Differences between revisions 277 and 299 (spanning 22 versions)
⇤ ← Revision 277 as of 2018-04-13 13:34:42 →
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← Revision 299 as of 2018-06-29 11:15:08 → ⇥
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Editor: MarkBarton
Comment:
Deletions are marked like this. Additions are marked like this.
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==== Report for week of 4/9 ====
 * Mark glued prisms and magnet/standoff assemblies on the SR3. The SR3 needed to be raised in the box by 0.7 mm to make the prisms go on at the right height, which was done using M4 washers under the PEEK feet.
 * Mark glued ferromagnetic disks on the last 5 IM flags. This completes 2 sets, for SR3 and SRM.
 * Mark configured two pico motor drivers ordered by Takahashi-san as SR3-IM and SRM-BF.
 * Enzo and Kozu-kun finished preparing and calibrating the SF and BF for SR3 and almost entirely finished with those for SRM.
 * Hirata-san worked on building two IMs for SR3 and SRM. The SR3 one just needs to have flags attached and to be weighed; the SRM needs another few hours work.
 * Shoda-san worked on the design of the metal SRM, on the LBB ballast mass, and on the plans for testing the BS in bKAGRA Phase 1.		 ==== Report for week of 6/18 ====
 * We powered down the Type B racks as a precaution against possible loss of power during work on Tuesday, and later powered them up again.
 * We put a flange cover over the hole in the floor near the filter tuning area as a temporary safety measure. We later managed to entirely close the part of the hole that was not covered by the filter, by moving the filter towards the outside and using short floor panels from SR2 on the tank side.
 * We removed the SR3 PI from the filter tuning area and brought in the SR2 one.
 * We put magnets on the SR damper magnet ring to match the two Cu segments we were using.
 * We craned the SR3 PI into the AF, connected it to the security structure, and hooked the SF/... section and the SF damper magnet ring.
 * At first the F0 did not rise, and we realized that we had 2 kg less margin than we originally thought because we had not allowed for the PI-SF rod receptacle, the top disk which holds the yaw stepper mechanism, or the stepper itself.
 * However we were able to try the redesigned PI fishing rod, parts for which had just arrived. The optional strong CuBe spring in the new arrangement gave plenty of extra lift, so that we now have about 5 kg of margin. We did have to move the yoke to work around the problem that the CuBe spring tends to tilt the keystone, but we got it moving freely. We will also have to compress the blades some more to compensate for the extra stiffness, which caused the frequency to rise from 0.5 Hz to 0.9 Hz.
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==== Plan for week of 4/16 ====
 * Shoda-san at Mitaka
 * Tanioka-san at Kamioka Tue-Thu
 * Others at Kamioka full week
==== Plan for week of 7/2 ====
 * Mark, Hirata-san, Terrence at Kamioka Mon-Fri.
 * Enzo at Kamioka Mon-Wed.
 * Kozu-kun at Kamioka except Wed.
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 * Move SF and BF for SRM out of the way.
 * Check results of gluing.
 * Build 1xRM
 * Calibrate OSEMs.
 * Start SR3 Hang
  * Reset assembly frame crossbars to correct heights.
  * Center the optical table.
  * Align the assembly frame vertically.
  * Install IM ring and IM.
  * Hang optic.
  * Hang RM.
  * Cable RM OSEMs.		  * Continued tuning of filter in PI #3 for SR3.
 * Building and tuning of filter in PI #1 for SR2 (time permitting).
 * Lots of cable routing and testing.
 * Install geophones and arc weights.
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==== Plan for week of 4/23 ====
 * Shoda-san at Mitaka
 * Fujii-san at Mitaka?
 * Mark, Enzo at Kamioka
 * Hirata-san at Mitaka
 * Tanioka-san at Mitaka?		 ==== Plan for week of 7/9 ====
 * Mark, Enzo, Hirata-san, Kozu-kun, Terrence at Kamioka Mon-Fri.
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 * Clean parts (cable clamp bases, etc, etc).
 * Observe KAGRA Phase 1 operations, assist if problems arise.
 * Continue SR3 hang.

==== Plan for week of 4/30 ====
  * Golden Week!		  * Lock suspension.
 * Remove tank lid and raise LBB damper rings.
 * Crane suspension into tank.
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 * [[KAGRA/Subgroups/VIS/TypeB/March2018]]
 * [[KAGRA/Subgroups/VIS/TypeB/April2018]]
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 * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7779|JGW-L1807779-v1 Type B Schedule (SR)]]  * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7779|JGW-L1807779 Type B Schedule (SR)]]
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 * Fabian vacation, 3/26-4/27 (then gone).  * Kozu-kun: 7/4 Tokyo.
 * Enzo: 7/5-6 NAOJ Party, Mitaka.
 * Terrence: 8/24-26 f2f, then returns to Hong Kong.
 * Enzo: 9/14 JPS, 9/15 through 10/18 vacation in Chile.

Scraps of text for incorporation in the VIS Meeting Minutes

KAGRA/Subgroups/VIS/MeetingNAOJ

Type B (Mark)

Report for week of 6/18

  • We powered down the Type B racks as a precaution against possible loss of power during work on Tuesday, and later powered them up again.
  • We put a flange cover over the hole in the floor near the filter tuning area as a temporary safety measure. We later managed to entirely close the part of the hole that was not covered by the filter, by moving the filter towards the outside and using short floor panels from SR2 on the tank side.
  • We removed the SR3 PI from the filter tuning area and brought in the SR2 one.
  • We put magnets on the SR damper magnet ring to match the two Cu segments we were using.
  • We craned the SR3 PI into the AF, connected it to the security structure, and hooked the SF/... section and the SF damper magnet ring.
  • At first the F0 did not rise, and we realized that we had 2 kg less margin than we originally thought because we had not allowed for the PI-SF rod receptacle, the top disk which holds the yaw stepper mechanism, or the stepper itself.

  • However we were able to try the redesigned PI fishing rod, parts for which had just arrived. The optional strong CuBe spring in the new arrangement gave plenty of extra lift, so that we now have about 5 kg of margin. We did have to move the yoke to work around the problem that the CuBe spring tends to tilt the keystone, but we got it moving freely. We will also have to compress the blades some more to compensate for the extra stiffness, which caused the frequency to rise from 0.5 Hz to 0.9 Hz.

Plan for week of 7/2

  • Mark, Hirata-san, Terrence at Kamioka Mon-Fri.
  • Enzo at Kamioka Mon-Wed.
  • Kozu-kun at Kamioka except Wed.
  • --
  • Continued tuning of filter in PI #3 for SR3.
  • Building and tuning of filter in PI #1 for SR2 (time permitting).
  • Lots of cable routing and testing.
  • Install geophones and arc weights.

Plan for week of 7/9

  • Mark, Enzo, Hirata-san, Kozu-kun, Terrence at Kamioka Mon-Fri.
  • --
  • Lock suspension.
  • Remove tank lid and raise LBB damper rings.
  • Crane suspension into tank.

To-Do Lists, Schedule

Vacation Info

  • Kozu-kun: 7/4 Tokyo.
  • Enzo: 7/5-6 NAOJ Party, Mitaka.
  • Terrence: 8/24-26 f2f, then returns to Hong Kong.
  • Enzo: 9/14 JPS, 9/15 through 10/18 vacation in Chile.

KAGRA/Subgroups/VIS/TypeB/Minutes (last edited 2022-10-28 10:02:46 by fabian.arellano)