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Revision 300 as of 2018-06-29 11:17:24
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Revision 303 as of 2018-07-13 13:30:17
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==== 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.
==== Report for week of 7/9 ====
 * We cleaned up after the heavy rain. There was no significant damage but some cardboard boxes of parts got wet and the contents needed to be moved to other containers and the boxes discarded. Water collected on the SR2 crane slot cover and had to be vacuumed away before the cover could be opened. A new section of corrugated roof was installed to minimize the problem for the future.
 * Enzo and team got all of the in-vacuum and in-air cables for the SF/... and PI properly routed and tested except (so far) for the geophones.
 * Hirata-san and team finished tuning of the F0 for SR2 and moved the PI into the SR2 cleanbooth. It turns out to be about 8 kg weaker than for SR3, whereas the SR2 chain is only 3 kg lighter, so we will have to do some combination of decompression, removing Cu segments and using a stronger CuBe spring (e.g., a Type A F0 FR blade instead of the F2 one in SR3). We closed the floor in the SRM area for safety, but we will probably reopen it as soon as next week for the SRM F0 build.
 * Hirata-san opened the SR3 tank, craned the LBB damper ring sandwich up to the top of the tank and suspended it.
 * Enzo and team corrected a lot of flipped connections on the SR3 PI LVDTs (primary<->secondary on the horizontal, primary<->actuation on the F0).
 * We added the arc weights and geophones and re-centered the IP. It seems stable and very soft, which is good.
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 * Mark, Enzo, Hirata-san, Kozu-kun, Terrence at Kamioka Mon-Fri.
 * --
==== Plan for week of 7/16 ====
 * Monday 7/16 is Sea Day.
 * Mark, Enzo, Hirata-san, Kozu-kun, Terrence at Kamioka Tue-Fri.
===== Main Sequence =====
 * Check/restore alignment of payload, especially optic pitch.
 * Testing, TFs.
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 * Remove tank lid and raise LBB damper rings.
 * Crane suspension into tank.
 * Crane into tank.
 * Unlock suspension.
 * Rearrange cables.
 * Test.

===== F0/LBB Stuff =====
 * Install correct IP in PI #2.
 * Crane PI #2 to second floor.
 * Rebuild top filter of PI #2.
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 * Kozu-kun: 7/4 Tokyo.
 * Enzo: 7/5-6 NAOJ Party, Mitaka.

Scraps of text for incorporation in the VIS Meeting Minutes

KAGRA/Subgroups/VIS/MeetingNAOJ

Type B (Mark)

Report for week of 7/9

  • We cleaned up after the heavy rain. There was no significant damage but some cardboard boxes of parts got wet and the contents needed to be moved to other containers and the boxes discarded. Water collected on the SR2 crane slot cover and had to be vacuumed away before the cover could be opened. A new section of corrugated roof was installed to minimize the problem for the future.
  • Enzo and team got all of the in-vacuum and in-air cables for the SF/... and PI properly routed and tested except (so far) for the geophones.
  • Hirata-san and team finished tuning of the F0 for SR2 and moved the PI into the SR2 cleanbooth. It turns out to be about 8 kg weaker than for SR3, whereas the SR2 chain is only 3 kg lighter, so we will have to do some combination of decompression, removing Cu segments and using a stronger CuBe spring (e.g., a Type A F0 FR blade instead of the F2 one in SR3). We closed the floor in the SRM area for safety, but we will probably reopen it as soon as next week for the SRM F0 build.

  • Hirata-san opened the SR3 tank, craned the LBB damper ring sandwich up to the top of the tank and suspended it.
  • Enzo and team corrected a lot of flipped connections on the SR3 PI LVDTs (primary<->secondary on the horizontal, primary<->actuation on the F0).

  • We added the arc weights and geophones and re-centered the IP. It seems stable and very soft, which is good.

Plan for week of 7/9

Plan for week of 7/16

  • Monday 7/16 is Sea Day.
  • Mark, Enzo, Hirata-san, Kozu-kun, Terrence at Kamioka Tue-Fri.

Main Sequence
  • Check/restore alignment of payload, especially optic pitch.
  • Testing, TFs.
  • Lock suspension.
  • Crane into tank.
  • Unlock suspension.
  • Rearrange cables.
  • Test.

F0/LBB Stuff
  • Install correct IP in PI #2.
  • Crane PI #2 to second floor.
  • Rebuild top filter of PI #2.

To-Do Lists, Schedule

Vacation Info

  • Terrence: 8/24-26 f2f, then returns to Hong Kong.
  • Enzo: 9/14 JPS, 9/15 through 10/8 vacation in Chile.

KAGRA/Subgroups/VIS/TypeB/Minutes (last edited 2022-06-24 12:23:36 by fabian.arellano)