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 * Mark, Fabian and Enzo continued BS Test Hang work:
  * We installed the BF fishing rod stepper motor adaptor cable.
  * We tried to install the BF LVDT cable but first we encountered trouble routing it, and then several wires broke at the D-Sub end.
  * We laid 6 in-air cables from the tank to the PR2 rank for BF and SF picos, steppers and LVDTs.
  * We lifted the BF/IRM/IM/RM/BS section to weigh it and check its balance.
   * It was 195.6 kg, which is 18 kg(!) less than the capacity of the SF.
   * There was a major imbalance in roll: with all four built-in trim masses moved up the +Y end, it still needed 270 g of extra trim mass to be level.
  * Unfortunately when we put the payload, the IM was slightly yawed and ended up on the horizontal EQ stop screws. This let the IM-BF maraging rod go slack, which disturbed the leveling of the IM (because every time it is picked up the maraging rod settles in a different place, giving a different suspension point). We may have to partly disassemble the IRM and rearrange the time mass on the the IM.
  * We shipped BS mirror box parts to Shoda-san and components for a new LVDT cable to Hirata-san.
  * We posed for pictures of the BS by a team from National Geographic.
 * Hirata-san
  * Did parts and fastener lists for the SR payload.
  * Did a 3D model with the SR suspension on the BS assembly frame (to help Mark make adjustments to the frame design).
  * Did 2D drawings of Fabian's concept for BS EQ stop parts.
  * Did a 3D model of a wire clamp with replaceable jaw parts (to avoid having to reuse parts with scars from pressure).
  * Did 2D drawings of a new wire clamps for on top of the BS and SR RMs.		 === 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.

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)