Differences between revisions 7 and 200 (spanning 193 versions)
⇤ ← Revision 7 as of 2016-04-21 14:52:06 →
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 * Hirata-san produced a near-final Inventor assembly of the BS on the assembly frame, for use in writing the assembly procedure.
  * Includes assembly frame modifications suggested by Mirapro, including feet, wheels, lifting eyes, thicker crossbars under BF, IM etc.
  * Includes final rail system except for interface plate to mirror box.
  * Includes full PI with ballast masses.
  * Includes cable clamps.
  * Includes correct versions of BF and SF.
  * Includes new BF pushrod parts to work around different placement of blade screws in new version of BF.
  * Includes cleanbag support bars.
  * Includes key parts of mirror box (enough to check for interference) - needs more work.
  * Does not include various invisible duplicate assemblies.
 * Got status from Miyakawa-san on electronics - there should be enough of the boxes AEL is supplying.
 * Cleanbag design was finalized; Aso-san is ordering: [[attachment:160419-ﾁｬﾝﾊﾞｰｶﾊﾞｰⅡ型.pdf]]
 * Quote for flags and prisms was received, but expensive - may drop rigid flag design.
 * The mirror box will require only very minor modifications for flags and prisms - Tatsumi-san will arrange immediately.
 * Fabian worked on understanding Sekiguchi-san's control design to help decide optimum wire thickness.
 * Mark worked on install procedure and schedule.
 * Takahashi-san enquired with NIKHEF about oscillator cards for LVDT chassis - lead time would be 3-4 months.
 * 		=== Type B (Mark) ===
==== Past week report ====
At Kamioka (Mark, Ohishi-san, Fabian, Enzo, Hirata-san, Kozu-kun):
 * We couldn't account for a bubble level, so we removed a service port cover, searched again on top of the BF and found it.
 * We put the table KOACH filters on the table. Ohishi-san then 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) so that the optic would be 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.
 * Mark updated Sekiguchi-san's SUMCON to allow for comments to be entered next to all values (75% finished).
 * Kozu-kun worked on deriving the diagonalization matrices for the IP FRs.
 
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 10/16 ====
Kamioka: all but Mark
 * Remove sticker residue and permanent marker writing on PI.
 * Fix broken and unreliable connections on IP LVDTs.
 * Wipe any rust from around IP LVDTs.
 * (If Enzo thinks it necessary and there's time) adjust IP LVDT mechanical offsets to maximize usable range and recalibrate.
 * Add IP LVDT gains and offsets to IP_LVDTINF filter blocks.
 * Calibrate IP LVDT actuation against IP LVDT sensing.
 * Install damping filters for IP LVDTs.
 * Adjust gains and debug damping for IM OSEMs and GAS LVDTs.
 * Modify IP LVDT damping filters to include set point.
 * Install and debug IP LVDT and geophone diagonalization matrices.
 * (Time permitting) Try adding mass to IP.
 * Work with alignment team.
 * Work with Mirapro on SR LBB and tank installation (Hirata-san, from Wed)
 * Work with Miyo-kun to get user interface for stepper motors.
 * Calibrate IP FR actuation against IP LVDT sensing.
 * SR procurement.

==== 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 account for a bubble level, so we removed a service port cover, searched again on top of the BF and found it.
  • We put the table KOACH filters on the table. Ohishi-san then 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) so that the optic would be 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.
  • Mark updated Sekiguchi-san's SUMCON to allow for comments to be entered next to all values (75% finished).
  • Kozu-kun worked on deriving the diagonalization matrices for the IP FRs.

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 10/16

Kamioka: all but Mark

  • Remove sticker residue and permanent marker writing on PI.
  • Fix broken and unreliable connections on IP LVDTs.
  • Wipe any rust from around IP LVDTs.
  • (If Enzo thinks it necessary and there's time) adjust IP LVDT mechanical offsets to maximize usable range and recalibrate.
  • Add IP LVDT gains and offsets to IP_LVDTINF filter blocks.
  • Calibrate IP LVDT actuation against IP LVDT sensing.
  • Install damping filters for IP LVDTs.
  • Adjust gains and debug damping for IM OSEMs and GAS LVDTs.
  • Modify IP LVDT damping filters to include set point.
  • Install and debug IP LVDT and geophone diagonalization matrices.
  • (Time permitting) Try adding mass to IP.
  • Work with alignment team.
  • Work with Mirapro on SR LBB and tank installation (Hirata-san, from Wed)
  • Work with Miyo-kun to get user interface for stepper motors.
  • Calibrate IP FR actuation against IP LVDT sensing.
  • SR procurement.

Vacation Info

Mark: 10/16-24

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