Differences between revisions 314 and 319 (spanning 5 versions)
Revision 314 as of 2018-08-29 15:15:51
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Editor: MarkBarton
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Revision 319 as of 2018-09-01 12:13:35
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Editor: MarkBarton
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Deletions are marked like this. Additions are marked like this.
Line 7: Line 7:
 * 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.
 * KAGRA was closed Mon/Tue 8/13-14 due to Obon.
 * Enzo and team investigated an issue with the 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.
Line 15: Line 15:
 * 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.
 * We configured a 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 to nominal height the jacks below the mushroom that will support the suspension.
Line 20: Line 20:
 * We checked the prism gluing and all the jigs came away successfully.  * We checked the prism gluing - all the jigs came away successfully.
Line 26: Line 26:
===== Arc weights =====
 * We did an inventory of arc weights to see if we had enough for SRM. Including the weights on the pallet, some weights left over from the BS, and the weights already on SR3, we have enough for a basic allocation for all of type B (172 kg for BS and 103.2 kg per SR) but with only 5 kg spare for tuning.
 * We brought all the arc weights into the cleanrooms and divided them up for the SRs.
 * Hirata-san cleaned up 1 large arc weight and 3 mediums left over from the BS that got wet during the heavy rain.
Line 27: Line 32:
 * 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.
Line 29: Line 33:
 * 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).  * After the IP study, we left three pairs of 10 mm arc weights installed on the IP and measured the frequencies with the digital system (instead of a stopwatch). Both L and T were around 0.08 Hz, which is good.
 * We unclamped the LBB damper rings, installed the rods down to the LBB and hooked the LBB. Mirapro then moved the SR2-SR3 duct to give more space at the SR2 end.
Line 32: Line 37:
 * 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.
 * We finished routing the in-vacuum cables, and started connecting everything through to the rack for final testing.
Line 36: Line 40:
 * 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.)
 * Panwei calibrated 6 OSEMs to be used on the IM. Two OSEMs have a long-term drift issue and may need repair. He took some long time series to characterize the drift.
Line 39: Line 42:
 * 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.''
 * 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) and the reflection is weak but better so we were able to use the HR side instead.
Line 43: Line 45:
 * Mark, Enzo, Hirata-san, Fabian, Kozu-kun, Panwei at Kamioka Mon-Fri.
 * (Mark possible trip to LIGO Hanford - TBD.)
===== SR2 =====
 * Mark, Fabian, Kozu-kun, Panwei at Kamioka Mon-Fri.
 * Enzo at Kamioka Mon-Thu.
 * Hirata-san at Kamioka Tue-Fri.
 * Major crane inspection Mon/Wed mornings using space where Type B work table is. SR2 craning will have to fit in around it.
 
===== SR2 (highest priority) =====
 * Connect cables through to rack.
 * Check/tweak alignment of chain.
 * Add arc weights (103 kg) and geophones - check IP.
 * Go/no-go test of electronics.
Line 47: Line 56:
 * Move SR2 in-air cables.
 * Remove First Contact
 * Unlock and realign payload.
Line 51: Line 57:
===== SRM =====
 *
===== SRM (lower priority) =====
 * Set pitch of SRM and RM, tighten clamps, remove winch system.
Line 54: Line 60:
 * Inspect all crane slots (SR, BS, PR) and check for missing bars and curtains.
Line 58: Line 65:
 * 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 68:
===== Etc =====
Line 61: Line 70:
===== SRM (highest priority) =====
 * Weigh IM/... section.
 * Build up SS to BF level.
 * Add BF.
 * Suspend IM and tweak height/balance.
 
Line 65: Line 79:
 * Mark, Hirata-san, Fabian, Kozu-kun, Panwei at Kamioka Tue-Fri.  * Mark, Hirata-san, Fabian, Panwei at Kamioka Tue-Fri.
===== SRM (highest priority) =====
 * Cable/test BF.
 * Install IRM.
 * Install/cable/test IM OSEMs.
===== SR2 (lower priority) =====
 * Move SR2 in-air cables.
 * Remove First Contact.
 * Unlock and realign suspension.
Line 69: Line 91:
 * Mark, Hirata-san, Fabian, Kozu-kun, Panwei at Kamioka Tue-Fri.

