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Agenda/Minutes of the VIS Meeting on 2018/4/27

2018/4/27 13:30 -

Participants:

Progress report

Schedule Chart

Type-A : (PDF/MPP)

Type-B: (PDF/MPP)

Type-A (Takahashi)

Past week report

[X-front]

  • Suspended the filter chain from the TF.
  • Attached two cross tubes and four feedthroughs onto the top chamber.
  • Cabled from the upper small hexagon to the feedthroughs.
  • Replaced the guide clamps for two blades with thin guards. Compressed the blades by 3~8mm respectively.
  • Released the keystone of TF. The height of keystone was too low without additional load. Frequency was 1.4Hz (too high).
  • Repaired the thread hole for the hook screw for the SF damper.
  • Attached the EQ stop anchor. Adjusted the horizontal position of the EQ stop.
  • Checked the LVDT signals. Found the F1 keystone touching to the secondary coil. When the F1 sit on the release sensor, it was free.
  • Set the LVDT drivers to the rack. Calibrating the LVDTs for the BF damper.

Plan for coming weeks

[X-front]

  • Solve the problem in the F1.
  • Tune the IP.
  • Set the ACCs.
  • Set the LVDT coils for the BF damper.

Type B (Mark)

Past week report

  • Made SRM model (Dropbox/Largefiles/Subsystems/VIS/Design/SR/Model/SRM-MetalMass_180426)

  • Made 2D drawings of LBB ballast masses

Control Issue

  • Resonant frequency table is ready for BS (BS suspension details)

  • We found the inconsistency between local damping measurement and interferometer measurement. (klog4811)

    • The TF gains from IML to TML, and from TML to TML are different from the interferometer measurement.
    • I checked the TML gain, which are calculated from TMP and TMY measurements, and found EUL2COIL matrix was different from what I supposed.
      • --> Fixed it and updated the state space model. Might be OK now for TF from TML to TML. (Komori-kun will check it.)

    • I checked the calibration gain of OSEMs and found that the measured values are not used. But it makes only small difference.
    • Compare the TFs from BFGAS to BFGAS and BFGAS to IMV, and they are inconsistent for BS and PR2. (No data found for PR3)(klog4807)

    • Comparing TFs from IMP to TMP and from IMY to TMY also helps to check the OSEM calibration by comparing OSEM signals and Oplev signals.
      • Found the matrix to convert OSEM signals (um) to pitch (urad) is different from what I calculated. To be checked. The measurement will be done after phase-I.
  • Constructing the tool to implement the current filterbank information to state space model.

Plan for coming weeks

Type-Bp (Shoda)

Past week report

Plan for coming weeks

OMMT & OSTM (Ohishi)

Past week report

  • I have ordered some parts; stages, standoffs, and magnets.

Plan for coming weeks

  • I will check the response of the vertical vibration isolation bellows and will order remaining 8 bellows.

Watchdog system (Tanaka)

Past week report

Plan for coming weeks

Other site works

Safety

  • Incidents:
    • Type-A: When we replaced the guide clamp, the blade clamp slipped out.
  • Foreseen risks
    • Type-A:
    • Type-B:
    • Type-Bp:

Discussion

Travel Plans

  • Travel (Week of 4/30):
    • Takahashi:
    • Okutomi: - 5/3
    • Sato:
    • Ishizaki:
    • Mark: 4/30 - 5/2
    • Hirata:
    • Enzo: 4/30 - 5/2
    • Shoda:
    • Ohishi:
    • Fujii: - 5/3
    • Tanioka: - 5/8
    • Tanaka:
    • Kozu (ICRR): ?
    • Arai (ICRR): - 5/6
  • Travel (Week of 5/7):
    • Takahashi: 7 - 11
    • Okutomi: ?
    • Sato: 7 - 11
    • Ishizaki:
    • Mark: 7 - 11
    • Hirata: 7 - 11
    • Enzo: 8 - 11
    • Shoda:
    • Ohishi:
    • Fujii: 7 - 11
    • Tanioka: 7 - 8
    • Tanaka:
    • Kozu (ICRR): 7 - 11
    • Arai (ICRR):

Next meeting

On 2018/5/11(Fri)

KAGRA/Subgroups/VIS/VISMinutes20180427 (last edited 2018-04-29 15:44:49 by MarkBarton)