Differences between revisions 330 and 331
Revision 330 as of 2018-09-28 13:27:48
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Revision 331 as of 2018-10-05 18:27:58
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Editor: MarkBarton
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==== Report for week of 9/24 ====
 * Monday 9/24 was a holiday (Autumn Equinox).
==== Report for week of 10/1 ====
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 * We moved all the SR2 feedthrough and in-vacuum and in-air cables.
 * We tested all the OSEMs and most of the LVDTs. We still need to run power to the pico drivers, and test them and the steppers.
 * We unlocked and mostly realigned the suspension. The IM is sitting lower than before but can be brought up to nominal height with BF GAS offset, without any signs of anything touching. The IM also has a moderately large pitch (2.8 mrad according to the OSEMs, about 1 mrad according to the OL) and some roll, which we expect to be able to correct with some pico adjustment. The horizontal IM OSEMs are well-centered (so there is no yaw misalignment).
 * We solved a mystery with the height of the BF keystone: it turns out that running the table KOACH filters in the tank warms it up (by about 1.5°C) and causes significant sag (700 µm). D'oh!
 * We ran power to the pico drivers.
 * We got the lower section of the SR2 fairly well aligned with just a bit of adjustment with the IM pitch and roll picos.
 * We helped Lucia double-check the geometry of the IP - the current matrix calculation assumes the FRs and the LVDT sensors and actuators are colocated, which is much closer to true than for the BS, but not quite right.
 * We gave up on doing anything more with SR2 for now because we're waiting on extra extension cables for the PI and Fujii-kun will want to borrow one of the geophones next week for a huddle test with new geophones.
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 * We made another attempt to set the pitch of the SRM, but weren't satisfied with how close we were able to get (target 20 mm low, achieved 23 mm), so we didn't tighten the clamps or continue to setting the pitch of the RM.

==== Plan for week of 10/1 ====
 * Mark, Hirata-san, Fabian, Panwei at Kamioka Mon-Fri.
===== 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.
 * Cable/test BF.
 * Install IRM.
 * Install/cable/test IM OSEMs.
 * We set the pitch of the SRM and RM, tightened the clamps and removed the winch system.
 * We installed the BF crossbars of the assembly frame and the BF ring section of the security structure.
 * We lifted the IM/... section on the load gauge to find its weight.
 * We craned in the BF and removed the cap.
 * We installed the BF-IRM rods and the IRM top plate.
 * We installed the BF-IM maraging rod and flying saucer cable clamps.
 * We suspended the IM/... section and adjusted the trim masses for balance and total mass. It took quite a lot of adjustment in each of pitch, roll and vertical. The vertical was due to the fact that the weight of the IM/... section is very close to that of SR2/SR3 but the SRM BF is about 0.5 kg weaker. The roll was due to the fact that the default configuration of trim mass had no correction for the horizontal wedge on the optic. However the pitch is a bit of a mystery - nearly all of the removed mass had to come off the AR side. Fortunately we were able to correct for it entirely with masses we had in hand.
 * We routed the TM OSEM cables via the flying saucer up to the underside of the BF.
 * We got 2 power supplies from Shimode-san so we can fire up the SRM rack next week. He will also supply suitable cables to connect the power supplies to the DC power strip in the rack.
 * We received the replated yoke for the SRM top filter.
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 * Continue installation.  * Cable/test BF.
 * Install IRM.
 * Install/cable/test IM OSEMs.
 * Suspend/weigh/balance the BF/... section.

Scraps of text for incorporation in the VIS Meeting Minutes

KAGRA/Subgroups/VIS/MeetingNAOJ

Type B (Mark)

Report for week of 10/1

SR2
  • We solved a mystery with the height of the BF keystone: it turns out that running the table KOACH filters in the tank warms it up (by about 1.5°C) and causes significant sag (700 µm). D'oh!
  • We ran power to the pico drivers.
  • We got the lower section of the SR2 fairly well aligned with just a bit of adjustment with the IM pitch and roll picos.
  • We helped Lucia double-check the geometry of the IP - the current matrix calculation assumes the FRs and the LVDT sensors and actuators are colocated, which is much closer to true than for the BS, but not quite right.
  • We gave up on doing anything more with SR2 for now because we're waiting on extra extension cables for the PI and Fujii-kun will want to borrow one of the geophones next week for a huddle test with new geophones.

SRM
  • We set the pitch of the SRM and RM, tightened the clamps and removed the winch system.
  • We installed the BF crossbars of the assembly frame and the BF ring section of the security structure.
  • We lifted the IM/... section on the load gauge to find its weight.
  • We craned in the BF and removed the cap.
  • We installed the BF-IRM rods and the IRM top plate.
  • We installed the BF-IM maraging rod and flying saucer cable clamps.
  • We suspended the IM/... section and adjusted the trim masses for balance and total mass. It took quite a lot of adjustment in each of pitch, roll and vertical. The vertical was due to the fact that the weight of the IM/... section is very close to that of SR2/SR3 but the SRM BF is about 0.5 kg weaker. The roll was due to the fact that the default configuration of trim mass had no correction for the horizontal wedge on the optic. However the pitch is a bit of a mystery - nearly all of the removed mass had to come off the AR side. Fortunately we were able to correct for it entirely with masses we had in hand.
  • We routed the TM OSEM cables via the flying saucer up to the underside of the BF.
  • We got 2 power supplies from Shimode-san so we can fire up the SRM rack next week. He will also supply suitable cables to connect the power supplies to the DC power strip in the rack.
  • We received the replated yoke for the SRM top filter.

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
  • Cable/test BF.
  • Install IRM.
  • Install/cable/test IM OSEMs.
  • Suspend/weigh/balance the BF/... section.

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.

KAGRA/Subgroups/VIS/TypeB/Minutes (last edited 2022-09-02 09:11:42 by fabian.arellano)