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)