Differences between revisions 130 and 192 (spanning 62 versions)
⇤ ← Revision 130 as of 2017-03-10 13:40:53 →
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← Revision 192 as of 2017-09-22 13:57:37 → ⇥
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Editor: MarkBarton
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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):
 * We removed the BF cap to debug the stepper motor. We checked the cabling but didn't find a problem. Eventually toggling the power to the driver box seemed to fix it.
 * We got the wheels removed from the two tall stepladders.
 * We started to rebalance the IM but came to realize that it was unstable for more than trivial pitch and roll (and had been for some time). We moved trim mass from top to bottom and it became unconditionally stable.
 * We rebalance the IM, put back the IRM and adjusted the OSEMs.
 * We took a successful TF in IM-L.
 * We added the security structure ring for below the SF and then added the SF. We noticed the cap is on at the wrong angle (so the keystone lock screws are inaccessible) but we can easily fix that.		 At Kamioka (Mark, Ohishi-san, Fabian, Enzo, Hirata-san, Yoshioka-kun, Kozu-kun):
 * We put lock nuts on the F0 FR and calibrated the F0 LVDT against FR position and keystone height.
 * Enzo traced the issue with the geophones to a specific cable.
 * We measured the BF and F0 GAS resonant frequencies.
 * We adjusted the spacing of the SR damper.
 * We double-checked the BS pitch with the OL.
 * We debugged the PI yaw mechanism. We managed to get the return spring properly adjusted, but the stepper motor tends to jam because of the strange design.
 * '''We prepared the suspension for lifting and craned it into the tank.'''
 * Hirata-san fixed an issue with one of the nailheads on the LBB intermediate ring support rods not properly seating, by removing the rod and reinstalling it upside down (with the problem nailhead in a less critical position).
 * Enzo and team moved all the in-air cables from the assembly frame to the tank.
 * Fabian and Ohishi-san unlocked the bottom section of the suspension and got it hanging freely.
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==== Plan for coming weeks ====
Next week:
 * Everyone (Mark, Fabian, Enzo, Perry Hirata-san) at Kamioka, Monday-Friday except for Hirata-san Wednesday-Friday).
 * Finish SF installation.
 * Finish BF cabling, hang BF/IRM/IM/RM/BS from SF and confirm weight matches load capacity.
 * Re-trim BF as necessary.
 * Get picomotor driver working.
Week after next:
 * Everyone (Mark, Fabian, Enzo, Hirata-san) at Kamioka, Monday-Friday.
 * Prepare for PI installation.		 ==== Plan for week of 9/25 ====
Mark, Fabian, Enzo (Mon, Tue), Ohishi-san (Tue, Fri), Hirata-san, Yoshioka-kun (Tue, Wed, Fri), Kozu-kun
 * Finish moving in-air cabling and feedthroughs and reconnect in-vacuum cables (through Cu O-rings).
 * Unlock rest of suspension and readjust.
 * Debug electronics.
 * Unclamp LBB ring "sandwich" so LBB Cu ring is suspended on upper rods.
 * Install LBB lower rods and hook LBB.
 * Adjust LBB damper Cu-magnet gap.
 * Measure required ballast for LBB.
 * Remove First Contact, try OL.
 * Prepare for SR2 work.

==== Plan for week of 10/2 ====
Kamioka: Mark, Enzo, Fabian, Ohishi-san.
 * TFs etc.
Mitaka: Hirata-san?
 * SF design/purchasing.

==== Vacation Info ====
Mark: 10/16-24
Enzo: 9/27-29

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, Yoshioka-kun, Kozu-kun):

  • We put lock nuts on the F0 FR and calibrated the F0 LVDT against FR position and keystone height.
  • Enzo traced the issue with the geophones to a specific cable.
  • We measured the BF and F0 GAS resonant frequencies.
  • We adjusted the spacing of the SR damper.
  • We double-checked the BS pitch with the OL.
  • We debugged the PI yaw mechanism. We managed to get the return spring properly adjusted, but the stepper motor tends to jam because of the strange design.

  • We prepared the suspension for lifting and craned it into the tank.

  • Hirata-san fixed an issue with one of the nailheads on the LBB intermediate ring support rods not properly seating, by removing the rod and reinstalling it upside down (with the problem nailhead in a less critical position).
  • Enzo and team moved all the in-air cables from the assembly frame to the tank.
  • Fabian and Ohishi-san unlocked the bottom section of the suspension and got it hanging freely.

Plan for week of 9/25

Mark, Fabian, Enzo (Mon, Tue), Ohishi-san (Tue, Fri), Hirata-san, Yoshioka-kun (Tue, Wed, Fri), Kozu-kun

  • Finish moving in-air cabling and feedthroughs and reconnect in-vacuum cables (through Cu O-rings).
  • Unlock rest of suspension and readjust.
  • Debug electronics.
  • Unclamp LBB ring "sandwich" so LBB Cu ring is suspended on upper rods.
  • Install LBB lower rods and hook LBB.
  • Adjust LBB damper Cu-magnet gap.
  • Measure required ballast for LBB.
  • Remove First Contact, try OL.
  • Prepare for SR2 work.

Plan for week of 10/2

Kamioka: Mark, Enzo, Fabian, Ohishi-san.

  • TFs etc.

Mitaka: Hirata-san?

  • SF design/purchasing.

Vacation Info

Mark: 10/16-24 Enzo: 9/27-29

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