Agenda/Minutes of the VIS Meeting on 2020/7/3

2020/7/3 14:00 - 15:15

Zoom Meeting

Participants: Takahashi, Hirata, Miyo, Sato, Fabian, Tanaka, Shoda

Progress report

General

• [Miyo] No progress about the heater jacket Issue

• [Miyo] No progress about the preparation for new ACC test in KAGRA. Issue

Type-A

Type-B

• I checked Terrences' package Kontrol. I played with the optimizatiom of the blending filter:
  • For the IP sensor noise I used SR2 GEO4 noise and IP H1 LDVT noise measured by Fujii-kun and myself respectively.

  • Blending filter: kontrol_blending_filter.jpg.

  • Sensor sensitivity: kontrol_sensor_sensitivity.jpg.

• Type-B paper: I went back to the simulation of the injected control noise and found some wrong signs in my simulation. Now I'm beginning to get something similar to what Takanori got for the inertial damping, but it is still work in progress.

Type-Bp

• PR models are updated to have control loop for PSD in MISALIGNED state.

  • At that time, PRs tripped due to the model restart failure klog.

  • There was a trouble that the burt file was properly loaded, and optic was too away from the linear range to turn on the control without DC offset.

Type-C

Controls

• Adjusted the actuation efficiency of TM and MN in the suspension models.

Electronics

• Measuring the filters for the LVDT combiner. Small non-polarized electrolytic condensers for narrow space had no good combined capacitance. The film condensers are tested on the breadboard now.

Post O3

• Post Obs. tasks are still on going. RT model modification for SRs was carried out. Sensor correction for SRs and SR suspension update are planed in the next week.

• Schedule towards O4 (Chart) was revised.

cf. Post Obs. task (Request), Task for O3c (Plan, Sheet), Task towards O4 (List).

Safety

Discussion

• Acceptance Test (Items).

• Bellows and flanges to be opened (List).

Travel Plans

• Takahashi (7/14-16)

Next meeting

• On 2020/7/10(Fri)