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==== Report for week of 8/13 ====
 * KAGRA was closed Mon/Tue 8/13-14 due to O-Bon.
 * Enzo and team debugged an issue with height of the SR3 keystone coupling to yaw of the payload as measured by the OL. We suspect a ferromagnetic item on the SF damper, but we're not sure.

==== Report for week of 8/20 ====
===== SR3 =====
 * Hatoya-san and Enzo gathered date for a study of yaw mode Q damping time as a study of damper ring height.
===== SR2 =====
 * We continued with cabling work.
 * We configured the second pico driver and connected it.
 * We assembled the LBB damper rings in the tank, craned them to near the top and hooked them. While the tank was open we also set the jacks below the mushroom that will support the suspension to nominal height.

===== SRM =====
 * We reserved and configured two pico drivers.
 * We checked the prism gluing and all the jigs came away successfully.
 * Fabian assembled the RM.
 * Hirata-san added ballast masses to the IM and we weighed it, as well as the RM and the optic in the mirror box.
 * We suspended the optic and RM.

==== Report for week of 8/27 ====
===== SR3 =====
 * We did an inventory of arc weights to see if we had enough for SRM and found that we had only enough for a basic allocation for all of type B (172 kg for BS and 103.2 kg per SR) with almost no spare for tuning.
 * Using SR3, we did a quick study of the IP frequency as a function of the number of arc weights, to see how much more we might need. 3 pairs of small arc weights (10 mm thick, 4.53 kg each) brought the frequency below 0.1 Hz, 4 pairs made it unstable. If SR3 is typical we would need about 27 kg extra per suspension.
 * After the IP study, we left three pairs of 10 mm arc weights installed on the IP for more investigation with the digital system (instead of a stopwatch).

===== SR2 =====
 * We finished routing the in-vacuum cables, and connected everything through to the rack for final testing.
 * We brought a basic 103.2 kg set of arc weights (3 large (38 mm) and 6 medium (19 mm)) into the SR2 cleanbooth.

===== SRM =====
 * Panwei calibrated 6 OSEMs to be used on the IM.
 * We brought in all the remaining arc weights from the pallet into the SRM cleanbooth, and Hirata-san cleaned up 1 large arc weight and 3 mediums left over from the BS that complete a basic set of 103.2 kg, plus about 5 kg spare. (However 27 kg of these are on loan to SR3.)
 * We assembled and installed the bottom section of the security structure under the optic and RM.
 * We set up a new OL for setting the pitch. We found the reflection off the AR surface was much weaker than for SR2 and SR3, but fortunately the HR surface is almost flat (ROC≈300 m) so we were able to use the HR reflection instead.
 * ''We set the pitch of the SRM and RM and tightened the wire clamps.''

==== Plan for week of 9/3 ====
 * Mark, Enzo, Hirata-san, Fabian, Kozu-kun, Panwei at Kamioka Mon-Fri.
 * (Mark possible trip to LIGO Hanford - TBD.)
===== SR2 =====
 * Crane in SR2.
 * Move SR2 in-air cables.
 * Remove First Contact
 * Unlock and realign payload.

