Differences between revisions 144 and 169 (spanning 25 versions)
⇤ ← Revision 144 as of 2017-05-18 18:35:14 →
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Editor: MarkBarton
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← Revision 169 as of 2017-07-28 13:55:30 → ⇥
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Editor: MarkBarton
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Deletions are marked like this. Additions are marked like this.
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At Kamioka (Mark, Fabian, Enzo, Perry, Hirata-san): At Kamioka (Mark, Enzo, Hirata-san, Yoshioka-kun):
 * We disassembled the suspension.
  * We removed all the cables and bagged and labelled them for reuse.
  * The PI is parked on the pallet.
  * The SF was initially parked between the frame and tank and then manhandled to one side. The same procedure was used for the SF ring.
  * The BF was parked between the assembly frame and tank. The BF ring was stored in the top of the structure.
  * We removed various useful and no-longer-needed items from the BF, including the lower rod receptacle, thrust bearing, fishing rod and temporary ballast masses.
  * We cut the wires and removed the RM and dummy BS on the RM trolley.
 * The wire clamps were moderately deeply scarred and could probably be reused, but we plan to use the new set, which will be available on Tuesday of next week.
 * We discovered that the problem with the old BF was due to the fishing rod, which had not had a pair of lock nuts and had been damaged by being drive too high, so that the springs hit the underside of the cap and were bent at the base. We will install lock nuts and set them to the correct height for the final installation.
 * The gluing of the BS primary prisms and magnets went well, but we had to reglue the secondary prisms because they stuck to the jigs and were pulled off when the jigs were retracted. The second try went well and the BS is ready for use.
 * Fabian and Hirata-san characterized 7 new BS BF blades. There was one outlier but the rest were in a tight group.
 * Hirata-san used 3 of the blades to build a new BF.
 * Miyo-kun and others from the Type Bp team did a lot of tidying up of the BS rack for us, and removed a lot of in-air cables running through the cleanbooth. When he returns, on 8/8, Enzo will coordinate relaying the cables in the cable trays (which were not installed when the initial cabling was done).
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 * We cleared space for the PR2 team to remove a bellows from their tank.
 * We installed safety bars on the pillars near the assembly frame at about waist height for someone on the tall ladder. We reinforced the clamps with cable ties.
 * We bridged a gap in the second floor on the -X side of the SF2 tank with spare floor panels.
 * We removed the PI from the assembly frame.
 * We encountered a problem with the PI-SF rod jamming in the SF. We finally got it out by clamping a pair of vice grips to the rod and hammering. We found that the receptacle part was the right size (7.0 mm) but had been deformed around the edge. Hirata-san used a knife and sandpaper to lean up the edge and then ultrasonically cleaned it.
 * We removed the LLB blade units from the PI, removed the blades from the clamps and sent the blades away for more rework to fix the length problem. Fortunately the tab section at the tip is fairly long, so we can just add a second hole further from the end.
 * We tested the SR fishing rod again, but it would only go up, not down. We found that reseting the driver fixed it, but we also moved the driver boxes into the cleanbooth to reduce the length of the motor cables. (Instead, we had to run some long DC and LAN cables.)
 * We adjusted the limit nut on the SF fishing rod to increase the range.
 * We debugged an issue with the SF keystone sitting lower than previously and found we had accidentally left two eyebolts on top of the BF. We retrimmed the BF/... section to reset the keystone to nominal (65.5 mm) with the fishing rod at mid-range.
 * We removed one segment of the Cu ring on the SF cap and reconfigured the other two to be symmetrical.
 * Fabian designed a layout for the SF damper ring magnets that would work with the modified Cu ring, and placed the magnets with the template. The poles of the magnets were not on the expected faces so we had to stand the magnets up, with the 12x12 faces sideways and the 10x12 mm pole faces up/down. We will need to raise the magnet ring by 2 mm to allow for the extra height.
 * Hirata-san made a cable for the PI v vertical LVDT. We identified the coils by their resistances which were similar to BF/SF: Primary 193Ω, Secondary 75Ω, Actuation 112Ω.
 * We added the remaining cable clamps to the PI (some places had not been accessible with the PI on the frame).
 * We placed the geophones but discovered we didn't have some mounting brackets called out in the 3D CAD.
 * Enzo made a PI yaw/vertical stepper adapter cable and a trial geophone descrambler cable (one of three).
 * We found that part of the problem with the SF LVDT was that the actuation had not been enabled for SF or F0 in the real-time model. We fixed the model and are now able to drive the LVDT actuator and see input at the LVDT sensor.
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==== Plan for coming weeks ====
For more detail, see [[KAGRA/Subgroups/VIS/TypeB/ToDo]].		 ==== Plan for week of 7/24 ====
Full team at Kamioka from Mon-Fri, except Hirata-san (Tue-Fri) and Enzo (vacation).
 * Check results of gluing.
 * Finish disassembly.
 * Finish BF rebuild.
 * Remove LBB rings.
 * Recheck alignment of assembly frame and centering of optical table.
 * Install IM, suspend BS and RM.
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Week of 5/22:
 * Reinstall PI, this time with rods and damper ring.
 * Reinstall PI-SF rod, this time with hex cable clamp.
 * Cable/test PI horizontal LVDTs and steppers.
 * Install/cable/test geophones.
 		 ==== Plan for week of 7/31 ====
Full team at Kamioka from Mon-Fri, except Fabian (Mon-Thu) and Enzo (vacation).
 * Weigh/trim BS/RM/IM.
 * Bring in rebuilt BF.

