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

2018/2/2 13:30 - 14:40

Participants: Mark, Takahashi, Sato, Aso, Hirata, Tanaka, Fabian, Shoda, Ishizaki, Suzuki

Progress report

Schedule Chart

Type-A : (PDF/MPP)

Type-B: (PDF,MPP)

• Type-A: 0.5 week delay expected for BF
• Type-B:

Type-A (Takahashi)

Past week report

[X-front]

• Assembled the side stoppers for DP and BF.
• Assembled the LVDT coils for BF damper. The primary coils were attached on the cup.
• Measured the weight of BF (105 kg).
• Put the BF base onto the end plate and hooked the test wire to the receptacle.
• Tuned the BF with additional compression (load 190.4kg, frequency 0.3Hz).

  • Check with CRY if 190kg is OK for CRY payload (Takahashi)

• Checked the range of FR in the BF. The range was larger than the movable limit of keystone.
• Checked the blades on TFs. There were not any cracks on the surface of the blades.

[Y-end]

• Release the support jack for the top chamber. The height of chamber was decreased by 2mm.
• Removed the NIM chassis from the rack.

Plan for coming weeks

• Open the top chamber and the cross tube.
• Install the DP and the BF into the chamber.

Type B (Mark)

Report for week of 1/29

• We moved the top filter intended for SR2 (#1) into the SR3 cleanbooth.

• Unfortunately we noticed one of the blades had many small X-shaped stress fractures on the top surface (klog 4058).

• We moved the top filter entered for SR3 (#3) into the SRM cleanbooth and inspected the blades. Two had one smallish stress fracture each and one had a huge fracture and looks close to failing (klog 4061).

• We referred the BS OL.

• We removed the BS tank lid and inspected the BS top filter blades. They seemed fine (klog 4073).

• Hirata-san received and washed some ferromagnetic disks for IM flags and other small parts.
• Hirata-san moved the BF with the tilted keystone (#1) out of the cleanbooth in preparation for rebuilding.
• Hirata-san placed the second order for payload parts, and an order for remachining of nuts for cable clamps on rods.
• Fabian measured the gain of the ADC system (homework from the Commissioning Workshop).
• Shoda-san revised the BS real-time model (and Izumi-san fixed a few compile errors and installed it).

Plan for week of 2/5

• Enzo on vacation; all others at Kamioka.
• -
• Make in-air pico adapter cables.
• Calibrate LVDT.
• Test IM picos and BF yaw pico.
• Test FR.
• Install ballast mass in BF.
• Build IRM around IM.

Plan for week of 2/13

• No work Monday (建国記念の日の振替休日)
  

• Enzo on vacation
• Hirata-san at Mitaka Tue, Wed (to receive and wash parts).
• All others at Kamioka.
• -
• Cable/test/adjust IM OSEMs.
• Do TFs from IM OSEMs to IM OSEMs, OL pitch/yaw.

Plan for week of 2/19

• Lift BF/... section and check total mass and balance.
• Cable and test BF picos.
• Add section of SS up to SF ring.
• Bring in SF.
• Add Cu segments to SF cap.
• Hook BF/... section.
• Route cables up to under SF.
• Check/adjust total mass of BF/... section.

Vacation Info

• Enzo 1/30-2/19 (at Mitaka 1/29, part of 1/30).
• Fabian 4/2-4/27 vacation (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. --> Ongoing.

*Adjustment and approval to vendors(Meeting on machine design etc). --> Completed.

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

• Feb 18: Black out of the Mozumi buildings

Safety

• Incidents: no incident
• Foreseen risks
  • Type-A: Crane work
  • Type-B: Crane work
  • Type-Bp:

Discussion

• Fragile blades

  • All the SR TF blades are bad -> we will replace them

  • BS and ITM TF blades seem to be OK (no crack found)

    • Takahashi will ask G&M the history of those blades (is there any difference between the SR blades and others ?)

  • For ITM TF, we do not have enough number of blades from the beginning. We need at least 3 more blades.
  • We will make the following numbers of blades:
    • SR: 15 (9 necessary)
    • BS: 6 (3 necessary if we replace them)
    • Type-A: 6 (3 necessary)
• How to safely take out the damaged blades from the TFs ?
  • We need to wear protective gear (Aso will look for them)
  • We will clamp the blade (using C-clamps) to the jig around the large crack to prevent sudden break. Hirata will select suitable C-clamps.
  • Once the blades are moved to the work bench, we will cover everything in a plastic box before releasing the stress.

Travel Plans

• Travel (Week of 2/5):
  • Takahashi: 7-9
  • Okutomi: 5 - 9
  • Sato: 6-9
  • Ishizaki: 7-9
  • Mark: 5-9
  • Fabian: 5-9
  • Hirata: 5-9
  • Enzo:
  • Shoda:
  • Ohishi:
  • Fujii:
  • Tanaka:
  • Kozu (ICRR): 5-9
  • Arai (ICRR):
• Travel (Week of 2/12):
  • Takahashi: 13-16
  • Okutomi: 13-16
  • Sato: 13-16
  • Ishizaki: 13-16
  • Mark: 13-16
  • Fabian: 13-16
  • Hirata: 15-16
  • Enzo:
  • Shoda:
  • Ohishi:
  • Fujii:
  • Tanaka:
  • Kozu (ICRR): 13-16
  • Arai (ICRR):

Next meeting

On 2018/2/9(Fri)