Agenda/Minutes of the VIS Meeting on 2020/3/6

2020/3/6 14:00 - 16:30

Zoom Meeting

Participants: Takahashi, Shoda, Hirata, Sato, Ishizaki, Tanaka, Fujii, Aso, Fabian, Okutomi, Miyo

VIS Commissioning Task List

Post-O3 task list

Procurement list in 2019FY

Schedule afetr O3

Progress report

Type-A

Past week report

• ITMX GAS control output accumulated (Reported by Washimi, klog#13259)

  • Even the temperature variation was not so drastic (by less than 1 ℃), the absolute value of the control output reached 20,000 counts.
• IP control for seismic attenuation (Lucia, Fujii)

  • 0.2 Hz resonant gain implemented but not effective. (klog#13294, #13357)

• ITMY GAS height adjustment for beam position improvement (Nakano, Aso, Lucia, Okutomi)
  • In order to suppress the 1-Hz growing up with the PRFPMI locked, we wanted to lift up the ITMY.

  • ITMY F3 GAS fishing rod brought up the payload by 2 mm, but it was cancelled due to unhealthy oplev sum behavior .(klog#13304)

• ETMX/Y L2Y coupling reduction (Lucia)

  • The coupled yaw motion in the TM oplev was reduced by adjusting the sensing matrix with translating the IP stage in L. (klog#13359)

Plan for coming weeks

• Just curiosity (YF): Do we have any chances to try to implement feed-forwarding at IP-stage in the commissioning break?

  • If we have a time period that no one uses the interferometer, maybe I feel I would like to try.

Type B

Past week report

• I uploaded a document in the JGWDoc website describing the intended work for Type-B suspensions in 2020: JGW-E2011534. The motivation was just to have source of clear information of what we have to do. It doesn't have to be limited to Type-B.

• Limits switches for F0 yaw stepper motor:
  • Last week there was an uncertainty as to how we connected the exisitng F0 yaw stepper motors in SR suspensions; there was a discrepancy between the cabling diagram and what I remembered.
  • We checked the documentation and we remembered Hirata-san improvised 50 cm cable assemblies with 1.5 mm plugs (Burndy) in one end and a male D-sub in the other, then we used a 2.5 m extension cable with female connectors in both ends to reach the flange (Type 2-2.5). Only four threads were connected.

  • For the work this year we will need, for Type-B only, 4 × 50 cm cable assemblies with eight 1.5 mm plugs (Burndy) in one and a male D-Sub connector in the other; additionally, we will require 1 × 2.5 m extension cable with female connectors in both ends for the BS, which doesn't have the yaw stepper motor.

• Limit switches for SR IPs: it seems all the harware is connected and all we need to do is just to learn how to use them in software; is this statement correct?

• What's the status of the oplev boxes?
• Was there a problem with SR2 real-time model? I heard in the morning briefing today this was solved by Aso-san.

Plan for coming weeks

Type-Bp

Past week report

Plan for coming weeks

OMMT & OSTM

Past week report

Plan for coming weeks

VIS electronics

Past week report

• Summarized the past measurements and simulations.

Plan for coming weeks

• A disconnection around the AD630 was found. Measure the TF with collect connection.

Safety

Discussion

• Status of ACC development (Takahashi)

  • just curiosity (YF): Should we calculate the required sensor noise level beforehand for the purpose of blending?
  • (YF): Do we have any plan to update the seismic spectra at the site?

  • (KM): つ Seasonal Change Spectrum or klog9468

Travel Plans

• Travel (Week of 3/9):
  • Takahashi:
  • Sato:
  • Hirata:
  • Shoda:
  • Fujii:
  • Tanaka:
• Travel (Week of 3/16):
  • Takahashi: 16-18
  • Sato:
  • Hirata:
  • Shoda:
  • Fujii:
  • Tanaka:

Next meeting

On 2020/3/13(Fri)