Vacation Info:
Hirata-san: Thu 7/20 through Mon 7/24
Enzo: Sat 7/22 through Sun 8/6
Fabian: Fri 8/4 through Mon 8/21
Mark: TBD Mid-Oct

Scraps of text for incorporation in the VIS Meeting Minutes

KAGRA/Subgroups/VIS/MeetingNAOJ

Type B (Mark)

Past week report

At Kamioka (Mark, Enzo, Hirata-san, Yoshioka-kun):

  • We disassembled the suspension.
    • We removed all the cables and bagged and labelled them for reuse.
    • The PI is parked on the pallet.
    • The SF was initially parked between the frame and tank and then manhandled to one side. The same procedure was used for the SF ring.
    • The BF was parked between the assembly frame and tank. The BF ring was stored in the top of the structure.
    • We removed various useful and no-longer-needed items from the BF, including the lower rod receptacle, thrust bearing, fishing rod and temporary ballast masses.
    • We cut the wires and removed the RM and dummy BS on the RM trolley.
  • The wire clamps were moderately deeply scarred and could probably be reused, but we plan to use the new set, which will be available on Tuesday of next week.
  • We discovered that the problem with the old BF was due to the fishing rod, which had not had a pair of lock nuts and had been damaged by being drive too high, so that the springs hit the underside of the cap and were bent at the base. We will install lock nuts and set them to the correct height for the final installation.
  • The gluing of the BS primary prisms and magnets went well, but we had to reglue the secondary prisms because they stuck to the jigs and were pulled off when the jigs were retracted. The second try went well and the BS is ready for use.
  • Fabian and Hirata-san characterized 7 new BS BF blades. There was one outlier but the rest were in a tight group.
  • Hirata-san used 3 of the blades to build a new BF.
  • Miyo-kun and others from the Type Bp team did a lot of tidying up of the BS rack for us, and removed a lot of in-air cables running through the cleanbooth. When he returns, on 8/8, Enzo will coordinate relaying the cables in the cable trays (which were not installed when the initial cabling was done).

Plan for week of 7/24

Full team at Kamioka from Mon-Fri, except Hirata-san (Tue-Fri) and Enzo (vacation).

  • Check results of gluing.
  • Finish disassembly.
  • Finish BF rebuild.
  • Remove LBB rings.
  • Recheck alignment of assembly frame and centering of optical table.
  • Install IM, suspend BS and RM.

Plan for week of 7/31

Full team at Kamioka from Mon-Fri, except Fabian (Mon-Thu) and Enzo (vacation).

  • Weigh/trim BS/RM/IM.
  • Bring in rebuilt BF.

Vacation Info: Hirata-san: Thu 7/20 through Mon 7/24 Enzo: Sat 7/22 through Sun 8/6 Fabian: Fri 8/4 through Mon 8/21 Mark: TBD Mid-Oct

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