Agenda/Minutes of the VIS Meeting on 2019/3/22

2019/3/22 14:10 - 15:00

Zoom Meeting

Participants: Lucia, Fabian, Mark, Eleonora, Terrence, Aso, Takahashi, Fujii, Sato, Ishizaki, Enzo, Hirata

Progress report

Schedule Chart

Site work schedule: [[|XLSX]]

Type-A : (PDF/MPP)

Type-B: (PDF/MPP)

Type-C: (XLSX)

Type-A (Takahashi)

Past week report

[X-end]

• Checked the BF. The chambers were closed completely.

[Y-end]

• Recovered the coil driver for IP.
• The channel of stepping motor driver for IP-H1 was broken. Changed the assignment of channel from "motor1" to "motor5".
• Adjusted the IP position to the initial one.

[Y-front]

• Assembled the cable for Pt100.

Plan for coming weeks

Type B (Mark)

Report for the week of 3/18

• BS
  • Terrence noticed that one of the IP LVDTs was not working. We traced it to an unplugged cable, plugged it back in and screwed it together to prevent a recurrence.
  • Simon helped us rebuild the damaged LEN OL QPD stage and Terrence reinstalled it. We removed a C-clamp that we had been using to immobilize the breadboard because it interfered with the QPD stage, and replaced it with a more elegant solution using a dog clamp underneath.
  • We noticed that the BS IP had fallen over in +L at some time shortly before Nakano-san aligned the optic on 3/18. Terrence tried to recenter it but it was unstable. We decided to remove the tank lid one more time and remove some arc weights. The IP frequency had been 39 mHz the last time it was measurable, and we increased it to a much-safer 80 mHz by removing 9 kg. We believe we were able to recover Nakano-san's alignment fairly closely.
  • Terrence then recalibrated and diagonalized both the TILT and LEN OL.
• SR2
  • Terrence recalibrated the OL.
• SR3
  • Mark pulled out unused cables leading into the SR3 cleanbooth.
  • Mark plugged back in the geophones, which had been disconnected so that others could be tested.
• SRM
  • Terrence set up the SRM Guardian.
• Etc/All
  • Mark did an audit of the OL whitening/dewhitening system and fixed a bunch of problems: the SRM chassis was the wrong type, with no actual whitening card; SR2 and SRM needed whitening filters turned on; BS LEN needed the dewhitening turned on; SR2, SR3 and SRM needed dewhitening filters installed and turned on; SRM needed more gain.
  • Terrence weeded out a minor error from his OL diagonalization scheme and got L, T and Y independent at the 1% level for SR2 and SRM. He will do SR3 next.
  • Fabian measured the gain resistor values and other settings of the LVDT drivers, in case a card or chassis fails and we have to approximate the original state without the chance to recalibrate from scratch.
  • Fabian monitored the pumpdown.

Plan for week of 3/25

• Mark, Fabian, Terrence at Kamioka Mon-Thu.
• Assist with alignment.
• Work on Type B paper.
• Tidy up.
  • Throw out foil and other garbage.
  • Gather and clean tools.
  • Gather and organize unused parts and fasteners.
  • Return all unused cables to tent.
  • Tidy up cables in rear of SR2 rack.

Vacation/Travel Info

• Enzo's final vacation till 3/29.
• Terrence's last day for now, 3/29.
• Mark compensation day for 3/21: 3/29.
• Type B going-away party for Terrence/Enzo, 3/29 in Tokyo.
• Terrence's next visit from 4/18.
• Fabian's vacation 4/26 to 5/10.
• Mark's final day ≈6/28 (TBD).

Type-Bp (Shoda)

Past week report

• The offsets for PRM-IM in P/Y in order to damp the main beam was confirmed with help of IOO team and Fabian, and they were (P, Y) = (-8000, -9500).
• Satellite boxes for PR2 and PRM are not yet replaced with the new ones.
• The LVDT board for BF-LVDT-V is not yet replaced/tuned.
• Somehow the PR2-IM was drifted largely in Yaw. Pulling back with the BF-pico will work though, we will want to check if the RM is still free from the frame maybe.

Plan for coming weeks

• Replace the Satellite boxes for PR2 and PRM with the new ones.
• Replace/tune the LVDT board for BF-LVDT-V.

OMMT & OSTM (Ohishi)

Past week report

Plan for coming weeks

VIS electronics (Tanaka)

Past week report

Plan for coming weeks

Other site works

Safety

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

Discussion

Travel Plans

• Travel (Week of 3/25):
  • Takahashi:
  • Okutomi:
  • Sato:
  • Lucia:
  • Fabian:
  • Mark: 25-28
  • Hirata:
  • Enzo:
  • Shoda:
  • Ohishi:
  • Fujii: 27-29
  • Tanioka:
  • Tanaka:
  • Terrence
• Travel (Week of 4/1):
  • Takahashi:
  • Okutomi:
  • Sato:
  • Lucia:
  • Fabian:
  • Mark:
  • Hirata:
  • Enzo:
  • Shoda:
  • Fujii: 1-4
  • Tanioka:
  • Terrence

Next meeting

On 2019/3/29(Fri)