• KAGRA
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• VISMinutes20180223

Agenda/Minutes of the VIS Meeting on 2018/2/16

2018/2/23 13:30 -

Participants:

Progress report

Schedule Chart

Type-A : (PDF/MPP)

Type-B: (PDF/MPP)

Type-A (Takahashi)

Past week report

[X-front]

• Attached the additional FR blade to the BF.
• Needed some try and errors due to some problems (low Q, FR range, height of blade).
• Tuned the BF again. Optimal load was 197.1kg at 0.31Hz. The FR range was 7.5mm.
• Closed the cap of BF.
• Extended the EQ stop to the F3 stage.
• Lifted down the DP into the corrugate tube.
• Set the F3 onto the end plate. maraging wire was hooked to the receptacles.
• Tuned the F3 to 0.31Hz initially.
• The optimal load was changed by closing the cap and hunging the F3.
• Finally the frequency was 0.27Hz reducing the weight by 0.4kg.
• Checked the range of FR in F3. It was 13.5mm.
• Calibrated the LVDT in F3.
• Started cabling between the BF and the F3.

Plan for coming weeks

[Next week]

• Finish the cabling between the BF and the F3.
• Lift down the BF into the corrugate tube.
• Go to the F2 stage.

[Week of March 5]

• Vent the EXV chamber on 5th.
• Remove the IXV DP on 6th.
• Insert the maraging wire for Cryo-payload with cables.

Type B (Mark)

Report for week of 2/19

• We did TFs from the IM OSEMs.
• We secured the cables inside the BF, added the cap and anchored the cables from below the BF to the cap.
• We lifted the BF/... section with the load gauge adapter and measured the weight, which was about as expected.
• Based on the measured weight, Fabian prepared an 800 g set of masses for the top of the BF.
• We added the AF crossbars and the section of the SS below the SF and craned in the SF.
• We installed the SF-BF rod and flying saucer and suspended the BF/... section. With the 800 g placed temporarily on the BF, the SF keystone floated at about mid-range.

Plan for week of 2/26

• Shoda-san at Mitaka.
• -
• Enzo at Mitaka Mon 2/26.

• Remove LBB temporary ballast masses from BS chamber.

• Route cables up to under SF.
• Check/adjust total mass and balance of BF/... section, especially IM OSEMs.
• Cable and calibrate SF LVDT.
• Add Cu segments to SF cap.
• Install cap.
• Lift SF/... section and check total mass and balance.

Plan for week of 3/5

• Shoda-san at Mitaka.
• Hirata-san vacation Mon 3/5, then Kamioka
• Others at Kamioka.
• -
• Get SRM tank mushroom section installed (Hirata-san, Kimura-san)
• SR3 rack setup.
• Other tasks TBD.

Plan for week of 3/12

• Shoda-san at Mitaka.
• Mark at ASJ (Chiba) Fri 3/16.
• Hirata-san vacation Mon 3/5, then Kamioka

Plan for week of 3/19

• Mark at LVC meeting
• Shoda-san, Fabian at Mitaka

Plan for week of 3/26

• Mark vacation.
• Others ???

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

• Enzo Mitaka day 2/26
• Hirata-san vacation 3/5
• Hirata-san vacation Mon 3/5
• Fabian 3/26-4/27 vacation (then gone).

Type-Bp (Shoda)

Past week report

Plan for coming weeks

OMMT & OSTM (Ohishi)

Past week report

• OSEM test
• Removed a magnet from OSEM and measured response.
  • It seemed that PD or LED inside OSEM has weak magnetic feature.

Plan for coming weeks

Watchdog system (Tanaka)

Past week report

• Preparation for assembly of mass products.-->Ongoing.

• Adjustment and approval to vendors(Implementation adjustments and approvals for circuit boards.)-->

  • There is no delivery.-->Contacting the vendor.

Plan for coming weeks

• Preparation for assembly of mass products.
• Adjustment and approval to vendors(Implementation adjustments and approvals for circuit boards.)

Other site works

• 2/26 - 3/9 Construction of the walls to isolate the arms better (for cleanliness)
• 3/12 - 3/16 Installation of the control systems for the large GVs
• 3/12 - Center area: preparation for pump down: connecting ducts.

Safety

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

Discussion

• Center area pump down
• PR2/3 height adjustment

Travel Plans

• Travel (Week of 2/26):
  • Takahashi: 26 -2
  • Okutomi: 26 -2
  • Sato: 26 -1
  • Ishizaki: 26 -1
  • Mark: 26 -2
  • Fabian: 26 -2

  • Hirata:26 -2

  • Enzo:27 -2

  • Shoda:
  • Ohishi:
  • Fujii:
  • Tanaka:
  • Kozu (ICRR): 26 -2
  • Arai (ICRR):
• Travel (Week of 3/5):
  • Takahashi: 5 - 9
  • Okutomi: 5 - 9
  • Sato: 5 - 9
  • Ishizaki: 5 - 9
  • Mark: 5 - 9
  • Fabian: 5 - 9
  • Hirata: 6 - 9
  • Enzo: 5 - 9
  • Shoda:
  • Ohishi:
  • Fujii:
  • Tanaka:
  • Kozu (ICRR): 5 - 9
  • Arai (ICRR):

Next meeting

On 2018/3/2(Fri)

VIS Meeting in Mitaka: 3/16