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| * Hirata-san: * Received many parts from i-ject for BFRM (took pictures and took them into ATC cleanroom). * got quotes for PRM/SRM payload from i-ject. * Checked quotes and asked for some modifications.) * Washed parts (parts for type-A, small hexagons, screws, etc\) * Wiped 9 piano wires and sent to Kamioka for PR. * pdated Fabian's EQstop parts for BS recoilmass and updated EQstop assy drawings. * Fabian * Worked out geometry for blade adjustment. * Designed additional ballast masses for BS BF (and SR). * Mark and Enzo (at Kamioka) * Did two rounds of adjustment of the blades with help from Takahashi-san (one for position, one for frequency) * Surveyed the position of the rod using the vertical mode of the bubble level. * Got apparent improvement as judged at the IRM-IM EQ stops (but still not perfect). * Did one more round of blade adjustments (without Takahashi-san) * Got good agreement with IRM-IM EQ stops, so put BF cap on and raised the whole system to check for balance. * Found balance still fairly bad: about the same on the -X,+Y diagonal and about half on the +X,+Y diagonal (70 and 30 mm worth of motion of a single trim mass respectively; previous a bit over 70 mm each). * From the imbalance torques, calculated the offset of rod as 2.3 mm in the direction 22 degrees to the +X side of -Y. * Calculated the blade adjustments required: {-0.325194, -1.79175, 2.11695} mm * Prepared to apply adjustments (removed cap etc). |
=== Type B (Mark) === ==== Past week report ==== At Kamioka (Mark, Ohishi-san, Fabian, Enzo, Hirata-san, Yoshioka-kun): * We moved all the in-air cables over to the tank. * We plugged all the in-air and in-vacuum cables into the feedthroughs and checked that we got signals from all the output channels (actuation not yet tested). We had to work around a snag with the new F-F gender changers that replace many Type 1 and Type 2 cables: like the vacuum feedthroughs, they flip pins 1 and 5. The in-air cables don't plug directly into the feedthroughs very well, so we made up some non-flipping adapters similar to the anti-feedthrough adapters. * Hirata-san fixed a problem with one of the rods supporting the LBB Cu ring, where the head was not seating in the receptacle at the bottom. The head was slightly bent so he just reinstalled the rod upside-down to move the bent head to a less critical spot. (This also establishes that it's possible to install the rods later if we need to, although it's more convenient to bring them in with the suspension on the crane as we've been doing it.) * We suspended the LBB. Per a request from Akutsu-san, we set it as high as we easily could. We decided on 30 mm higher than in the CAD, for a height of 367 (instead of 397) mm for the beam line above the LBB. * We moved a lot of stuff out of the +X side of the cleanbooth to behind SRM, so that Mirapro could connect the section of beam duct between the BS tank and the X arm. They put the new section in position but have not connected it up yet. * Hirata-san worked with Mirapro to get the SR assembly frame assembled in the SR3 area. (Insertion of the LBB and installation of the top of the tank is planned for 10/18-20.) * We investigated a problem with the IM OSEM readings, which were far from mid-range. Although Fabian and Ohishi-san got the payload hanging nicely on Thu 9/21, sometime between then and when we plugged the OSEMs back in on 9/28, the BF and IRM apparently tipped considerably (with the +X corner high) so that the H2 and H3 OSEM flags are fouling on the bottom and top of their respective OSEMs. * [To be continued. Do our intrepid investigators fix the problem without having to crane the suspension out of the tank again? Stay tuned for the next exciting installment!] ==== Plan for week of 10/2 ==== Kamioka: Mark, Enzo (Tue-Fri), Fabian, Ohishi-san. * Finish preparation for SR2 work. * '''Fix BF/IRM tilt issue!!!''' * Debug electronics, especially actuation. * Tune IP, do LVDT/stepper calibration. * Remove First Contact, try OL. ==== Plan for week of 10/10 ==== Holiday Mon 10/9, Open Day prep Fri 10/13.<<BR>> * Final preparation for alignment in week of 10/16. ==== Plan for week of 10/16 ==== * Work with alignment team. ==== Vacation Info ==== Mark: 10/16-24 |
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 all the in-air cables over to the tank.
- We plugged all the in-air and in-vacuum cables into the feedthroughs and checked that we got signals from all the output channels (actuation not yet tested). We had to work around a snag with the new F-F gender changers that replace many Type 1 and Type 2 cables: like the vacuum feedthroughs, they flip pins 1 and 5. The in-air cables don't plug directly into the feedthroughs very well, so we made up some non-flipping adapters similar to the anti-feedthrough adapters.
- Hirata-san fixed a problem with one of the rods supporting the LBB Cu ring, where the head was not seating in the receptacle at the bottom. The head was slightly bent so he just reinstalled the rod upside-down to move the bent head to a less critical spot. (This also establishes that it's possible to install the rods later if we need to, although it's more convenient to bring them in with the suspension on the crane as we've been doing it.)
- We suspended the LBB. Per a request from Akutsu-san, we set it as high as we easily could. We decided on 30 mm higher than in the CAD, for a height of 367 (instead of 397) mm for the beam line above the LBB.
- We moved a lot of stuff out of the +X side of the cleanbooth to behind SRM, so that Mirapro could connect the section of beam duct between the BS tank and the X arm. They put the new section in position but have not connected it up yet.
- Hirata-san worked with Mirapro to get the SR assembly frame assembled in the SR3 area. (Insertion of the LBB and installation of the top of the tank is planned for 10/18-20.)
- We investigated a problem with the IM OSEM readings, which were far from mid-range. Although Fabian and Ohishi-san got the payload hanging nicely on Thu 9/21, sometime between then and when we plugged the OSEMs back in on 9/28, the BF and IRM apparently tipped considerably (with the +X corner high) so that the H2 and H3 OSEM flags are fouling on the bottom and top of their respective OSEMs.
- [To be continued. Do our intrepid investigators fix the problem without having to crane the suspension out of the tank again? Stay tuned for the next exciting installment!]
Plan for week of 10/2
Kamioka: Mark, Enzo (Tue-Fri), Fabian, Ohishi-san.
- Finish preparation for SR2 work.
Fix BF/IRM tilt issue!!!
- Debug electronics, especially actuation.
- Tune IP, do LVDT/stepper calibration.
- Remove First Contact, try OL.
Plan for week of 10/10
Holiday Mon 10/9, Open Day prep Fri 10/13.
- Final preparation for alignment in week of 10/16.
Plan for week of 10/16
- Work with alignment team.
Vacation Info
Mark: 10/16-24