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==== Report for week of 3/13 ====
At Kamioka (Mark, Fabian, Enzo, Perry, Hirata-san):
 * We took a full set of TFs with the BF stationary but the IRM, IM, RM and TM all hanging.
 * We marked peeling or damaged areas on the clean booth floor for Furuta-san.
 * We installed the SF, measuring its weight in the process.
 * We found the crossbars supporting the SF jacks were too high to allow the SF ring to sit on the pillars while also being partially supported by the jacks. (This was an issue with the 3D CAD - the model of the NB-01 jack had a lower minimum height than reality.) We lowered the crossbars by 5 mm and put thicker spacers (12 mm instead of 3 mm) on top of the jacks supporting the SF and everything worked well.
 * We installed newly cleaned L-brackets under the BF and SF.
 * We installed a new-style cable clamp under the SF. (This was easier with the SF on the security structure, so we had not done it earlier.)
 * We installed the SF-BF rod and hex cable clamp.
 * We suspended the BF/IRM/IM/RM/BS section and found it was light, presumably because it had been trimmed according to the Promec measurement of the SF, not Hirata-san's later value.
 * We added extra ballast mass corresponding to the difference and found the BF section floated at a good height.
 * We moved trim mass around on the BF until it hung level, and adjusted the IRM and OSEMs until the IRM-IM EQ stops were well-centered and all the OSEMs were centered laterally and mid-range.
 * We ran 11 extra 20-m in-air cables from the tank towards the rack. (We will need to add 10-m extensions.)
 * We connected most of the cables to the vacuum flanges with screws and anti-feedthrough adapters. (Some remain to be done.)
 * We debugged a 900 Hz ringing in the BF LVDT, which turned out to be because the damping was enabled without appropriate filters or gains.
 * We debugged excess noise in the TM-H3 OSEM, which turned out to be mostly due to a faulty cable. However we worry that some of it may be due to some extensions made of non-vacuum-compatible ribbon cable which we added because the TM-H2 and -H3 OSEM cables are too short.
 * We installed new security structure parts at the RM level.
 * We found all the parts for the lower breadboard suspension, including the blades, blade bases, associated cable clamps etc. We also found the jigs for installing the blades.
 * Fabian finalized the BF ballast mass design and started on the SF.
==== Report for week of 3/21 ====
At Kamioka (Mark, Fabian, Enzo, Perry, Hirata-san):
 * We took a full set of TFs with the SF stationary but the BF, IRM, IM, RM and TM all hanging.
 * We also did a TF from BF LVDT actuation and confirmed that it was working.
 * We got SUMCON running on Perry's computer and worked out how to do cut-down versions of Fabian's full Type-B model corresponding to the various partial configurations we have data for.		 ==== Report for week of 1/15 ====
 * We swapped in the other available BF, and it was rather better: only 0.3 mm of keystone tilt rather than 1.3 mm. We will use it for the SR2 and then think about whether we want to use or rebuild the original one.
 * We finished the preparation of the second BF, setting the yoke, adding the new-style cable clamps etc.
 * We changed the 1.6 mm sockets on the BF LVDT cable to 1.0 mm ones to match the pins on the LVDT wires. The specification of the cable in D1503901 was apparently wrong. We will update it (today) before doing the cable order for the SR3 and SRM.
 * We updated the BS real-time model and screens, adding support for a damping filter common to both the OL-TM and OL-IM paths, per Izumi-san's suggestion in G1807653.
 * We set up the router for the SR2 rack and got the SR2_IM pico driver and both stepper motors on the network (the SR2_BF pico is still on order).
 * We did prep for the top filter test:
  * We received, unpacked and temporarily stored a shipment of weights and other parts.
  * We removed the top crossbars from the SR3 assembly frame.
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==== Plan for coming weeks ====
For more detail, see [[KAGRA/Subgroups/VIS/TypeB/ToDo]].		  
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Week of 3/21:
 * Lots of electronics: BF picos, SF LVDT and stepper, routing of in-vac cabling past SF, in-air cabling for PI.
 * Pick up and weigh entire system from SF down.
 * Prepare PI: reattach LVDT double coils, install FR and magic wand.
 * Prepare LBB blade units.
 * Clear floor for re-coating.		 ==== Plan for week of 1/29 ====
 * Enzo at Mitaka 1/29 and most of 1/30, then vacation.
 * Kozu-kun away.
 * All others at Kamioka.
 * Make in-air pico adapter cables.
 * Test IM picos and BF yaw pico.
 * Test FR.
 * Calibrate LVDT.
 * Get screws for ballast mass from Takahashi-san.
 * Install ballast mass in BF.
 * Set up for F0 test.
  * Lower IM crossbars in SR3 assembly frame.
  * Open curtain on SR3 crane slot.
  * Set up dummy load (weight carrier, rods etc).
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Week of 3/27:
 * f2f Meeting		 ==== Plan for week of 2/5 ====
 * Enzo on vacation; all others at Kamioka.
 * Build IRM around IM.
 * Cable/test/adjust IM OSEMs.
 * Time permitting, do TFs from IM OSEMs to themselves and to optical sensor.

==== Plan for week of 2/12 ====
 * Enzo on vacation; all others at Kamioka.

==== Vacation Info ====
 * Enzo 1/30-2/19 (at Mitaka 1/29, part of 1/30)
 * Kozu-kun 1/29-2/2

Scraps of text for incorporation in the VIS Meeting Minutes

KAGRA/Subgroups/VIS/MeetingNAOJ

Type B (Mark)

Report for week of 1/15

  • We swapped in the other available BF, and it was rather better: only 0.3 mm of keystone tilt rather than 1.3 mm. We will use it for the SR2 and then think about whether we want to use or rebuild the original one.
  • We finished the preparation of the second BF, setting the yoke, adding the new-style cable clamps etc.
  • We changed the 1.6 mm sockets on the BF LVDT cable to 1.0 mm ones to match the pins on the LVDT wires. The specification of the cable in D1503901 was apparently wrong. We will update it (today) before doing the cable order for the SR3 and SRM.
  • We updated the BS real-time model and screens, adding support for a damping filter common to both the OL-TM and OL-IM paths, per Izumi-san's suggestion in G1807653.
  • We set up the router for the SR2 rack and got the SR2_IM pico driver and both stepper motors on the network (the SR2_BF pico is still on order).
  • We did prep for the top filter test:
    • We received, unpacked and temporarily stored a shipment of weights and other parts.
    • We removed the top crossbars from the SR3 assembly frame.

Plan for week of 1/29

  • Enzo at Mitaka 1/29 and most of 1/30, then vacation.
  • Kozu-kun away.
  • All others at Kamioka.
  • Make in-air pico adapter cables.
  • Test IM picos and BF yaw pico.
  • Test FR.
  • Calibrate LVDT.
  • Get screws for ballast mass from Takahashi-san.
  • Install ballast mass in BF.
  • Set up for F0 test.
    • Lower IM crossbars in SR3 assembly frame.
    • Open curtain on SR3 crane slot.
    • Set up dummy load (weight carrier, rods etc).

Plan for week of 2/5

  • Enzo on vacation; all others at Kamioka.
  • Build IRM around IM.
  • Cable/test/adjust IM OSEMs.
  • Time permitting, do TFs from IM OSEMs to themselves and to optical sensor.

Plan for week of 2/12

  • Enzo on vacation; all others at Kamioka.

Vacation Info

  • Enzo 1/30-2/19 (at Mitaka 1/29, part of 1/30)
  • Kozu-kun 1/29-2/2

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