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| ==== 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. |
==== Report for the week of 2/25 ==== |
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| ==== 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. |
* Fabian monitored suspensions during the vent. * Terrence and Mark made lots of changes to the Guardians and RTMs: * * Fabian went inside the SRM chamber and diagnosed the problem that had appeared shortly before vent. It turned out to be yaw of the IP causing a payload cable to touch. He fixed it with the F0 yaw stepper. (He had tried this earlier without success but it turned out the problem was another dead output on the stepper driver.) * Terrence traced the geophone issue to a group of dead channels on the AA chassis. We tried replacing the chassis and it fixed not only the geophone issue but an issue in the ==== Plan for week of 2/25 ==== * Mark from Tuesday. * Enzo from Monday lunchtime. * Continue debugging stepper reset system. * Continue monitoring SRM yaw drift. * Install new RTMs and Guardian. * Debug SRM geophones. * Setup SRM and SR3 LEN OLs (low priority). * Work on Type B paper. |
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| ===== 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 ==== * [[KAGRA/Subgroups/VIS/TypeB/ToDoBS]] * [[KAGRA/Subgroups/VIS/TypeB/ToDoSR]] * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7779|JGW-L1807779 Type B Schedule (SR)]] ==== Vacation Info ==== * Terrence: 8/24-26 f2f, then returns to Hong Kong. * Enzo: 9/14 JPS, 9/15 through 10/8 vacation in Chile. |
==== Vacation/Travel Info ==== * Enzo vacation, 3/5 and possibly 3/6. * Enzo et al. Farewell Party, 3/7. * Enzo at JPS then final vacation, 3/13-29 * Terrence's last day, 3/29. |
Scraps of text for incorporation in the VIS Meeting Minutes
KAGRA/Subgroups/VIS/MeetingNAOJ
Type B (Mark)
Report for the week of 2/25
- Fabian monitored suspensions during the vent.
- Terrence and Mark made lots of changes to the Guardians and RTMs:
- Fabian went inside the SRM chamber and diagnosed the problem that had appeared shortly before vent. It turned out to be yaw of the IP causing a payload cable to touch. He fixed it with the F0 yaw stepper. (He had tried this earlier without success but it turned out the problem was another dead output on the stepper driver.)
- Terrence traced the geophone issue to a group of dead channels on the AA chassis. We tried replacing the chassis and it fixed not only the geophone issue but an issue in the
Plan for week of 2/25
- Mark from Tuesday.
- Enzo from Monday lunchtime.
- Continue debugging stepper reset system.
- Continue monitoring SRM yaw drift.
- Install new RTMs and Guardian.
- Debug SRM geophones.
- Setup SRM and SR3 LEN OLs (low priority).
- Work on Type B paper.
Vacation/Travel Info
- Enzo vacation, 3/5 and possibly 3/6.
- Enzo et al. Farewell Party, 3/7.
- Enzo at JPS then final vacation, 3/13-29
- Terrence's last day, 3/29.