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  * Calibrated the LVDT for TF.

Agenda/Minutes of the VIS Meeting on 2018/9/21

2018/9/21 13:30 - 14:50

Zoom Meeting

Participants:Mark, Fabian, Kozu, Aso, Ohishi, Panwei, Hirata, Tanaka, Takahashi, Sato

Progress report

Schedule Chart

Type-A : (PDF/MPP)

Type-B: (PDF/MPP)

Type-A (Takahashi)

Past week report

[X-front]

  • Opened the BF cup to check the status of FR.
  • Found the deformed bracket to fix the FR blade onto the keystone.
  • The keystone dropped to the lower limit due to the deformation.
  • The FR tried to pull up the keystone, but the FR could not pull even though the slider reached at the upper limit.
  • The slider was tilted and stacked by the asymmetry of dual blades due to the deformation.

[X-end]

  • Unhooked the wires from the receptacles.
  • Disconnected the in-vacuum cables from the feedthroughs.
  • Dismounted the PI from the top chamber.
  • Replaced the actuator coil for TF.
  • Mounted the PI onto the top chamber.
  • Hooked the wires to the receptacles.
  • Connected the in-vacuum cables to the feedthroughs.
  • Adjusted the height of BF.
  • Calibrated the LVDT for TF.

Plan for coming weeks

[Y-front]

  • Test of the yaw FR for the TF.

[Y-end]

  • Assembly of the geophone pods and installation.

[X-front]

  • Procurement of parts for the BF FR.

Type B (Mark)

Report for week of 9/17

  • Monday 9/17 was holiday.
  • We optimized the trim mass on the SF to get more balance torque with less total mass. We now have a reserve of 480 g for the yaw pico.
  • We set the SF damper gap to 6 mm.
  • We set the SR2 pitch with the optic lever, aligned the IRM, and set all the OSEMs to have good clearance and midrange output.
  • We locked the SR2 suspension, craned it into the tank and hooked the LBB damper rings (but not the LBB yet).
  • With help from Ohishi-san, we removed the First Contact from SR2.
  • Mark did an audit of all the electronics boxes and updated the item list and S-number file cards on JGWDoc.
  • Mark added some thin arc weights to the inventory and finalized the number of various types to order (8*38 mm + 9*10 mm).
  • Panwei copied control filters over from the SR3.

Plan for week of 9/24

  • Monday 9/24 is holiday (Autumn Equinox).
  • Mark, Hirata-san, Fabian, Panwei at Kamioka Tue-Fri.

SR2
  • Move SR2 in-air cables.
  • Unlock and realign suspension.

SRM
  • Set pitch of SRM and RM, tighten clamps, remove winch system.
  • Weigh IM/... section.
  • Build up SS to BF level.
  • Add BF.
  • Suspend IM and tweak height/balance.

Plan for week of 10/1

  • Mark, Hirata-san, Fabian, Panwei at Kamioka Mon-Fri.

SRM
  • Cable/test BF.
  • Install IRM.
  • Install/cable/test IM OSEMs.

Plan for week of 10/8

  • Monday 10/8 is Sports Day.
  • Enzo returns Tuesday 10/9.
  • Mark and Terrence (plus TBD) at Kamioka Mon-Fri.
  • Enzo, Hirata-san, Fabian and Panwei at Kamioka Tue-Fri.

SR2/SR3
  • Terrence to set up LEN half of SR3 OL and, time permitting, TILT and LEN for SR2.

SRM
  • Continue installation.

To-Do Lists, Schedule

Vacation/Visitor Info

  • Enzo: 9/15 through 10/8 vacation in Chile.
  • Terrence: 10/8-12, 10/29-11/2 at Kamioka.

Type-Bp (Shoda)

Past week report

  • The orientation of the PRM mirror was adjusted to reflect the input beam back to the IFI
  • As a result, the IM OSEM went out of the range
  • We also found that the BF keystone was sitting on the EQ stop
  • We lifted the BF keystone with the fishing rod
  • Then we adjusted the OSEM positions, by entering the chamber, to get them back to the working range.
  • Now the PRM is in a good alignment state.
  • The transfer function measurement shows it is healthy.

  • Related klog entries 6192 6215

Plan for coming weeks

OMMT & OSTM (Ohishi)

Past week report

Plan for coming weeks

VIS electronics (Tanaka)

Past week report

  • JGW-S1403045 Assembled Chassis of the KAGRA LVDT Driver
    • Received to MTK(NAOJ) for Repair 2018/09/18
    • I had identified a broken board. And S1403073 removed.
    • Returned to Kamioka(Mozumi) 2018/09/19.
    • Waiting for parts(for repair) order and arrival for S1403073.

Plan for coming weeks

  • I'll take a summer vacation.

Other site works

Safety

  • Incidents: no incident
  • Foreseen risks
    • Type-A:
    • Type-B: Crane work

Discussion

  • LVDT driver tally again

Travel Plans

  • Travel (Week of 9/24):
    • Takahashi: 26-28
    • Okutomi:
    • Sato: 25-28
    • Lucia: 25-28
    • Fabian: 25-28
    • Mark: 25-28
    • Hirata: 25-28
    • Enzo:
    • Shoda:
    • Ohishi:
    • Fujii: 25-28
    • Tanioka:
    • Tanaka:
    • Kozu (ICRR):
    • Arai (ICRR):
  • Travel (Week of 10/1):
    • Takahashi: 1-5
    • Okutomi:
    • Sato: 1-5
    • Lucia: 1-5
    • Fabian: 1-5
    • Mark: 1-5
    • Hirata: 1-5
    • Enzo:
    • Shoda:
    • Ohishi:
    • Fujii: 2-5
    • Tanioka:
    • Tanaka:
    • Kozu (ICRR):
    • Arai (ICRR):

Next meeting

On 2018/9/28(Fri)

KAGRA/Subgroups/VIS/VISMinutes20180921 (last edited 2018-09-21 18:15:45 by RyutaroTakahashi)