Agenda/Minutes of the VIS Meeting on 2018/3/30

2018/3/30 13:30 -

Participants:

Progress report

Schedule Chart

Type-A : (PDF/MPP)

Type-B: (PDF/MPP)

Type-A (Takahashi)

Past week report

[X-end]

• Adjusted the weight of cryo-payload (CP).
• Adjusted the height of F1, F2, and F3 using the FRs. The height of BF was set to 80mm.
• Set the height of F0 keystone to 5.5mm adjusting the weight on the keystone.
• Aligned the CP using the yaw adjustment screw in F0.
• Adjusted the position of secondary coils for the BF damper.
• Released the IP. Adjusted the horizontal FRs. Applied the DC control.
• Closed the top chamber.

[X-front]

• Cabled the LVDT-Actuator and the FR in the F1.
• Mounted the F1 onto the EQ stop with the maraging wire.
• Cabled between the F2 and the F1.
• Calibrated the LVDT of F1.
• The height of keystone was too low without additional weight on the F2.
• Compressed four blades.
• Replaced the blade of FR from the F2 type to the F1 type.
• Measured the transfer functions. The frequency of F1 was 0.3Hz.
• Found that the F3 is not working.
• Disassembled the F1 stage to lift up the F3.

Plan for coming weeks

[X-front]

• Recover the F3.
• Go buck to the F1 stage.
• Prepare for the pre-isolator.

Type B (Mark)

Past week report

Report for week of 3/26

BFs:

• BF No. 1:
  • Fujii-san finished tuning. Optimal load: 52.15[kg]. Resonance frequency: 0.37[Hz]. Optimal height: 64.7[mm].
  • We wired the LVDT, Picomotor and Steppermotor.
  • We measured the keystone tilt at different points and the differences are within 0.1[mm]
  • We added cable clamps to the base.
• BF No.7:
  • Tanioka-san and Fujii-san replaced the blades corresponding to the BS for the SR type blades.
  • The yoke position was corrected.
  • The fishing rod was assembled.
  • Compression tuning is ongoing.??

SFs:

• Hirata-san and Tanioka-san set up the frame to check the SFs.
• SF (B2-5):
  • Hirata-san, Fujii-san and Tanioka-san checked the optimal load with and without cap. The optimal load changes about 250[g]. The cap didn't come out smoothly.
  • We measured the keystone tilt at different points, and the differences are within 0.1[mm] (65.5, 65.5, 65.5, 65.4)
• SF (B2-6):
  • Hirata-san, Fujii-san and Tanioka-san checked the optimal load with and without cap (On going?).
  • We measured the keystone tilt at different points, and the differences are within 0.3[mm] (63.7, 63.5,63.8, 63.8)

SR3/SRM:

• Kozu-kun and Enzo finished the SR3 in-air cabling.
• Enzo prepared the SR3 and SRM rack in parallel (On going).

SR2:

• Hirata-san tested the safety bars in the SR2 area.
• We got new power supply for the SR2 Rack. Before, the power was coming from the BS rack.

BS:

• Kozu-kun and Enzo helped Enomoto-san troubleshooting the BS Oplev issue (On going).

Shipping:

• We received the LBB parts for SR2.
• We received the Payload parts (IM and IRM) this morning.

Plan for coming weeks

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

• Business trip plan

  • March 25(Toyama),26th-29th(Kamioka),30th(Preliminary day Toyama->Tokyo)

• Installation place-->PRM,PR3,PR2,BS,SR2(However,only to install. Launch is done on another occasion.)

  • —>Completed

• Prepare necessary documents —>

  • JGW-S1808015,S1808016,S1808017,S1808021,S1808022,S1808010,S1808011,S1808012

Plan for coming weeks

• Next install plan
  • I plan to install SR3 and SRM after completion of installation.
  • Actual launch is scheduled for May or later.

Other site works

Safety

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

Discussion

Travel Plans

• Travel (Week of 4/2):
  • Takahashi:
  • Okutomi:
  • Sato:
  • Ishizaki:
  • Mark:
  • Hirata:
  • Enzo:
  • Shoda:
  • Ohishi:
  • Fujii:
  • Tanioka:
  • Tanaka:
  • Kozu (ICRR):
  • Arai (ICRR):
• Travel (Week of 4/9):
  • Takahashi:
  • Okutomi:
  • Sato:
  • Ishizaki:
  • Mark:
  • Hirata:
  • Enzo:
  • Shoda:
  • Ohishi:
  • Fujii:
  • Tanioka:
  • Tanaka:
  • Kozu (ICRR):
  • Arai (ICRR):

Next meeting

On 2018/4/6(Fri)