===== SR3 =====
 * Hook LBB, add ballast mass.
 * Tune IP.

===== SR2 =====
 * Adjust ballast/trim mass, with reserve for yaw stepper.
 * Cable/test PI items (LVDTs, steppers, geophones).
 * Set damper height.
 * Add arc weights, adjust IP.
 * Stage LBB damper rings in tank.
 
===== SRM =====
 * Check gluing result - redo if necessary.
 * Assemble RM.
 * Add IM ballast masses (we forgot this before).
 * Get parts from AOL and set up new pitch-setting OL.
 * Hang metal mass.
 * Hang RM.
 * Mark, Hirata-san, Fabian, Panwei at Kamioka Tue-Fri.
Line 96: Line 99:
 * 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 8/13

  • KAGRA was closed Mon/Tue 8/13-14 due to Obon.
  • Enzo and team investigated an issue with the 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 a 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 to nominal height the jacks below the mushroom that will support the suspension.

SRM
  • We reserved and configured two pico drivers.
  • We checked the prism gluing - 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

Arc weights
  • We did an inventory of arc weights to see if we had enough for SRM. Including the weights on the pallet, some weights left over from the BS, and the weights already on SR3, we have enough for a basic allocation for all of type B (172 kg for BS and 103.2 kg per SR) but with only 5 kg spare for tuning.
  • We brought all the arc weights into the cleanrooms and divided them up for the SRs.
  • Hirata-san cleaned up 1 large arc weight and 3 mediums left over from the BS that got wet during the heavy rain.

SR3
  • 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 and measured the frequencies with the digital system (instead of a stopwatch). Both L and T were around 0.08 Hz, which is good.
  • We unclamped the LBB damper rings, installed the rods down to the LBB and hooked the LBB. Mirapro then moved the SR2-SR3 duct to give more space at the SR2 end.

SR2
  • We finished routing the in-vacuum cables, and started connecting everything through to the rack for final testing.

SRM
  • Panwei calibrated 6 OSEMs to be used on the IM. Two OSEMs have a long-term drift issue and may need repair. He took some long time series to characterize the drift.
  • 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) and the reflection is weak but better so we were able to use the HR side instead.

Plan for week of 9/3

  • Mark, Fabian, Kozu-kun, Panwei at Kamioka Mon-Fri.
  • Enzo at Kamioka Mon-Thu.
  • Hirata-san at Kamioka Tue-Fri.
  • Major crane inspection Mon/Wed mornings using space where Type B work table is. SR2 craning will have to fit in around it.

SR2 (highest priority)
  • Connect cables through to rack.
  • Check/tweak alignment of chain.
  • Add arc weights (103 kg) and geophones - check IP.
  • Go/no-go test of electronics.
  • Crane in SR2.

SRM (lower priority)
  • Set pitch of SRM and RM, tighten clamps, remove winch system.

Etc
  • Inspect all crane slots (SR, BS, PR) and check for missing bars and curtains.
  • Prepare for scheduled power outage on 9/10.

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.

SRM (highest priority)
  • Weigh IM/... section.
  • Build up SS to BF level.
  • Add BF.
  • Suspend IM and tweak height/balance.

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.

SRM (highest priority)
  • Cable/test BF.
  • Install IRM.
  • Install/cable/test IM OSEMs.

SR2 (lower priority)
  • Move SR2 in-air cables.
  • Remove First Contact.
  • Unlock and realign suspension.

Plan for week of 9/24

  • Monday 9/24 is holiday (Autumn Equinox).
  • Mark, Hirata-san, Fabian, Panwei at Kamioka Tue-Fri.

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 2022-09-02 09:11:42 by fabian.arellano)