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   * Digital
   * Hardware
  * Digital
    * Hardware
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   * Inertial or CMRR ?
  * VIS status monitor
    * Inertial or CMRR ?
  * Guardian
   * Type-A guardian missing
   * Type-Bp guardian improvement
    * Include the OpLev TM loop
  * VIS status monitor screens
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  * L2P diagonalization for all the suspensions
  * Automatic off-load system

Agenda/Minutes of the VIS Meeting on 2019/5/24

2019/5/24 13:30 -

Zoom Meeting

Participants:

Progress report

Schedule

Site work schedule: [[|XLSX]]

Type-A (Takahashi)

Past week report

Plan for coming weeks

  • I suggest the test of IP control with/without inertial damping in the engineering run in June.

Type B (Mark)

Past week report (written by Fabian)

  • Terrence implemented a filter for the inertial damping. See entry 8905.

  • The highlight of the week is Terrence's measurement of the residual motion of the SR2 optic: as measured by the oplev, it does fulfill the RMS displacement and velocity requirements for lock acquisition and, partially, for the observation mode also. See the report at klog entry 8949.

    • The integrated RMS was calculated from 5 Hz to DC because there are some peaks between 8 Hz and 10 Hz and whose origin still has to be clarified. See the report at entries 8918 and 8933.

    • After Akutsu-san's suggestion Terrence improved the air shield in two rounds, including a cylindrical cover around the viewport. This reduced the noise by about a factor of 10.
    • He realized setting up the shield may have slightly changed something in the oplev and carried out another round of diagonalization.
    • He realized the H3 coil was not working. We fixed it.A cable was disconnected.
    • The optic residual motion in L showed a large peaks close to 0.2 Hz, which is where the micro-seismic may become apparent. The peak was not seen in P or Y. The inertial damping system is likely not working in a suitable way. The blending frequency is 0.190 Hz which may not be low enough.
    • At the end measurement of the residual motion reported was carried out with inertial damping only in yaw.
  • Fabian, Terrence and Fujii-kun measured the settings of the SR2, BS LVDT drivers and one of SR2's. See klogs 8941 , 8951 and 8952.

  • Fabian worked more on the calculation of the amount of sensor noise injected:
    • I imported Panwei's OSEM noise measurements and calculated the virtual sensor noise.
    • I imported Fujii-kun's measuement of the geophone noise and calculated the virtual sensor noise.
    • I imported the blending filter
    • I wrote lots of comments in Sekiguchi-kun's Matlab scripts.
    • I will write a klog soon with preliminar results.
  • Fabian submitted and abstract for the Autumn JPS meeting on September.

Plan for coming weeks

  • Terrence will work in the optimization of the inertial damping.
  • We have to measure the settings of the SR3 LVDT driver.
  • Fabian will continue with the calculation and prepare a presentation for the conference in Brazil.

Type-Bp (Shoda)

Past week report

  • Satellite boxes are updated (klog8928, klog8912)

  • LVDT driver boards are changed (klog8956)

  • Stepping motor BO are connected (klog8959)

  • Moderate WD is installed in PRM, and ready to be installed to the other PRs. (klog8939)

Plan for coming weeks

OMMT & OSTM (Takahashi)

Past week report

  • Sato-san is checking the 3D model of TAMA-PO type suspension in the overall model around the OMC.

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

  • Middle Sized Baffles
  • TO DO List for O3
    • Hierarchical control of Type-A (with CRY)
    • Improved watchdog
      • Digital
      • Hardware
    • Type-B IP damping
      • Inertial or CMRR ?
    • Guardian
      • Type-A guardian missing
      • Type-Bp guardian improvement
        • Include the OpLev TM loop

    • VIS status monitor screens
    • Operation manuals
    • L2P diagonalization for all the suspensions
    • Automatic off-load system

Travel Plans

  • Travel (Week of 5/27):
    • Takahashi:
    • Sato:
    • Mark: Holidays
    • Hirata:
    • Shoda:
    • Fujii: 27-28
    • Tanioka:
    • Tanaka:
    • Terrence:
  • Travel (Week of 6/3):
    • Takahashi:
    • Sato:
    • Mark: Holidays
    • Hirata:
    • Shoda:
    • Fujii: 4-7
    • Tanioka:
    • Tanaka:
    • Terrence:
    • Fabian & Okutomi: Conference in Brazil until June 18th

Next meeting

On 2019/5/31(Fri)

KAGRA/Subgroups/VIS/VISMinutes20190524 (last edited 2019-05-24 16:48:15 by YoichiAso)