Agenda/Minutes of the VIS Meeting on 2018/6/15

2018/6/15 13:30 -

Zoom Meeting

Participants: Takahashi, Sato, Barton, Tapia, Hirata, Kozu, Terrence, Ohishi, Tanioka, Tanaka, Fujii, Okutomi, Shoda, Ishizaki, Tanak(ICRR)

Progress report

Schedule Chart

Type-A : (PDF/MPP)

Type-B: (PDF/MPP)

Type-A (Takahashi)

Past week report

[Y-front]

• Mounted the BF onto the EQ stop. The DP was suspended from the BF.
• Tuned the BF. Compressed the all five blades. The tuned frequency was 0.24Hz at 198kg.
• Modified the FR for BF. The fixing point of blade was changed. The FR can cover the full range of keystone.
• Calibrated the LVDT for BF.
• Made the short cables for BF damper.
• Assembled the end plate for F3.
• Extended the EQ stop to the F3 stage. Attached the support plate for the BF damper.
• Assembled the FR for F3 with the new blades.
• Assembled the connector plates for F3. Attached them to the cup.
• Cabled for the LVDT-Actuator and the stepping motor for F3.
• Measured the weight of F3. It was 82.9kg.
• Mounted the F3 onto the EQ stop. The BF was suspended from the F3.
• Cabled between the BF and the F3.
• Tuned the F3. The tuned frequency was 0.31Hz with the additional load of 6kg.
• Checked the range of FR for BF. The FR can cover the full range of keystone.

[X-front]

• Set up the analog drivers in the rack.
• Checked the dimension of distance between the beam axis and the cross tube.

Plan for coming weeks

• Calibrate the LVDT for F3.
• Go to the F2 stage.
• Tune the TF in X-front.

Type B (Mark)

Report for week of 6/11

• Mark fixed some channels displaying white on the BS MEDM screens due to issues from splitting the model.
• Enzo redid the SR3 BIO connections to match the now-working BS setup. He also fixed PR2, which had a similar problem.
• Enzo replaced LPCDs with HPCDs in the SR3.
• Hirata-san installed the cable clamps and Cu segments on the SF cap.
• Hirata-san and Kozu-kun continued tuning the filter in PI #3. Unfortunately it seems to be rather weaker than expected, and we have not found a compression setting that gives a good frequency. We may have to use tricks like reducing the number of Cu segments on the SF (or using Al ones) to save weight.
• Mark, Enzo and Terrence suspended the BF/... section from the SF, routed all the cables from the BF/... stages up around the BF, via the SF-BF margin rod to the bottom of the SF, and got the hanging section aligned for TFs.
• Enzo cabled and tested the SF LVDT (but not yet the SF FR).
• Mark and Enzo released an update to the BS Circuit Diagram D1503600-v15 with corrections to the BIO and other sections.

Plan for week of 6/18

• Mark, Enzo, Hirata-san, Kozu-kun, Terrence at Kamioka Mon-Fri.
• --
• Receive second and third sets of LBB damper rings.
• Take TFs.
• Cable, test SF LVDT and FR.
• Add calculated ballast to SF.
• Finish tuning F0 #3 for SR3.
• Park F0 #1 (for SR2) in top of SR3 assembly frame.
• Move F0 #3 behind SR3.
• Move F0 #1 to "factory" area (in front of SRM) and start rebuild.
• Install PI.
• Suspend SF/... section.
• Lots of cabling.

Plan for week of 6/25

• Mark, Enzo, Hirata-san, Kozu-kun, Terrence at Kamioka Mon-Fri.

To-Do Lists, Schedule

• KAGRA/Subgroups/VIS/TypeB/ToDoBS

• KAGRA/Subgroups/VIS/TypeB/ToDoSR

• JGW-L1807779 Type B Schedule (SR)

Vacation Info

Type-Bp (Shoda)

Past week report

• Worked on Oplev diagonalization for PR2 and PR3.
• Coil balance of PR2 optic was adjusted
• PR3 IM and BF sensor matrices were also diagonalized.
• Working on decay time (w/ damping) measurement on PR3.

Plan for coming weeks

OMMT & OSTM (Ohishi)

Past week report

• Thanks to Tanioka-san and Nagano-san (NICT), we have finished parts replacement of IMMT1.
• We have replaced stainless screws in the intermediate mass with non-magnetic screws.
• Measured transfer functions of length, pitch, and yaw and found no problem.

Plan for coming weeks

• Order some parts of OMMT.

LVDT Driver (Tanaka)

Past week report

Plan for coming weeks

Other site works

• Power line replacement is planed on 26th June.

Safety

• Incidents:
• Foreseen risks
  • Type-A: Crane work.
  • Type-B: Crane work.
  • Type-Bp:

Discussion

• Commissioning of X-arm in autum.

The commissioning team is requiring the lift up of both ITMX and ETMX by ~ 10 mm. It is difficult to lift up the ETMX by the FR more than several mm due to the bistable problem in the F2.

• Tuning of TF for SR3.

Optimal point lower than 0.3Hz was not found in the compression of 18~30mm. The lowest frequency was 0.4Hz at 245kg. Try to find a point higher than 0.5Hz at the load larger than 255kg again.

Travel Plans

• Travel (Week of 6/18):
  • Takahashi: 18-22
  • Okutomi: 18-22
  • Sato: 18-22
  • Ishizaki:
  • Mark: 18-22
  • Hirata: 18-22
  • Enzo: 18-22
  • Shoda:
  • Ohishi:
  • Fujii:
  • Tanioka:
  • Tanaka:
  • Kozu (ICRR): 18-22
  • Arai (ICRR):
  • Terrence: 18-22
• Travel (Week of 6/25):
  • Takahashi: 25-29
  • Okutomi:
  • Sato: 25-29
  • Ishizaki:
  • Mark: 25-29
  • Hirata: 25-29
  • Enzo: 25-29
  • Shoda:
  • Ohishi:
  • Fujii: 25-29
  • Tanioka:
  • Tanaka:
  • Kozu (ICRR): 25-29
  • Arai (ICRR):
  • Terrence: 25-29

Next meeting

On 2018/6/22(Fri)