Agenda/Minutes of the VIS Meeting on 2018/2/9

2018/2/9 13:30 - 15:00

Participants: Mark, Hirata, Fabian, Izhizaki, Aso, Takahashi, Ohishi, Shoda, Tanaka, Sato, Okutomi, Akutsu

Progress report

Schedule Chart

Type-A : (PDF/MPP)

Type-B: (PDF/MPP)

Type-A (Takahashi)

Past week report

[X-front]

• The delivery of the maraging rod was deley. We didn't go to hunging by the short rod.
• Attached magnets to the primary coils and made interconnect cables.
• Installed the protection net into the cross tube.
• Opened the top chamber.
• Installed the frame lock.
• Attached the corn bellows onto the bottom of top chamber.
• Assembling the side stoppers for SFs.
• The optimal load of BF (190kg) is not acceptable for the cryo-payload. Designing an additional FR.

[X-end]

• Attached the additional vacuum gauge to the top chamber. The pressure was 0.16Pa.
• Checked the connection for LVDT on the F0-BF.

[Y-end]

• The position of IP was corrected so that the torsion mode frequency can be the lowest.
• Started the cool down of EYC cryostat on 7th.

[Broken blades]

• Franco reported about the sample of broken blades. The sample has two different zones.
• Checked dimensions of some blades. The width was the same, but the thickness was different.
• Dismounted the blade for SRM from the arc jig.
• Nikhef can investigate the broken blade too.
• No information from the maker.
• Asking the companies about the optimal thickness as material for new blades.

Plan for coming weeks

• Hung the DP by the short rod.
• Attached the additional FR and tune the BF again.

Type B (Mark)

Report for week of 1/29

• Mark made two sets of in-air pico splitter cables (each with a triple for IM and a double for BF) for SR2 and SR3.
• Fabian, Hirata-san and Kozu-kun worked on cabling and testing the IM pitch/roll/yaw picos, the BF FR and the BF LVDT. The LVDT connections were initially unreliable and Hirata-san had to redo the pins on the coil wires.
• Fabian installed ballast masses in the BF.
• Mark worked on schedule.
• Mark did inventory of the stepper motor drivers (many were not accounted for on the wiki and/or JGWDoc and one is missing) and reserved two for SR3.
• We emptied out the external cleanroom in preparation for installing SS sheet.

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 (self-evaluation interview).
• Shoda-san at Mitaka.
• All others at Kamioka.
• -
• Build IRM around IM.
• Cable/test/adjust IM OSEMs.
• Do TFs from IM OSEMs to IM OSEMs, OL pitch/yaw.
• Send OSEM parts back to Mitaka so that Shoda-san can assemble them in Mitaka.

Plan for week of 2/19

• Enzo back from Tuesday.
• Shoda-san at Mitaka.
• Hirata-san at Mitaka Mon+Tue (to receive and wash parts).
• All others at Kamioka.
• -
• 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.
• Hook BF/... section.
• Route cables up to under SF.
• Check/adjust total mass of BF/... section.

Plan for week of 2/26

• Shoda-san at Mitaka.
• -
• Add Cu segments to SF cap.
• Lift SF/... section and check total mass and balance.

Vacation Info

• Enzo 1/30-2/19.
• Fabian 4/2-4/27 vacation (then gone).

Type-Bp (Shoda)

Past week report

• Simon and Arai-kun have set up length Oplev for PRM.

Plan for coming weeks

• Arai-kin, Miyo-kun, and Ohishi-san(?) will close the tank of PRM in order to release SF GAS.

OMMT & OSTM (Ohishi)

Past week report

• Ordered 4 custom-made small bellows for vertical vibration isolation.
• Some drawings of the hanging jig parts were not updated.
  • need to reorder some mechanical parts.

Plan for coming weeks

• OSEM test

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.)-->Ongoing.

  • The scheduled delivery date is 22th Feb(final).-->Adjusting.

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
• 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

Safety

• Incidents: no incident
• Foreseen risks
  • Type-A: Crane works
  • Type-B: No crane work foreseen
  • Type-Bp: Crane works

Discussion

• Next FY budget
  • OMMT+OSTM: 14,000KJPY
  • TF(SR, BS, Type-A) replacement blades: 5,000KJPY
  • TF Yaw fishing rod modification: 300KJPY

  • Type-A fishing rod CuBe blades: 100KJPY

  • Mirror disassembly jig for BS: 300KJPY
  • Damper ring for SR: 4,000KJPY (2 sets)
  • SR ballast masses: 1,500KJPY
  • In-Vacuum Cable Assembly: 400KJPY
  • ETM PI Geophones: 3,000KJPY (6sets including pods)
  • Maraging rods: 2MJPY (For Type-A and B SF Damper rings. 12 rods)
  • Feedthrough: 3MJPY (11 more need to be purchased.)

Travel Plans

• Travel (Week of 2/12):
  • Takahashi: 13-16
  • Okutomi: 13-16
  • Sato: 13-16
  • Ishizaki: 13-16
  • Mark: 13-16
  • Fabian: 13-16
  • Hirata: 14-16
  • Enzo:
  • Shoda:
  • Ohishi:
  • Fujii:
  • Tanaka:
  • Kozu (ICRR): 13-16
  • Arai (ICRR): 13-16
• Travel (Week of 2/19):
  • Takahashi: 19 - 23
  • Okutomi: 19 - 23
  • Sato: 19 - 23
  • Ishizaki: 19 - 23
  • Mark: 19 - 23
  • Fabian: 19 - 23
  • Hirata: 21 - 23
  • Enzo: 20 - 23
  • Shoda:
  • Ohishi:
  • Fujii:
  • Tanaka:
  • Kozu (ICRR): 19 - 23
  • Arai (ICRR):

Next meeting

On 2018/2/16(Fri)