===== SRM =====
 *
===== Etc =====
 * Prepare for scheduled power outage on 9/10.
==== Report for week of 9/3 ====
 * We did more in-vacuum and in-air cabling for SR2 and got nearly everything connected.
 * We debugged the IM OSEMs and fixed two broken in-vacuum cables and some mislabeled in-air cables.
 * We debugged an issue with the IP LVDTs and discovered it was a broken interface card D1402829 in the LVDT driver. We made up a working chassis with the original two driver cards, so we didn't have to reset all the phases and gains.
 * We reset the IP FRs to midrange.
 * We added a basic set of arc weights and recentered the IP. We then adjusted the verticality of the security structure.
 * We relocked the IP temporarily, unlocked the SF/... section and aligned the IM OSEMs.
 * We powered down the BS, SR3 and SR2 electronics in preparation for the power outage.
Line 58: Line 17:
 * Mark, Hirata-san, Fabian, Kozu-kun, Panwei at Kamioka Tue-Fri.  * Mark in US (job interview).
 *
Hirata-san, Fabian, Kozu-kun, Panwei at Kamioka Tue-Fri.
Line 60: Line 20:
===== Etc =====
Line 61: Line 22:
===== SR2 =====
 * Calibrate F0 LVDTs.
 * Calibrate IP LVDTs.
 * Cable geophones and any other remaining PI items.
 * Finish in-air cabling (sort out and relabel rack and feedthrough ends of any repurposed cables).
 * Do basic go/no-go test of electronic items.
 * Check SF keystone height and offload with FR as necessary.
 * Adjust ballast/trim mass of SF, with reserve for yaw stepper.
 * Set SF damper magnet ring height.
 * Check/tweak optic pitch.
 * TFs.
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 * Mark, Hirata-san, Fabian, Kozu-kun, Panwei at Kamioka Tue-Fri.  * Mark, Hirata-san, Fabian, Panwei at Kamioka Tue-Fri.
===== SR2 =====
 * Crane SR2 into tank.
 * Move SR2 in-air cables.
 * Remove First Contact.
 * Unlock and realign suspension.
===== SRM =====
 * Set pitch of SRM and RM, tighten clamps, remove winch system.
 * Weigh IM/... section.
 * Build up SS to BF level.
 * Add BF.
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 * Mark, Hirata-san, Fabian, Kozu-kun, Panwei at Kamioka Tue-Fri.  * Mark, Hirata-san, Fabian, Panwei at Kamioka Tue-Fri.
 * Suspend IM and tweak height/balance.
===== SRM =====
 * Cable/test BF.
 * Install IRM.
 * Install/cable/test IM OSEMs.
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 * Mark: 8/13-16.
 * Hirata-san: 8/13-17
 * Terrence: 8/24-26 f2f, then returns to Hong Kong.
 * Mark: 9/10-14 (job interview in US).

Scraps of text for incorporation in the VIS Meeting Minutes

KAGRA/Subgroups/VIS/MeetingNAOJ

Type B (Mark)

Report for week of 9/3

  • We did more in-vacuum and in-air cabling for SR2 and got nearly everything connected.
  • We debugged the IM OSEMs and fixed two broken in-vacuum cables and some mislabeled in-air cables.
  • We debugged an issue with the IP LVDTs and discovered it was a broken interface card D1402829 in the LVDT driver. We made up a working chassis with the original two driver cards, so we didn't have to reset all the phases and gains.
  • We reset the IP FRs to midrange.
  • We added a basic set of arc weights and recentered the IP. We then adjusted the verticality of the security structure.
  • We relocked the IP temporarily, unlocked the SF/... section and aligned the IM OSEMs.
  • We powered down the BS, SR3 and SR2 electronics in preparation for the power outage.

Plan for week of 9/10

  • Monday 9/10 is scheduled power outage.
  • Mark in US (job interview).
  • Hirata-san, Fabian, Kozu-kun, Panwei at Kamioka Tue-Fri.
  • Enzo at Kamioka Tue-Thu, then JPS Meeting Fri, then vacation.

Etc
  • Recover from power outage.

SR2
  • Calibrate F0 LVDTs.
  • Calibrate IP LVDTs.
  • Cable geophones and any other remaining PI items.
  • Finish in-air cabling (sort out and relabel rack and feedthrough ends of any repurposed cables).
  • Do basic go/no-go test of electronic items.
  • Check SF keystone height and offload with FR as necessary.
  • Adjust ballast/trim mass of SF, with reserve for yaw stepper.
  • Set SF damper magnet ring height.
  • Check/tweak optic pitch.
  • TFs.

Plan for week of 9/17

  • Monday 9/17 is holiday (Respect for the Aged Day).
  • Enzo on vacation.
  • Mark, Hirata-san, Fabian, Panwei at Kamioka Tue-Fri.

SR2
  • Crane SR2 into tank.
  • Move SR2 in-air cables.
  • Remove First Contact.
  • Unlock and realign suspension.

SRM
  • Set pitch of SRM and RM, tighten clamps, remove winch system.
  • Weigh IM/... section.
  • Build up SS to BF level.
  • Add BF.

Plan for week of 9/24

  • Monday 9/24 is holiday (Autumn Equinox).
  • Mark, Hirata-san, Fabian, Panwei at Kamioka Tue-Fri.
  • Suspend IM and tweak height/balance.

SRM
  • Cable/test BF.
  • Install IRM.
  • Install/cable/test IM OSEMs.

To-Do Lists, Schedule

Vacation Info

  • Mark: 9/10-14 (job interview in US).
  • Enzo: 9/14 JPS, 9/15 through 10/8 vacation in Chile.

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