Differences between revisions 338 and 344 (spanning 6 versions)
Revision 338 as of 2018-10-25 15:59:54
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Revision 344 as of 2018-11-09 09:50:41
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Editor: MarkBarton
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==== Report for week of 10/22 ====
===== SRM =====
 * We borrowed the TM HPCDs from SR2 and SR3 so that SRM had HPCDs for IM-H, IM-V and GAS.
 * Fabian adjusted the last two OSEMs (IM-H2 and H3).
 * We closed the BF and weighed the BF/... section.
 * Fabian and Hirata-san routed all the BF/... cables via the BF cap (except for the four TM OSEM cables, where we're still waiting for extensions).
 * We built up the assembly frame and security structure to the SF level and craned in the SF.
 * We installed the SF-BF rod and flying saucer, and suspended the BF/... section. We will need about 600 g on the BF cap for balance and SF keystone height, which is as expected and not a problem.
 * Hirata-san collected a suitable CuBe spring and bracket parts from Type A. He ultrasonically cleaned the bracket and then installed the bracket and spring on the F0. The frequency increased from 0.5 Hz to 0.625 Hz, so he did another round of compression, from 30 mm to 31.3 mm.
 * Enzo soldered some short and/or broken cables to make longer cables that we need urgently. He got in touch with Yamamoto-san to arrange bringing them to Toyama University and ultrasonically cleaning them.
 * We pulled out cables running to the OMMT area that were used for the old OSEM/geophone testing setup and started a new geophone testing setup in the SR3 area using the optical table from the SR2 assembly frame.
 * Hirose-san reported results from his astigmatism test on the second SRM small optic and metal mass. With the tight shims (1.0 mm thickness, as used for the installed SRM) there was substantial astigmatism, but with the next looser available size (1.5 mm) there was no astigmatism but the optic is held very poorly and rattles. Hirose-san is ordering some intermediate thicknesses and will make a recommendation. However he will almost certainly suggest that we change the shims on the hanging SRM, so we need to think about whether that is feasible.
==== 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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===== SR2 =====
 * Akutsu-san collected the parts we will need for the SR2 OL so that Terrence can install it next week.
 * Hirata-san supervised the disassembly of the assembly frame. The pieces are now in the IMMT area, although we may need to move them again because they're a bit in the way.

==== Plan for week of 10/29 ====
 * Mark, Enzo, Hirata-san, Fabian and Terrence at Kamioka Mon-Fri.
===== SR2 =====
 * Set up OL.
 * Possibly do a measurement of how much torque is required on the F0 keystone to move the system in yaw. (This will help Sato-san choose a suitable stepper driver for the new design.)
 * Possibly add more arc weights, to get below 0.1 Hz.
===== SRM =====
 * Continue assembly.
 
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==== Plan for week of 10/29 ====
 * Mark, Enzo, Hirata-san and Fabian at Kamioka Mon-Fri (except Hirata-san to take compensation day Friday or Monday (TBD)).
==== Plan for week of 11/4 ====
 * Mark, Enzo, Hirata-san and Fabian at Kamioka Mon-Fri.
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 * Continue assembly.  * 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.
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==== Vacation/Visitor Info ====
 * Terrence: 10/29-11/2 at Kamioka.
==== 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.

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)