Differences between revisions 290 and 344 (spanning 54 versions)
⇤ ← Revision 290 as of 2018-06-01 11:52:28 →
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Editor: MarkBarton
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Deletions are marked like this. Additions are marked like this.
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==== Report for week of 5/28 ====
 * Enzo tested the LVDT driver repaired by Tanaka-san - it was fine.
 * Fujii-kun and Enzo finished assembling a batch of 4 geophones and took test data.
 * Hirata-san modified some Promec masses (drilling out the threads on 2 of 4 holes) so we could use two layers of them inside the BF.
 * Hirata-san installed maraging rod receptacles in the LBB damper rings, and in the bottom of PIs #3 and #1 (for the SF damper rings).
 * After consulting with various people, Hirata-san installed the second half of the LBB top ring in the chamber, simply omitting the pillar and screw associated with the badly threaded hole.
 * Hirata-san took delivery of the screws for the LBB blade units, made up 9 blade units and installed 6 of them on PI #3 and #1 (for SR3 and SR2).
 * Hirata-san made up a set of PI cable clamps and installed them on PI #3 (for SR3).
 * Hirata-san removed the prototype blades from PI #3 to get ready for testing the final blades.
 * We located the #355 disk and #356 poles for the next level of the security structure up to the SF and installed the poles.
 * We installed ballast mass in the BF. After some trial and error we settled on 16 Promec masses (7.1 kg) inside the BF and 5 D1808104-4 and 3 D1808104-5 masses (540 g) on the cap.
 * Enzo and Fujii-kun did several rounds of TFs on the BF/... section of the suspension and debugged a problem with dewhitening filters not being installed in the OSEMINF filter bank.
 * Enzo installed damping filters for the IM OSEMs.		 ==== Report for week of 10/29 ====
 * SRM
  * Enzo realized that he could cover the next round of needed cables with more cable soldering and did another batch. Because Yamamoto-san's lab was running low on isopropanol, Hirata-san washed them with ethanol at Mozumi.
  * Enzo worked out the optimum output resistance for the LPCDs to substitute for HPCDs with the horizontal IM OSEMs. The value was quite close to that already chosen for modified LPCDs by the cryogenic group, so we're going to standardize. The modified LPCDs will have to be operated with the internal watchdog disabled for now because it was hard-wired to 2 mA.
  * Fabian finished adding the TM OSEM cables out to the rack and tested them.
  * We ran DC power and network to the second SRM stepper driver. We still need to get one more DC power cable to replace one we borrowed from SR3. We added the remaining steppers to the Python driver and MEDM screen.
  * We reconfigured the top of the assembly frame in preparation for the PI (removing crossbars and moving jacks down).
  * Hirata-san put the magnets on the SF damper and we hooked it to the PI, craned the PI into the assembly frame and joined it to the security structure.
  * We installed the F0-SF rod and flying saucer and suspended the SF/... section. We had plenty of spare load capacity, so we changed the CuBe spring to a weaker one and put 2.3 kg of ballast on the SF cap. This leaves 1.2 kg reserve for cables and an F0 yaw stepper mechanism.
  * We reduced the trim mass on the BF to compensate for the mass of the TM OSEM cables.
  * We measured all the bounce frequencies.
  * Hirata-san put magnets on the LBB damper magnet ring, put the pieces into the tank and assembled them into a sandwich ready for craning.
 * SR2
  * Hirata-san unclamped the LBB damper rings and suspended the LBB. It still needs ballast mass and is currently sitting high, with the blades at their upper stops.
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==== Plan for week of 6/4 ====
 * Mark, Enzo, Hirata-san, Kozu-kun at Kamioka Tue-Fri. (Mon is NAOJ medical checkup.)
 * --
 * Cable and test BF cap picos.
 * Crane in security structure disk at SF level.
 * Crane in SF and remove cap.
 * Hook BF and adjust total ballast.
 * Route cables through SF-BF flying saucer up to bottom of SF.
 * Adjust BF trim mass.
 * Readjust payload.
 * Take TFs.
 * Characterize final F0 blades.

==== Plan for week of 6/11 ====
 * Mark Enzo, Hirata-san, Kozu-kun at Kamioka Tue-Fri (Mon is compensation day for f2f.)
 * --
 * Any unfinished SR3 SF/... stuff.
 * Add budgeted ballast mass to SF and weigh SF/... section.
 * Cable, test SF LVDT and FR.
 * Rebuild F0 #3 for SR3.
 * Park F0 #1 (for SR2) in top of SR3 assembly frame.
 * Move F0 #3 behind SR3.
  
