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

• Join to the test of WFS.

Type B

Report for the week 26-08-2019

• Shoda-san improved the SR3 optic pitch filter (klog 10152, 10217).

• For the SR3 optic Enomoto-kun implemented an integrator filter with UGF above the micro-seismic (klog 10014). This filter used the oplve signal.

  • It works well, but it requires a set-point, which is currently set at the IM level (for IM DC control) not at the optic level.
  • A clear and clean implementation requires moving the set-point to the optic level and then take the error signal to the IM.
• Nakano-kun modified the SR2 optic set-point to a place which is not so suitable for the oplev. We will move the QPD on Monday.
• I modified the SR2 tower real-time model to allow for LVDT correction and feedforward with seismometer.
  • I had to modify the PEM real-time model to connect the seismometer channels to the Dolphin network.
  • Both models compile and I'm currently modifying the medm screen.
• Performance report
  • There was a typhoon before the F2F meeting and this week we have had bad weather, in both cases there was an increase of the micro-sesmic activity.
  • During the typoon we saw a large peak at 150 mHz and this week we saw a peak a large peak at 60 mHz.

  • With bad weather Type B suspensions' optic motion (upper limit) were above the requirement in TM-L displacement and velocity: BS 10046, SR2 10052, SR3 10056, SRM 10067.

  • Nevertheless, in days with good weather the suspensions behave mostly well in ALGNED and FLOAT states: BS 9697, SR2 9703, SR3 9702, SRM 9704.

  • I also found the vertical ground motion induces motion in TM-Y and TM-P, but even with bad weather the motion remain below the requirement.

• With this bad weather I was able to measure transfer functions from the ground to (klog 10170).

Plan for the week 02-09-2019

• On Monday I will work with Yokozawa-san putting accelerometers on the SR3 oplev platforms. We will likely turn the fans off to do measurements.
• We will move the SR2 tilt oplev QPD.
• Real-time model: move the optic set-point to the optic level.
• Update medm screens.
• Shoda-san reported a coil-driver not working properly with the binary input/output. I need to check.
• Test Shoda-san's fisnhing rod off-loading script with SRM sometime next week.
• Terrence will be back on Wednesday.

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

Comments from the site workers

• It seemed that the proposed schedule did not include the integration period (a period after the hardware installation, before starting the interferometer work, i.e., suspension commissioning work YF guess).
• It would be better to have a slot to consider the feasibility and robustness of the schedule so on, more seriously, with VIS folks.

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)