Agenda/Minutes of the VIS Meeting on 2019/8/30

2019/8/30 14:00 -

Zoom Meeting

Participants:

Progress report

Type-A

Past week report

• general
  • performance test of the inertial damping was done with ETMX and ITMX.
    • This will be summarized by Lucia.

  • The simulation model for type-A suspension is now being modified from https://granite.phys.s.u-tokyo.ac.jp/svn/LCGT/trunk/VIS/SuspensionControlModel/script/TypeA/typeA_siso180517.m

    • Originally for my own use though.
    • Some channels and sensor correction paths are added.
    • Some of the filter name was corrected.
    • The updated one is in my local , is to be uploaded to SVN after renaming, adding some paths, if necessary:
      • /kagra/Dropbox/Personal/Fujii/TypeA/simulation/
• At ETMX

  • trying to tune the sensor-correction gain. Still Ongoing.local note

• At ITMY
  • A work introducing payload damping filters is started, this work is mainly taken care by Yamada-kun.
• ITMX

  • Attempts of WFS control demonstration with TM OpLev is ongoing.

    • Beside that, some missing damping filters were implemented as needed.
  • 46.6 Hz peak investigation

    • Promising mode: a higher-order mode of TM chain in pitch klog#10204

    • On the way of damping with a band-pass comb filter
• Updated the list of the modification parts in the 3D CAD model.

Plan for coming weeks

Type B

Past week report

Plan for coming weeks

Type-Bp

Past week report

Plan for coming weeks

OMMT & OSTM (Takahashi)

Past week report

• Dummy mirror was delivered.
• Ordered the spacer plate and the connector plate.

Plan for coming weeks

VIS electronics

Past week report

Plan for coming weeks

Other site works

Safety

• Incidents:

Discussion

VIS repair/upgrade work between O3 and O4

• The list is required by the SEO. They need it for scheduling and arrangement of the site works between O3 and O4 considering the task of all subsystem.
  • One more week was added to the period for EYV work.
  • Recovering of the FRs includes the adjustment of ballast masses. Though needed period depends on the situation, two more weeks were added for each SR3/BS work.
  • Installation of the yaw FR for BS includes the replacement of bearing.
  • The re-gluing of the IM/TM magnets was omitted.
  • Replacement of the ferromagnetic parts on SF in BS/SR3 was added.
  • Expenses will be covered by the 2019FY budget. Spare connectors are included in the budget.
• Optional
  • Improvement of the FRs with limiter switch.
  • Improvement of the ACCs.
  • Connector supports for the assembled in-vac cables.
  • Replacement of the LVDT cards.
  • Replacement of the LVDT-actuator units in BS.
• Small items
  • Tuning of BS IP by small ballast.
  • Flip connections in BS IP H2 coil actuator.
  • Replacement of the chipped magnets (12x12x12 mm) for IP in SR3
  • Moving of the electronics to small rack in SR3.

• List for SEO

• Brain storming page

Travel Plans

• Travel (Week of 9/2):
  • Takahashi:
  • Sato:
  • Hirata:
  • Shoda:
  • Fujii:
  • Tanaka:
• Travel (Week of 9/9):
  • Takahashi:
  • Sato:
  • Hirata:
  • Shoda:
  • Fujii:
  • Tanaka:

Next meeting

On 2019/9/6(Fri)