Agenda/Minutes of the VIS Meeting on 2018/2/16

2018/2/16 13:30 -

Participants:

Progress report

Schedule Chart

Type-A : (PDF/MPP)

Type-B: (PDF/MPP)

Type-A (Takahashi)

Past week report

[X-front]

• Put the BF onto the end plate inserting the suspension wire for DP.
• Installed the EQ stop with the BF and the DP into the top chamber.
• Adjusted the height of release sensors for the DP.
• Installed the F3 into the clean booth.
• Assembled the release sensors, the side stoppers, the FR, and the connector plates for the F3.
• Replaced the receptacles for wires in the F3.
• Cabled the release sensors, the LVDT, the actuator, and the stepping motor in the F3.
• Checked the additional FR blade for the BF. It can pull up the 8kg weight.
• Calibrated the LVDT in the BF. Adjusted the height of secondary coil.
• Repairing the side stoppers.

[Broken blades]

• Sent a sample of the broken blade to Nikhef.
• Rolling process for new blades was suggested. It will take two months.

  1) Cutting the black skin: 53t --> 50t, 2) Hot roll: 50t --> 8.0t, 3) Cold roll: 8.0t --> 6.5t, 4) Fine roll: 6.5t --> 5.0t

Plan for coming weeks

• Attach the additional FR and tune the BF again.
• Extend the EQ stop to the F3 stage.
• Tune the F3.
• Cable between the BF and the F3.

Type B (Mark)

Report for week of 1/29

• Fabian and Kozu-kun tested the FR stepper, and calibrated the keystone height as a function of FR position.
• Fabian, Hirata-san and Kozu-kun installed and adjusted the IRM, IM OSEMs and associated cables.

• Mark derived the diagonalization matrices for SR, posted them as T1807663 and entered them in the on-line system.

• Mark fixed the GASALL screen, which had some elements hardwired to BS and did not work for SR2.
• Mark initialized the watchdog section of the SR2 model (filters, thresholds etc).
• Mark re-entered the IM OSEM2EUL offsets and gains, which had been entered by Enzo, but had not been saved and had been lost.
• Mark identified and fixed a bug in the SF2 whereby the watchdog trigger was derived from the AND of the error signals from the various stages instead of the OR. Thus all stages would have to overload before the watchdog tripped. All other VIS models were similarly affected, and all affected library parts have been fixed, but the other models need to be rebuilt, which should be done at the earliest opportunity, e.g., early next week after the scheduled power outage on Sun 2/18.
• Mark fixed the indicators for the watchdog on the OVERALL screen, which also had bad logic.
• Mark tried using Shoda-san's measurement script to do TFs. It ran successfully, but the first data set was no good because of two issues: the excitation was apparently too large (even after a reduction by 20) and the SENSALIGN matrix was not initialized.
• Hirata-san negotiated with Kimura-san to get the SRM tank mushroom installed (this will probably happen from Tue on the week of 3/5).

Plan for week of 2/19

• Shoda-san at Mitaka.
• Hirata-san at Mitaka Mon+Tue (to receive and wash parts), then Kamioka Wed-Fri.
• Enzo back from Tuesday, at Kamioka.
• Kozu-kun at Kamioka but limited availability (preparing poster).
• All others at Kamioka.
• -
• Do TFs from IM OSEMs to IM OSEMs, OL pitch/yaw.
• Sort out cables per Enzo's master plan.
• Lift BF/... section and check total mass and balance.
• Cable and test BF picos.
• Add section of SS up to SF ring.
• Bring in SF.
• Hook BF/... section.
• Route cables up to under SF.
• Check/adjust total mass of BF/... section.

Plan for week of 2/26

• Shoda-san at Mitaka.
• -
• Add Cu segments to SF cap.
• Lift SF/... section and check total mass and balance.

Plan for week of 3/5

• Shoda-san at Mitaka.
• Hirata-san vacation Mon 3/5, then Kamioka
• Others at Kamioka.
• -
• Get SRM tank mushroom section installed (Hirata-san, Kimura-san)
• SR3 rack setup.

Type-Bp (Shoda)

Past week report

Plan for coming weeks

OMMT & OSTM (Ohishi)

Past week report

Plan for coming weeks

Watchdog system (Tanaka)

Past week report

• Preparation for assembly of mass products.-->Ongoing.

• Adjustment and approval to vendors(Implementation adjustments and approvals for circuit boards.)-->Ongoing.

Plan for coming weeks

• Preparation for assembly of mass products.
• Adjustment and approval to vendors(Implementation adjustments and approvals for circuit boards.)

Other site works

• Feb 18: Black out of the Mozumi buildings
• 2/21 : Monthly crane inspection 11:30 - 12:30
• 2/26 - 3/9 Construction of the walls to isolate the arms better (for cleanliness)
• 3/12 - 3/16 Installation of the control systems for the large GVs

Safety

• Incidents:
• Foreseen risks
  • Type-A:
  • Type-B:
  • Type-Bp:

Discussion

• Analog electronics management
• Mechanical update history

Travel Plans

• Travel (Week of 2/19):
  • Takahashi:
  • Okutomi:
  • Sato:
  • Ishizaki:
  • Mark:
  • Fabian:
  • Hirata:
  • Enzo:
  • Shoda:
  • Ohishi:
  • Fujii:
  • Tanaka:
  • Kozu (ICRR):
  • Arai (ICRR):
• Travel (Week of 2/26):
  • Takahashi:
  • Okutomi:
  • Sato:
  • Ishizaki:
  • Mark:
  • Fabian:
  • Hirata:
  • Enzo:
  • Shoda:
  • Ohishi:
  • Fujii:
  • Tanaka:
  • Kozu (ICRR):
  • Arai (ICRR):

Next meeting

On 2018/2/23(Fri)