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2018/4/27 13:30 - 2018/4/27 13:30 - 14:40
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Participants: Participants: Mark, Takahashi, Ohishi, Tanioka, Arai, Aso, Enzo, Tanaka, Shoda, Ishizaki, Hirata, Okutomi, Sato, Fujii
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[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.
Line 16: Line 28:

[X-front]
  * Solve the problem in the F1.
  * Tune the IP.
  * Set the ACCs.
  * Set the LVDT coils for the BF damper.
Line 19: Line 37:
 * 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 ([[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/VIS/TypeB/BSdetail|BS suspension details]])
 * We found the inconsistency between local damping measurement and interferometer measurement. ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4811|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)([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4807|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.
Line 27: Line 64:
 * I have ordered some parts; stages, standoffs, and magnets.
Line 28: Line 66:
 * I will check the response of the vertical vibration isolation bellows
 and will order remaining 8 bellows.
Line 37: Line 76:
  * Type-A: When we replaced the guide clamp, the blade clamp slipped out. Never try to replace the guide clamp !
  * Type-B: A wire hanging the RM broke.
Line 39: Line 79:
  * Type-A:
  * Type-B:
 * Type-Bp:		   * Type-A: Crane work
  * Type-B: Working with a mirror
Line 44: Line 83:
 * BS BIO issue
  * The problem was noticed but did not have time to look into it.
  * It is good that Yokozawa-san fixed it.
 * F2F speakers
  * Type-A: Takahashi
  * Type-B: Enzo
  * Phase 1 measurement results: Shoda
 * SRM mass design
  * Shoda presented the latest design
  * Overall it looks good
  * No need to make wedge for the pushing ring. Just change the height of the pushing parts.
  * The screw head needs to be solblack coated.
Line 48: Line 99:
  * Okutomi:   * Okutomi: - 5/3
Line 51: Line 102:
  * Mark:   * Mark: 4/30 - 5/2
Line 53: Line 104:
  * Enzo:   * Enzo: 4/30 - 5/2
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  * Fujii:
  * Tanioka:		   * Fujii: - 5/3
  * Tanioka: - 5/8
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  * Kozu (ICRR):
  * Arai (ICRR):		   * Kozu (ICRR): ?
  * Arai (ICRR): - 5/6
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  * Takahashi:
  * Okutomi:
  * Sato: 		  * Takahashi: 7 - 11
  * Okutomi: ?
  * Sato: 7 - 11
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  * Mark:
  * Hirata:
  * Enzo: 		  * Mark: 7 - 11
  * Hirata: 7 - 11
  * Enzo: 8 - 11
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  * Fujii:
  * Tanioka:		   * Fujii: 7 - 11
  * Tanioka: 7 - 8
Line 76: Line 127:
  * Kozu (ICRR):   * Kozu (ICRR): 7 - 11

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

2018/4/27 13:30 - 14:40

Participants: Mark, Takahashi, Ohishi, Tanioka, Arai, Aso, Enzo, Tanaka, Shoda, Ishizaki, Hirata, Okutomi, Sato, Fujii

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. Never try to replace the guide clamp !
    • Type-B: A wire hanging the RM broke.
  • Foreseen risks
    • Type-A: Crane work
    • Type-B: Working with a mirror

Discussion

  • BS BIO issue
    • The problem was noticed but did not have time to look into it.
    • It is good that Yokozawa-san fixed it.
  • F2F speakers
    • Type-A: Takahashi
    • Type-B: Enzo
    • Phase 1 measurement results: Shoda
  • SRM mass design
    • Shoda presented the latest design
    • Overall it looks good
    • No need to make wedge for the pushing ring. Just change the height of the pushing parts.
    • The screw head needs to be solblack coated.

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)