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⇤ ← Revision 128 as of 2017-03-03 13:29:51 →
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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 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.
 * 		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.
 
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 * Everyone (Mark, Fabian, Enzo, Hirata-san) at Kamioka, Monday-Thursday.
 * Work on electronics, possibly suspend and weigh BF.		  * 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.
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 * Add SF and suspend BF.  * Prepare for PI installation.

Scraps of text for incorporation in the VIS Meeting Minutes

KAGRA/Subgroups/VIS/MeetingNAOJ

Type B (Mark)

Past week report

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.

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.

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