The available range was covering the movable range of keystone.
• Cabled around the F2. Checked the connection.
• Started the assembly of the end plate for F1.

[Manufacturing of maraging blades]

• Maraging steel balk was delivered on 13th.
• Brought the balk to the roll company in Takefu on 15th.
• The rolling will be finished by the end of April.

Plan for coming weeks

[X-front]

• Lift down the F3 into the corrugate tube.
• Extend the EQ stop for F1.

[X-end]

• 3/19: Open the top chamber.
• 3/20: Wire connection with CP.
• 3/21: Cable connection with CP.

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. They still need final adjustment.
• 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.
• 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.
• Blade bases promised for delivery did not show up.

Plan for week of 3/19

• Fujii-kun joins.
• 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

• Tanioka-kun joins.
• Mark vacation.
• Shoda-san at Mitaka
• Others at Kamioka
• --
• Lay SR3 in-air cabling (Enzo++).
• Finish tuning of BFs (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

• KAGRA/Subgroups/VIS/TypeB/March2018

• KAGRA/Subgroups/VIS/TypeB/April2018

• KAGRA/Subgroups/VIS/TypeB/ToDoBS

• KAGRA/Subgroups/VIS/TypeB/ToDoSR

• JGW-L1807779-v1 Type B Schedule (SR)

Vacation Info

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

Type-Bp (Shoda)

Past week report

Plan for coming weeks

OMMT & OSTM (Ohishi)

Past week report

Plan for coming weeks

Watchdog system (Tanaka)

Past week report

• Preparation for assembly of mass products.-->

  • Programming and Unit Testing(30 Items).-->25/30 Items completed.

  • I started to assemble the apparatus.
  • Other necessary preparations.

• There are two casings yet(Adjusting with vendor).-->Delivery completed.

Plan for coming weeks

• I started to assemble the apparatus.-->It is due to be completed on the 19th.

• Final system test -->The exam is scheduled to be completed by 20th.

• I plan to ship to Kamioka on 22nd(For equipment installation from 26th to the week).

Other site works

• 3/15 - Pump down of the center area

Safety

• Incidents:
• Foreseen risks
  • Type-A:
  • Type-B:
  • Type-Bp:

Discussion

Travel Plans

• Travel (Week of 3/19):
  • Takahashi:
  • Okutomi:
  • Sato:
  • Ishizaki:
  • Mark:
  • Fabian:
  • Hirata:
  • Enzo:
  • Shoda:
  • Ohishi:
  • Fujii:
  • Tanaka:
  • Kozu (ICRR):
  • Arai (ICRR):
• Travel (Week of 3/26):
  • Takahashi:
  • Okutomi:
  • Sato:
  • Ishizaki:
  • Mark:
  • Fabian:
  • Hirata:
  • Enzo:
  • Shoda:
  • Ohishi:
  • Fujii:
  • Tanaka:
  • Kozu (ICRR):
  • Arai (ICRR):

Next meeting

On 2018/3/23(Fri)