|
Size: 2843
Comment:
|
Size: 1963
Comment:
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 7: | Line 7: |
| 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 new 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). |
At Kamioka (Mark, Ohishi-san, Fabian, Enzo, Hirata-san, Yoshioka-kun, Kozu-kun): * We put lock nuts on the F0 FR and calibrated the F0 LVDT against FR position and keystone height. * Enzo traced the issue with the geophones to a specific cable. * We measured the BF and F0 GAS resonant frequencies. * We adjusted the spacing of the SR damper. * We double-checked the BS pitch with the OL. * We debugged the PI yaw mechanism. We managed to get the return spring properly adjusted, but the stepper motor tends to jam because of the strange design. * '''We prepared the suspension for lifting and craned it into the tank.''' * Hirata-san fixed an issue with one of the nailheads on the LBB intermediate ring support rods not properly seating, by removing the rod and reinstalling it upside down (with the problem nailhead in a less critical position). * Enzo and team moved all the in-air cables from the assembly frame to the tank. * Fabian and Ohishi-san unlocked the bottom section of the suspension and got it hanging freely. ==== Plan for week of 9/25 ==== Mark, Fabian, Enzo (Mon, Tue), Ohishi-san (Tue, Fri), Hirata-san, Yoshioka-kun (Tue, Wed, Fri), Kozu-kun * Finish moving in-air cabling and feedthroughs and reconnect in-vacuum cables (through Cu O-rings). * Unlock rest of suspension and readjust. * Debug electronics. * Unclamp LBB ring "sandwich" so LBB Cu ring is suspended on upper rods. * Install LBB lower rods and hook LBB. * Adjust LBB damper Cu-magnet gap. * Measure required ballast for LBB. * Remove First Contact, try OL. * Prepare for SR2 work. |
| Line 22: | Line 31: |
| ==== Plan for week of 10/2 ==== Kamioka: Mark, Enzo, Fabian, Ohishi-san. * TFs etc. Mitaka: Hirata-san? * SF design/purchasing. |
|
| Line 23: | Line 37: |
| ==== Plan for week of 7/31 ==== Kamioka: Mark (Mon-Fri), Fabian (Mon-Wed), Hirata-san (Tue-Thu), Yoshioka-kun (Tue, Wed, Fri) <<BR>> Mitaka: Hirata-san (Mon, Fri)<<BR>> Enzo: vacation * Recheck alignment of assembly frame and centering of optical table. * Install IM, suspend BS and RM. * Remove LBB rings (time permitting). ==== Plan for week of 8/7 ==== Site closure: Friday<<BR>> Kamioka: Mark (Mon-Thu), Enzo (Tue-Thu), Yoshioka-kun (Tue, Wed), Ohishi (TBD). Mitaka: Hirata-san (Mon-Fri) Vacation: Enzo (Mon), Fabian (Thu, Fri) * Weigh/trim BS/RM/IM. * Take out old BF; bring in rebuilt BF. * Suspend BS/RM/IM, add IRM. * Lay new in-air OSEM cables. Vacation Info: Enzo: Sat 7/22 through Sun 8/6 Fabian: Fri 8/4 through Mon 8/21 Mark: TBD Mid-Oct |
==== Vacation Info ==== Mark: 10/16-24 Enzo: 9/27-29 |
Scraps of text for incorporation in the VIS Meeting Minutes
KAGRA/Subgroups/VIS/MeetingNAOJ
Type B (Mark)
Past week report
At Kamioka (Mark, Ohishi-san, Fabian, Enzo, Hirata-san, Yoshioka-kun, Kozu-kun):
- We put lock nuts on the F0 FR and calibrated the F0 LVDT against FR position and keystone height.
- Enzo traced the issue with the geophones to a specific cable.
- We measured the BF and F0 GAS resonant frequencies.
- We adjusted the spacing of the SR damper.
- We double-checked the BS pitch with the OL.
- We debugged the PI yaw mechanism. We managed to get the return spring properly adjusted, but the stepper motor tends to jam because of the strange design.
We prepared the suspension for lifting and craned it into the tank.
- Hirata-san fixed an issue with one of the nailheads on the LBB intermediate ring support rods not properly seating, by removing the rod and reinstalling it upside down (with the problem nailhead in a less critical position).
- Enzo and team moved all the in-air cables from the assembly frame to the tank.
- Fabian and Ohishi-san unlocked the bottom section of the suspension and got it hanging freely.
Plan for week of 9/25
Mark, Fabian, Enzo (Mon, Tue), Ohishi-san (Tue, Fri), Hirata-san, Yoshioka-kun (Tue, Wed, Fri), Kozu-kun
- Finish moving in-air cabling and feedthroughs and reconnect in-vacuum cables (through Cu O-rings).
- Unlock rest of suspension and readjust.
- Debug electronics.
- Unclamp LBB ring "sandwich" so LBB Cu ring is suspended on upper rods.
- Install LBB lower rods and hook LBB.
- Adjust LBB damper Cu-magnet gap.
- Measure required ballast for LBB.
- Remove First Contact, try OL.
- Prepare for SR2 work.
Plan for week of 10/2
Kamioka: Mark, Enzo, Fabian, Ohishi-san.
- TFs etc.
Mitaka: Hirata-san?
- SF design/purchasing.
Vacation Info
Mark: 10/16-24 Enzo: 9/27-29