Differences between revisions 141 and 199 (spanning 58 versions)
⇤ ← Revision 141 as of 2017-05-12 13:38:40 →
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← Revision 199 as of 2017-10-13 14:18:17 → ⇥
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Deletions are marked like this. Additions are marked like this.
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At Kamioka (Mark, Fabian, Enzo, Perry, Hirata-san): At Kamioka (Mark, Ohishi-san, Fabian, Enzo, Hirata-san, Kozu-kun):
 * We couldn't count for a bubble level, so we removed a service port cover, searched again on top of the BF and found it.
 * We locked the LBB, put the table KOACH filters on the table. Ohishi-san removed the FC in two stages (AR side on Tue, HR side on Fri).
 * Ohishi-san measured the height of the SS and optic relative to the tank and found the optic was 3 mm low but the SS was 2 mm high. According to the GAS LVDTs, the suspension had not sagged but was 1.7 mm high.
 * Therefore we raised the suspension by 9 quarter-turns of the tank jacks (4.5 mm) to get the optic in the right position after (future) downward adjustment of the GAS filters.
 * We put the GAS LVDT calibration data as offsets and gains in the LVDTINF filters so the output would be height in µm relative to nominal.
 * We calibrated the IP LVDTs. We had worked around a mechanical interference due to the poor design of the old LVDTs by setting them to be 4 mm off-center with the IP locked centrally, but we discovered this was overkill and we have lost some linear range on the LVDT sensor in the opposite direction. If we have time we may move the LVDT bases 1-2 mm to a compromise position.
 * We worked with Simon to get the OL aligned and to learn the adjustment procedure.
 
At Mitaka (Hirata-san):
 * Hirata-san met with manufacturers and requested quotes.
 * Hirata-san made many assembly drawings for sections of the SR.
 * Hirata-san worked on compiling the SR inventory.
Line 9: Line 21:
 * We counted the used/broken/unused/need cables for Type B.
 * Hirata-san and Mark installed blades in three LBB blade units.
 * Hirata-san checked the LBB blade units to see how badly the blade tips were misaligned. The bases will need to be moved towards the clamp end by 21 mm. It is probably not feasible to turn the screw holes into slots, so an adapter part will need to be designed.
 * We checked that the new in-vacuum geophone cables that Takahashi-san had got for us were the proper new-style ones. (Thus we will need in-air descrambler cables.)
 * Shoda-san sent Enzo a document by Joris on the tuning of the LVDTs, so he stated working through it. He also researched the specifications of all the coils (PI and SF as well as BF.)
 * We found the damper magnets and the template for placing the magnets on the ring for the SF.
 * Hirata-san installed and wired up the PI yaw stepper. The vertical stepper still needs wiring, and the horizontal stepper wiring needs to be made vacuum-compatible.
 * We installed safety bars on the ±X side of the assembly frame about 3 m off the floor, so they are at waist height for a person standing on one of the tall ladders. The one on the +X side will be very good for safety where it is, but the one on the -X side will need re-doing: it is too close and not very securely attached because of interference from vacuum pump cabling.
 * We unlocked the inverted pendulum and experimented with adding weight. It was still stable with 4 layers of arc weights.
 * We also experimented with getting both the IP centered and the security structure vertical (so that the suspension hang centrally within it). We managed to get it all right with a combination of leveling the PI with the jacks and moving the IP with the fishing rods.
 * Adjusting the verticality of the SS had left the bottom of it off-center in the assembly frame, so we picked the entire system up with the crane and moved it in +Y and -X a few mm to re-center it.
 * We started to remove the PI so we could do various adjustments (check the SF LVDT, reconfigure the Cu damper, add the hex cable clamp on the rod and hang the magnet disk for the SF damper) but gave up when the PI-SF jammed in the SF.		 ==== Plan for week of 10/10 ====
Kamioka: Mark, Fabian, Enzo, Ohishi-san, Kozu-kun.
Mitaka: Hirata-san
Holiday Mon 10/9, Open Day prep Fri 10/13.<<BR>>
 * Tune IP, do LVDT/stepper calibration.
 * Remove First Contact, try OL.
 * TFs, final preparation for alignment in week of 10/16.
 * SR procurement.
 * Design ballast for LBB.
 * Continue design of improved PI yaw adjustment, also improved F0 FR.
Line 22: Line 32:
==== Plan for week of 10/16 ====
Kamioka: all but Mark, Hirata-san
Mitaka: Hirata-san
 * Work with alignment team.
 * SR procurement
Line 23: Line 38:
==== Plan for coming weeks ====
For more detail, see [[KAGRA/Subgroups/VIS/TypeB/ToDo]].

