Agenda/Minutes of the VIS Meeting on 2017/5/12

2017/5/12 13:30 - 14:30

Participants:Mark, Aso, Enzo, Ishizaki, Takahashi, Sato, Tanaka, Ohishi, Hirata, Fabian, Akutsu

Progress report

Schedule Chart : (PDF,MPP)

• Type-A: On schedule (some PI assembly steps were postponed)
• Type-B: 6 weeks delay. Targeting to start the installation into the chamber in the week of June 5th.
• Type-Bp: 1 day delay.

Type-A (Takahashi)

Past week report

Installation in Y-end:

8th(Mon)

• Adjusted the strength to fasten the screws for the cap of F2 again.
• Adjusted the weight of F2 again.
• Adjusted the height of F1 for the release sensor (no spacer).

9th(Tue)

• Applied the cabling around the F1
• Checked the connection and repaired some broken cables.
• Assembled the bridge frame.

10th(Wed)

• Repaired additional broken cables.
• Adjusted the weight of F2 again. Total number of ballast masses was two.
• Lifted down the EQ stop into the corrugate tube. The end plate for F1 sit on the frame lock.
• Extended the EQ stop up to the top plate.

11th(Thu)

• Mounted the bridge frame on the foot hold.
• Mounted the pre-isolator on the bridge.
• Inserted the maraging wire between the F1 and TF.
• The distance between the receptacles was too long, so the wire did not been hooked.
• Lifted down the EQ stop into the corrugate tube. The top plate sit on the frame lock.
• The DP-BF stage reached at the cross tube.

12th(Fri)

• Fixed the bottom of EQ stop in the cross tube.
• Dismounted the dummy payload from the EQ stop.

Plan for coming weeks

• Take out the dummy payload from the cross tube.
• Test the connection to the cryo-payload.

Type B (Mark)

Past week report

At Kamioka (Mark, Fabian, Enzo, Perry, Hirata-san):

• We counted the used/broken/unused/need cables for Type B.
• Hirata-san and Mark installed blades in three LBB blade units.
• Hirata-san checked the LBB blade units to see how badly the blade tips were misaligned. The bases will need to be moved towards the clamp end by 21 mm. It is probably not feasible to turn the screw holes into slots, so an adapter part will need to be designed.
• We checked that the new in-vacuum geophone cables that Takahashi-san had got for us were the proper new-style ones. (Thus we will need in-air descrambler cables.)
• Shoda-san sent Enzo a document by Joris on the tuning of the LVDTs, so he stated working through it. He also researched the specifications of all the coils (PI and SF as well as BF.)
• We found the damper magnets and the template for placing the magnets on the ring for the SF.
• Hirata-san installed and wired up the PI yaw stepper. The vertical stepper still needs wiring, and the horizontal stepper wiring needs to be made vacuum-compatible.
• We installed safety bars on the ±X side of the assembly frame about 3 m off the floor, so they are at waist height for a person standing on one of the tall ladders. The one on the +X side will be very good for safety where it is, but the one on the -X side will need re-doing: it is too close and not very securely attached because of interference from vacuum pump cabling.
• We unlocked the inverted pendulum and experimented with adding weight. It was still stable with 4 layers of arc weights.
• We also experimented with getting both the IP centered and the security structure vertical (so that the suspension hang centrally within it). We managed to get it all right with a combination of leveling the PI with the jacks and moving the IP with the fishing rods.
• Adjusting the verticality of the SS had left the bottom of it off-center in the assembly frame, so we picked the entire system up with the crane and moved it in +Y and -X a few mm to re-center it.
• We started to remove the PI so we could do various adjustments (check the SF LVDT, reconfigure the Cu damper, add the hex cable clamp on the rod and hang the magnet disk for the SF damper) but gave up when the PI-SF jammed in the SF.

Plan for coming weeks

For more detail, see KAGRA/Subgroups/VIS/TypeB/ToDo.

Week of 5/15:

• Enzo from Tuesday 5/16 (driving test), rest of team from Monday.
• Fix PI-SF rod jamming.
• Remove PI
• Remove SF cap.
• Continue debugging SF LVDT.
• Reconfigure Cu damper ring on SF cap.
• Add magnets to upper SF damper ring.
• Add cable clamps on the PI (a few places are inaccessible when the PI is on the assembly frame).
• Reinstall PI, this time with rods and damper ring.
• Reinstall PI-SF rod, this time with hex cable clamp.
• Prepare for PR2 bellows removal on 5/15 (move table with tools).
• Cable/test PI horizontal LVDTs and steppers.
• Install/cable/test geophones.

Type-Bp (Shoda)

Past week report

Plan for coming weeks

IMMT (Ohishi)

Past week report

Plan for coming weeks

Watchdog system (Tanaka)

Past week report

• Start mounting on the 19 inch rack(Main 4ch WDS box).--> Working now.

Plan for coming weeks

• Ongoing

  • Mounting on the 19 inch rack(Main 4ch WDS box).-->Schedule to complete.

  • Start creation of extended I/O PCB(plot type (With the Main 4ch WDS box and I/O box,I/O board For relay).
• Scheduled to start
  • I'll start formulating an experimental plan(First test) at the KAGRA site.

Safety

• Incidents: Safety bar fell on Fabian's head. He had a helmet on. No injury.
• Foreseen risks
  • Type-A: Working with a different subsystem. Tight communication is necessary. Removal of the dummy payload.
  • Type-B: Crane work on the PI.
  • Type-Bp: Installation of the suspension chain into the vacuum chamber.

Discussion

• JPS presentations (abstract submission deadline: May 22nd)
  • Type-A: Okutomi (to be confirmed)
  • Type-B: Mark
  • Type-Bp: Shoda (to be confirmed)
• ASJ presentations (abstract submission June 6 to 13)
  • Type-A: Takahashi
  • Type-B: Fabian
  • Type-Bp: Ohishi

Travel Plans

• Travel (Week of 5/15):
  • Takahashi: 15 - 19
  • Shoda: 15 - 18
  • Mark: 15 - 19

  • Fabian:15 - 19

  • Okutomi: 15 - 19
  • Fujii:
  • Ishizaki: 16 - 19
  • Hirata: 15 - 19
  • Sato: 16 - 19
  • Enzo: 16 - 19
  • Ohishi:
  • Tanaka:
  • Sekiguchi(Hosei): 16 - 19
  • Hirayama(Hosei): 16 - 19
• Travel (Week of 5/22):
  • Takahashi:
  • Shoda:
  • Mark:
  • Fabian:
  • Okutomi:
  • Fujii:
  • Ishizaki:
  • Hirata:
  • Sato:
  • Enzo:
  • Ohishi:
  • Tanaka:
  • Sekiguchi(Hosei):
  • Hirayama(Hosei):

Next meeting

On 2017/5/19(Fri)

VIS F2F: 5/26 (Fri)