Agenda/Minutes of the VIS Meeting on 2017/10/13

2017/10/13 13:30 -

Participants: Takahashi, Mark, Okutomi, Sato, Aso, Fabian, Enzo, Hirata, Raffaele, Shoda, Ishizaki, Fujii

Progress report

Schedule Chart

Type-A : (PDF,MPP)

Type-B: (PDF,MPP)

• Type-A: Finish the BF damper assembly by the end of the next week. Close the top chamber on Oct. 19. Close the cross tube in the next next week.
• Type-B: Post installation work
• Type-Bp: Post installation work

Type-A (Takahashi)

Past week report

[X-end]

10th(Tue)

• Mounted the horizontal geophone pod.
• Adjusted the weight on DP. The wire for DP was broken. It was replaced.

11th(Wed)

• Tuned the BF.
• Tuned the TF.
• Adjusted the yaw rotation of BF.

12th(Thu)

• Adjusted the LVDT position of TF and calibrated the LVDT again.
• Released the IP and adjusted the tilt of IP using the jack through cone bellows.
• Calibrated the LVDTs of IP.
• Calibrated the ACCs.

13th(Fri)

• Calibrated the ACCs.
• Checked the motor sliders of IP.

Plan for coming weeks

• Tune the IP.
• Set the BF damper.
• Close the chamber.

Type B (Mark)

Past week report

At Kamioka (Mark, Ohishi-san, Fabian, Enzo, Hirata-san, Kozu-kun):

• We couldn't account for a bubble level, so we removed a service port cover, searched again on top of the BF and found it.
• We put the table KOACH filters on the table. Ohishi-san then removed the FC in two stages (AR side on Tue, HR side on Fri).
• Ohishi-san measured the height of the SS and optic relative to the tank and found the optic was 3 mm low but the SS was 2 mm high. According to the GAS LVDTs, the suspension had not sagged but was 1.7 mm high.
• Therefore we raised the suspension by 9 quarter-turns of the tank jacks (4.5 mm) so that the optic would be in the right position after (future) downward adjustment of the GAS filters.
• We put the GAS LVDT calibration data as offsets and gains in the LVDTINF filters so the output would be height in µm relative to nominal.
• We calibrated the IP LVDTs. We had worked around a mechanical interference due to the poor design of the old LVDTs by setting them to be 4 mm off-center with the IP locked centrally, but we discovered this was overkill and we have lost some linear range on the LVDT sensor in the opposite direction. If we have time we may move the LVDT bases 1-2 mm to a compromise position.
• We worked with Simon to get the OL aligned and to learn the adjustment procedure.
• Mark updated Sekiguchi-san's SUMCON to allow for comments to be entered next to all values (75% finished).
• Kozu-kun worked on deriving the diagonalization matrices for the IP FRs.

At Mitaka (Hirata-san):

• Hirata-san met with manufacturers and requested quotes.
• Hirata-san made many assembly drawings for sections of the SR.
• Hirata-san worked on compiling the SR inventory.

Plan for week of 10/16

Kamioka: all but Mark

• Remove sticker residue and permanent marker writing on PI.
• Fix broken and unreliable connections on IP LVDTs.
• Wipe any rust from around IP LVDTs.
• (If Enzo thinks it necessary and there's time) adjust IP LVDT mechanical offsets to maximize usable range and recalibrate.
• Add IP LVDT gains and offsets to IP_LVDTINF filter blocks.
• Calibrate IP LVDT actuation against IP LVDT sensing.
• Install damping filters for IP LVDTs.
• Adjust gains and debug damping for IM OSEMs and GAS LVDTs.
• Modify IP LVDT damping filters to include set point.
• Install and debug IP LVDT and geophone diagonalization matrices.
• (Time permitting) Try adding mass to IP.
• Work with alignment team.
• Work with Mirapro on SR LBB and tank installation (Hirata-san, from Wed)
• Work with Miyo-kun to get user interface for stepper motors.
• Calibrate IP FR actuation against IP LVDT sensing.
• SR procurement.
• Lower LBB by 17.5 mm; suspend and rebalance after removing table KOACH filters; adjust as required to get BS center 380 mm above LBB.
• Reroute cable to eliminate need for fifth feedthrough.
• Set all EQ stops to proper clearance.

Vacation Info

Mark: 10/16-24

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

Plan for coming weeks

Other site works

• Fire drill: Nov. 9 (Thu) or Nov. 16 (Thu), 11AM - 12AM
• End of Aug. to Nov.: Mozumi entrance will be closed

Safety

• Incidents: no
• Foreseen risks
  • Type-A: Crane work.
  • Type-B: Crane work. Laser Hazard. LBB installation.
  • Type-Bp: Laser Hazard

Discussion

Plan for the coming months

Travel Plans

• Travel (Week of 10/16):
  • Takahashi: 17 - 19
  • Okutomi: 16 - 20
  • Sato: 17 - 20
  • Ishizaki:
  • Mark:
  • Fabian: 16 - 20
  • Hirata: 16- 20
  • Enzo: 16- 20
  • Shoda: 16- 20
  • Ohishi: 18 (Mitaka)
  • Fujii:
  • Tanaka:
  • Kozu (ICRR): 16 - 20
  • Arai (ICRR): 16 - 20
• Travel (Week of 10/23):
  • Takahashi:
  • Okutomi: 23 - 27
  • Sato:
  • Ishizaki: 23 - 27
  • Mark: 25 - 27
  • Fabian: 23 - 27
  • Hirata:
  • Enzo: 23 - 27
  • Shoda:
  • Ohishi:
  • Fujii:
  • Tanaka:
  • Kozu (ICRR): 23 - 27
  • Arai (ICRR): 23 - 27

Next meeting

On 2017/10/20(Fri)