Week of 5/15:
 * Enzo from Tuesday 5/16 (driving test), rest of team from Monday.
 * Fix PI-SF rod jamming.
 * Remove PI and SF cap.
 * Continue debugging SF LVDT.
 * Reconfigure Cu damper ring on SF.
 * Add magnets to upper SF damper ring.
 * Add cable clamps on the PI (a few places are inaccessible when the PI is on the assembly frame).
 * Reinstall PI, this time with rods and damper ring.
 * Reinstall PI-SF rod, this time with hex cable clamp.
 * Prepare for PR2 bellows removal on 5/15 (move table with tools).
 * Cable/test PI horizontal LVDTs and steppers.
 * Install/cable/test geophones.
 		 ==== Vacation Info ====
Mark: 10/16-24

Scraps of text for incorporation in the VIS Meeting Minutes

KAGRA/Subgroups/VIS/MeetingNAOJ

Type B (Mark)

Past week report

At Kamioka (Mark, Ohishi-san, Fabian, Enzo, Hirata-san, Kozu-kun):

  • We couldn't count for a bubble level, so we removed a service port cover, searched again on top of the BF and found it.
  • We locked the LBB, put the table KOACH filters on the table. Ohishi-san removed the FC in two stages (AR side on Tue, HR side on Fri).
  • Ohishi-san measured the height of the SS and optic relative to the tank and found the optic was 3 mm low but the SS was 2 mm high. According to the GAS LVDTs, the suspension had not sagged but was 1.7 mm high.
  • Therefore we raised the suspension by 9 quarter-turns of the tank jacks (4.5 mm) to get the optic in the right position after (future) downward adjustment of the GAS filters.
  • We put the GAS LVDT calibration data as offsets and gains in the LVDTINF filters so the output would be height in µm relative to nominal.
  • We calibrated the IP LVDTs. We had worked around a mechanical interference due to the poor design of the old LVDTs by setting them to be 4 mm off-center with the IP locked centrally, but we discovered this was overkill and we have lost some linear range on the LVDT sensor in the opposite direction. If we have time we may move the LVDT bases 1-2 mm to a compromise position.
  • We worked with Simon to get the OL aligned and to learn the adjustment procedure.

At Mitaka (Hirata-san):

  • Hirata-san met with manufacturers and requested quotes.
  • Hirata-san made many assembly drawings for sections of the SR.
  • Hirata-san worked on compiling the SR inventory.

Plan for week of 10/10

Kamioka: Mark, Fabian, Enzo, Ohishi-san, Kozu-kun. Mitaka: Hirata-san Holiday Mon 10/9, Open Day prep Fri 10/13.

  • Tune IP, do LVDT/stepper calibration.
  • Remove First Contact, try OL.
  • TFs, final preparation for alignment in week of 10/16.
  • SR procurement.
  • Design ballast for LBB.
  • Continue design of improved PI yaw adjustment, also improved F0 FR.

Plan for week of 10/16

Kamioka: all but Mark, Hirata-san Mitaka: Hirata-san

  • Work with alignment team.
  • SR procurement

Vacation Info

Mark: 10/16-24

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