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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)]]

==== Plan for week of 11/4 ====
 * Mark, Enzo, Hirata-san and Fabian at Kamioka Mon-Fri.
===== SRM =====
 * Main sequence
  * Add magnets to SF damper.
  * Install #353 poles
  * Move NB-03 jacks down.
  * Crane PI into AF.
  * Install F0-SF rod (#331) and flying saucer.
  * Route SF/... cables up to underside of F0.
  * Do vertical height budget.
  * Adjust SF trim mass for balance and keystone height.
  * Cable/test IP LVDTs.
  * Cable/test IP FRs.
 * LBB
  * Move KOACH filters
  * Put LBB damper rings in tank.
  * Set tank jacks to nominal height.

==== Plan for week of 11/11 ====
 * Mark, Enzo, Hirata-san and Fabian at Kamioka Mon-Fri.
===== SRM =====
 * Unlock IP and center roughly.
 * Calibrate IP LVDTs.
 * Check/adjust alignment of SS.
 * Add arc weights and geophones (or extra mass equivalent to geophones).
 * Cable/test geophones.
 * Improve centering/tuning of IP and SS alignment.

==== Plan for week of 11/18 ====
 * Friday 11/23 is Labor Thanksgiving Day.
 * Mark, Enzo, Hirata-san and Fabian at Kamioka Mon-Thu.
===== SRM =====
 * Unlock IP and center roughly.
 * Calibrate IP LVDTs.
 * Check/adjust alignment of SS.
 * Add arc weights and geophones (or extra mass equivalent to geophones).
 * Cable/test geophones.
 * Improve centering/tuning of IP and SS alignment.
 * Crane into tank.
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 * Hirata-san at Mitaka, Mon 11/19.

Scraps of text for incorporation in the VIS Meeting Minutes

KAGRA/Subgroups/VIS/MeetingNAOJ

Type B (Mark)

Report for week of 10/29

  • SRM
    • Enzo realized that he could cover the next round of needed cables with more cable soldering and did another batch. Because Yamamoto-san's lab was running low on isopropanol, Hirata-san washed them with ethanol at Mozumi.
    • Enzo worked out the optimum output resistance for the LPCDs to substitute for HPCDs with the horizontal IM OSEMs. The value was quite close to that already chosen for modified LPCDs by the cryogenic group, so we're going to standardize. The modified LPCDs will have to be operated with the internal watchdog disabled for now because it was hard-wired to 2 mA.
    • Fabian finished adding the TM OSEM cables out to the rack and tested them.
    • We ran DC power and network to the second SRM stepper driver. We still need to get one more DC power cable to replace one we borrowed from SR3. We added the remaining steppers to the Python driver and MEDM screen.
    • We reconfigured the top of the assembly frame in preparation for the PI (removing crossbars and moving jacks down).
    • Hirata-san put the magnets on the SF damper and we hooked it to the PI, craned the PI into the assembly frame and joined it to the security structure.

    • We installed the F0-SF rod and flying saucer and suspended the SF/... section. We had plenty of spare load capacity, so we changed the CuBe spring to a weaker one and put 2.3 kg of ballast on the SF cap. This leaves 1.2 kg reserve for cables and an F0 yaw stepper mechanism.

    • We reduced the trim mass on the BF to compensate for the mass of the TM OSEM cables.
    • We measured all the bounce frequencies.
    • Hirata-san put magnets on the LBB damper magnet ring, put the pieces into the tank and assembled them into a sandwich ready for craning.
  • SR2
    • Hirata-san unclamped the LBB damper rings and suspended the LBB. It still needs ballast mass and is currently sitting high, with the blades at their upper stops.

To-Do Lists, Schedule

Plan for week of 11/4

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

SRM
  • Main sequence
    • Add magnets to SF damper.
    • Install #353 poles
    • Move NB-03 jacks down.
    • Crane PI into AF.
    • Install F0-SF rod (#331) and flying saucer.
    • Route SF/... cables up to underside of F0.
    • Do vertical height budget.
    • Adjust SF trim mass for balance and keystone height.
    • Cable/test IP LVDTs.
    • Cable/test IP FRs.
  • LBB
    • Move KOACH filters
    • Put LBB damper rings in tank.
    • Set tank jacks to nominal height.

Plan for week of 11/11

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

SRM
  • Unlock IP and center roughly.
  • Calibrate IP LVDTs.
  • Check/adjust alignment of SS.
  • Add arc weights and geophones (or extra mass equivalent to geophones).
  • Cable/test geophones.
  • Improve centering/tuning of IP and SS alignment.

Plan for week of 11/18

  • Friday 11/23 is Labor Thanksgiving Day.
  • Mark, Enzo, Hirata-san and Fabian at Kamioka Mon-Thu.

SRM
  • Unlock IP and center roughly.
  • Calibrate IP LVDTs.
  • Check/adjust alignment of SS.
  • Add arc weights and geophones (or extra mass equivalent to geophones).
  • Cable/test geophones.
  • Improve centering/tuning of IP and SS alignment.
  • Crane into tank.

Vacation Info

  • Hirata-san at Mitaka, Mon 11/19.

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