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Size: 2477
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| Deletions are marked like this. | Additions are marked like this. |
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| 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. |
At Kamioka (Mark, Ohishi-san, Fabian, Enzo, Hirata-san, Yoshioka-kun): * We moved or covered stuff in the BS cleanbooth to prepare for the SR2 crane slot cutting and BS-> SR2 assembly frame move. * We put the service port covers back on at the BF level of the BS tank. * We used the PI jacks to center the bottom of the security structure around the RM. * We debugged a mechanical issue where the #2 IP LVDT had too narrow a gap between the moving and fixed parts, so that there was interference with only a very small clockwise yaw of the IP. We fixed it by moving the bottom baseplate (taking advantage of the fact that it was held by screws in oversize holes for this purpose). * We used the IP FRs to center the IP. * We set the gains on the IP LVDT driver. * We tested the picos and most of the steppers. The picos and IP steppers all work nicely. The PI FR and yaw steppers have jamming issues. We haven't tested the BF and SF FR steppers. * We debugged an issue with one of the geophones (#1) which has a DC offset. We did cable swaps and determined that the issue is internal to the geophone pod. A second geophone (#2) saturates at a suspiciously small voltage on the negative side. Again the issue is internal. * Fabian designed an improvement to the PI yaw stepper driver mount to stop the stepper jamming. * Fabian worked on a plan to measure the load capacity of the SR PIs. * Hirata-san did 2D drawings of the PI for the SR, and of SF2 and SRM in their vacuum chambers. * Hirata-san did drawings if the SR LBB damper rings and asked for quotes. * Hirata-san asked for quotes for SR secondary wire breakers and SR IM/IRM lock screws * Hirata-san ordered SR IM wire clamps. * Hirata-san worked on parts lists for SR cable clamps. |
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| Kamioka: Mark, Enzo, Fabian, Ohishi-san. * TFs etc. Mitaka: Hirata-san? * SF design/purchasing. |
* Design ballast for LBB. * Design improved PI yaw adjustment. * SR procurement. ==== Plan for week of 10/10 ==== Kamioka: Mark, Fabian, Enzo, Ohishi-san, Kozu-kun. Mitaka: Hirata-san Holiday Mon 10/9, Open Day prep Fri 10/13.<<BR>> * Tune IP, do LVDT/stepper calibration. * Remove First Contact, try OL. * TFs, final preparation for alignment in week of 10/16. ==== Plan for week of 10/16 ==== Kamioka: all but Mark * Work with alignment team. |
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| 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):
We moved or covered stuff in the BS cleanbooth to prepare for the SR2 crane slot cutting and BS-> SR2 assembly frame move.
- We put the service port covers back on at the BF level of the BS tank.
- We used the PI jacks to center the bottom of the security structure around the RM.
- We debugged a mechanical issue where the #2 IP LVDT had too narrow a gap between the moving and fixed parts, so that there was interference with only a very small clockwise yaw of the IP. We fixed it by moving the bottom baseplate (taking advantage of the fact that it was held by screws in oversize holes for this purpose).
- We used the IP FRs to center the IP.
- We set the gains on the IP LVDT driver.
- We tested the picos and most of the steppers. The picos and IP steppers all work nicely. The PI FR and yaw steppers have jamming issues. We haven't tested the BF and SF FR steppers.
- We debugged an issue with one of the geophones (#1) which has a DC offset. We did cable swaps and determined that the issue is internal to the geophone pod. A second geophone (#2) saturates at a suspiciously small voltage on the negative side. Again the issue is internal.
- Fabian designed an improvement to the PI yaw stepper driver mount to stop the stepper jamming.
- Fabian worked on a plan to measure the load capacity of the SR PIs.
- Hirata-san did 2D drawings of the PI for the SR, and of SF2 and SRM in their vacuum chambers.
- Hirata-san did drawings if the SR LBB damper rings and asked for quotes.
- Hirata-san asked for quotes for SR secondary wire breakers and SR IM/IRM lock screws
- Hirata-san ordered SR IM wire clamps.
- Hirata-san worked on parts lists for SR cable clamps.
Plan for week of 10/2
- Design ballast for LBB.
- Design improved PI yaw adjustment.
- SR procurement.
Plan for week of 10/10
Kamioka: Mark, Fabian, Enzo, Ohishi-san, Kozu-kun. Mitaka: Hirata-san Holiday Mon 10/9, Open Day prep Fri 10/13.
- Tune IP, do LVDT/stepper calibration.
- Remove First Contact, try OL.
- TFs, final preparation for alignment in week of 10/16.
Plan for week of 10/16
Kamioka: all but Mark
- Work with alignment team.
Vacation Info
Mark: 10/16-24