Differences between revisions 129 and 187 (spanning 58 versions)
⇤ ← Revision 129 as of 2017-03-03 13:43:28 →
Size: 2021
Editor: MarkBarton
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← Revision 187 as of 2017-09-08 13:41:35 → ⇥
Size: 1973
Editor: MarkBarton
Comment:
Deletions are marked like this. Additions are marked like this.
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At Kamioka (Mark, Fabian, Enzo, Hirata-san):
 * With help from Kokeyama-san and Miyakawa-san, we debugged a problem with the real-time model freezing, which turned out to be the IO chassis shutting down because of brownout condition from an overloaded AC circuit. A combination of extra boxes added to the rack, plus surge current from the air shower could draw the full 20 A limit of the circuit. Awai-san ran a cable to a separate circuit and we moved the IO chassis onto that.
 * We got the stepper motor cabling and driver working, and tested the BF fishing rod stepper motor.
 * We got the LVDT cabling, driver and associated parts of the real-time model working.
 * We suspended the BF and payload to check the weight and balance after adding balance mass. The weight was spot-on and the balance was OK (about as expected and close enough to be corrected). However the height and balance of the IM was disturbed again.
 * Fabian worked on the redesign of the ballast masses.
 * Hirata-san found all the parts for the SF and the SF section of the security structure, and prepared the SF. However we then removed the Cu ring from the top cap for recleaning.
 * We worked with Sawada-san to get the wheels removed from the large stepladders so that could be put closer to the assembly frame for comfort and safety.
 * We cleaned up after a water leak from the ceiling.
 * We straightened the hexagonal poles in the bottom level of the security structure, in preparation for adding the new EQ stops for the RM.		 At Kamioka (Mark, Ohishi-san, Fabian, Enzo, Hirata-san, Yoshioka-kun, Kozu-kun):
 * We craned out the SF temporarily and retrieved the lost PEEK cable clamp collet from the BF.
 * We installed the BF.
 * We routed cables from the BF via the hex cable clamp to the SF level.
 * We adjusted the BF trim mass for pitch, roll and vertical, and got the IRM hanging symmetrically around the IM.
 * We adjusted all the IRM OSEMs laterally and in/out.
 * We calibrated the SF LVDT and tested the SF FR stepper.
 * We suspended the SF/... section and weighed it but found the old 7-mm maraging rod adapter did not hold it at the center, so we chad to lift it with slings and could not accurately trim it for pitch/roll.
 * We craned in the PI with the SF damper ring hanging from it.
 * We suspended the SF successfully from the PI and unlocked the F0 keystone to check the mass budget. We needed about 1.5 kg extra, which is about right.
 * However we had to leave out the F0-SF hex cable clamp because of a bad thread on the inside of the cap. Hirata-san will make a new cap by enlarging the 7-mm hole in an old cap to 8 mm.
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==== Plan for coming weeks ====
Next week:
 * Everyone (Mark, Fabian, Enzo, Hirata-san) at Kamioka, Monday-Friday.
 * Readjust height and balance of BF+payload, add SF.
 * Get picomotor driver working.
Week after next:
 * Everyone (Mark, Fabian, Enzo, Hirata-san) at Kamioka, Monday-Friday.
 * Continue adding SF and suspend BF.		 ==== Plan for week of 9/4 ====
Mark, Fabian, Enzo (Tue-Fri), Ohishi-san, Hirata-san, Yoshioka-kun (Tue, Wed, Fri), Kozu-kun (Thu, Fri)
 * Retrieve PEEK piece from BF.
 * Crane SF back in.
 * Suspend BF/IRM/IM/RM/BS.
 * Test SF FR.
 * Calibrate SF LVDT.
 * Install SF cap; route cables.
 * Lift and weigh SF/BF/IRM/IM/RM/BS.
 * Adjust SF ballast.

==== Plan for week of 9/13 ====
Mark (except Wed), Fabian (except ASJ), Enzo, Ohishi-san, Hirata-san, Yoshioka-kun (Tue, Wed, Fri), Kozu-kun
 * Prepare magnet ring.
 * Bring in PI.
 * Route cables.
 * Suspend SF/..., adjust tilt of SF and total mass.
 * Adjust damper gap.
  

==== 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, Yoshioka-kun, Kozu-kun):

  • We craned out the SF temporarily and retrieved the lost PEEK cable clamp collet from the BF.
  • We installed the BF.
  • We routed cables from the BF via the hex cable clamp to the SF level.
  • We adjusted the BF trim mass for pitch, roll and vertical, and got the IRM hanging symmetrically around the IM.
  • We adjusted all the IRM OSEMs laterally and in/out.
  • We calibrated the SF LVDT and tested the SF FR stepper.
  • We suspended the SF/... section and weighed it but found the old 7-mm maraging rod adapter did not hold it at the center, so we chad to lift it with slings and could not accurately trim it for pitch/roll.
  • We craned in the PI with the SF damper ring hanging from it.
  • We suspended the SF successfully from the PI and unlocked the F0 keystone to check the mass budget. We needed about 1.5 kg extra, which is about right.
  • However we had to leave out the F0-SF hex cable clamp because of a bad thread on the inside of the cap. Hirata-san will make a new cap by enlarging the 7-mm hole in an old cap to 8 mm.

Plan for week of 9/4

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

  • Retrieve PEEK piece from BF.
  • Crane SF back in.
  • Suspend BF/IRM/IM/RM/BS.
  • Test SF FR.
  • Calibrate SF LVDT.
  • Install SF cap; route cables.
  • Lift and weigh SF/BF/IRM/IM/RM/BS.
  • Adjust SF ballast.

Plan for week of 9/13

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

  • Prepare magnet ring.
  • Bring in PI.
  • Route cables.
  • Suspend SF/..., adjust tilt of SF and total mass.
  • Adjust damper gap.

Vacation Info

Mark: 10/16-24

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