Differences between revisions 137 and 199 (spanning 62 versions)
⇤ ← Revision 137 as of 2017-04-14 13:36:43 →
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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:
 * Filed crane adapter ring to make it fit better on the hook.
 * Debugged the BF and SF LVDTs (the signal generator had lost its settings in the rack shutdown).
 * Debugged the TM-H4 OSEM problem (a "Type 3 extension cable had gone bad).
 * Weighed eyebolts used to lie the SF.
 * Shipped the old pico driver and joystick back to Mitaka for Eleonora.
 * Borrowed a second pico driver ("PR3") and set it and "BS" up in the rack.
 * Practiced driving the BF cap picos with the new drivers.
 * (With help from Miyo-kun) got the pico MEDM screens running.
 * Replace the temporary "PR3" driver with a new one "BS_BF", and renamed "BS" to "BS_IM".
 * Checked all the DIO connections to the LPCD and connected up the HPCDs. With help from Kokeyama-san we can now see all the drivers from EPICS.
 * Worked on balancing the BF/IRM/IM... section. Sometime during this work, the IM sank and would not come back to its proper position even with the fishing rod. We put a scale under the RM and found that the imbalance was 488 g. Using the fishing rod we got this down to 235 g, but we found that the direction of the stepper was not consistently related to the direction selected on the driver screen - we had previously noted that "left" was "up, but driving "up" the imbalance would decrease to 235 g and then start increasing again, indicating the stepper had bounced off some obstacle. (There was no obvious sound when this happened, unlike at the low end.)
 * We decided to give up on tuning the height of the IM with the fishing rod and to proceed with the test hang by locking the BF keystone at the desired height.
 * Hirata-san installed the PI fishing rod and magic wand, and did more work on changing the PI LVDT connectors from female to male.
 * Enzo made many edits to the circuit diagram, adding the DIO for the HPCDs and correcting minor mistakes.		 ==== 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 24: Line 32:
==== Plan for coming weeks ====
For more detail, see [[KAGRA/Subgroups/VIS/TypeB/ToDo]].		 ==== Plan for week of 10/16 ====
Kamioka: all but Mark, Hirata-san
Mitaka: Hirata-san
 * Work with alignment team.
 * SR procurement
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Week of 4/17:
 * Install temporary ballast mass in SF.
 * Lift SF/BF/... section and check total weight and SF balance.
 * Continue swap of PI LVDT connectors (female->male)
 * Start preparing LBB spring units.
Week of 4/24:
 * Crane in PI.
 * Connect SF/BF... section.
 * Temporarily remove PI and adjust SF ballast if necessary.
 		 ==== 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)