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| At Kamioka (Mark, Fabian, Enzo, Hirata-san): | At Kamioka (Mark, Ohishi-san, Fabian, Enzo, Hirata-san, Kozu-kun): * We couldn't account for a bubble level, so we removed a service port cover, searched again on top of the BF and found it. * We put the table KOACH filters on the table. Ohishi-san then removed the FC in two stages (AR side on Tue, HR side on Fri). * Ohishi-san measured the height of the SS and optic relative to the tank and found the optic was 3 mm low but the SS was 2 mm high. According to the GAS LVDTs, the suspension had not sagged but was 1.7 mm high. * Therefore we raised the suspension by 9 quarter-turns of the tank jacks (4.5 mm) so that the optic would be in the right position after (future) downward adjustment of the GAS filters. * We put the GAS LVDT calibration data as offsets and gains in the LVDTINF filters so the output would be height in µm relative to nominal. * We calibrated the IP LVDTs. We had worked around a mechanical interference due to the poor design of the old LVDTs by setting them to be 4 mm off-center with the IP locked centrally, but we discovered this was overkill and we have lost some linear range on the LVDT sensor in the opposite direction. If we have time we may move the LVDT bases 1-2 mm to a compromise position. * We worked with Simon to get the OL aligned and to learn the adjustment procedure. * Mark updated Sekiguchi-san's SUMCON to allow for comments to be entered next to all values (75% finished). * Kozu-kun worked on deriving the diagonalization matrices for the IP FRs. At Mitaka (Hirata-san): * Hirata-san met with manufacturers and requested quotes. * Hirata-san made many assembly drawings for sections of the SR. * Hirata-san worked on compiling the SR inventory. |
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| * Enzo and Fabian routed all the SF/... cabling up past the SF and anchored it to the PI. * Enzo and Fabian moved the vacuum feedthroughs to new positions on the assembly frame corresponding more closely to the positions on the tank. * Hirata-san received the LBB blades back from additional machining, and he and Mark characterized them, and chose the 3 that were most closely matched. The total load capacity is 294 kg, which is rather larger than the 202 kg for the LBB and intermediate ring. * Mark measured all the coil resistances for the LVDTs and steppers on the PI to check everything was wired properly. * Hirata-san received the outrigger plates for the LBB black from additional machining to add helicoils but discovered that they were not M16 fine pitch but M16 regular. He sent them off again to be corrected. * Mark and Hirata-san inspected the vacuum tank and discovered that the top section is on backwards relative to the 3D CAD so that the jacks supporting the tank and the jacks supporting the PI via bellows are interchanged. We decided that, for the test hang, we would put the suspension in with a 135° anticlockwise rotation (instead of a 45° clockwise one). For the final hang, we will build the suspension with the BS/RM section backwards. * Fabian moved the F0 trim mass from on top of the F0 keystone and anchored it to the SF, keeping about 0.5 kg in reserve to allow for the weight of the SF-PI cables. * Enzo, Fabian and Hirata-san rearranged the in-air cabling for the OSEMs to match changes to the in-vacuum cables. |
==== Plan for week of 10/16 ==== Kamioka: all but Mark * Remove sticker residue and permanent marker writing on PI. * Fix broken and unreliable connections on IP LVDTs. * Wipe any rust from around IP LVDTs. * (If Enzo thinks it necessary and there's time) adjust IP LVDT mechanical offsets to maximize usable range and recalibrate. * Add IP LVDT gains and offsets to IP_LVDTINF filter blocks. * Calibrate IP LVDT actuation against IP LVDT sensing. * Install damping filters for IP LVDTs. * Adjust gains and debug damping for IM OSEMs and GAS LVDTs. * Modify IP LVDT damping filters to include set point. * Install and debug IP LVDT and geophone diagonalization matrices. * (Time permitting) Try adding mass to IP. * Work with alignment team. * Work with Mirapro on SR LBB and tank installation (Hirata-san, from Wed) * Work with Miyo-kun to get user interface for stepper motors. * Calibrate IP FR actuation against IP LVDT sensing. * SR procurement. |
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| ==== Plan for coming weeks ==== For more detail, see [[KAGRA/Subgroups/VIS/TypeB/ToDo]]. Week of 6/6: * Cabling: * Finish moving in-air cabling to match feedthrough positions. * Cable and test PI vertical LVDT. * Calibrate PI vertical LVDT. * Set yoke on PI vertical LVDT (if necessary). * Cable and test PI yaw stepper. * Cable and test PI vertical stepper. * Cable and test PI horizontal steppers. * Cable and test PI horizontal LVDTs. * Calibrate PI horizontal LVDTs. Week of 6/12: * Remove -Y flange cover. * Wipe LBB. * Loosen or remove LBB hold-down bolts. * Attach LBB outriggers and rod receptacles. * Remove port covers where feedthroughs will go. * Crane into tank. |
==== 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, Kozu-kun):
- We couldn't account for a bubble level, so we removed a service port cover, searched again on top of the BF and found it.
- We put the table KOACH filters on the table. Ohishi-san then removed the FC in two stages (AR side on Tue, HR side on Fri).
- Ohishi-san measured the height of the SS and optic relative to the tank and found the optic was 3 mm low but the SS was 2 mm high. According to the GAS LVDTs, the suspension had not sagged but was 1.7 mm high.
- Therefore we raised the suspension by 9 quarter-turns of the tank jacks (4.5 mm) so that the optic would be in the right position after (future) downward adjustment of the GAS filters.
- We put the GAS LVDT calibration data as offsets and gains in the LVDTINF filters so the output would be height in µm relative to nominal.
- We calibrated the IP LVDTs. We had worked around a mechanical interference due to the poor design of the old LVDTs by setting them to be 4 mm off-center with the IP locked centrally, but we discovered this was overkill and we have lost some linear range on the LVDT sensor in the opposite direction. If we have time we may move the LVDT bases 1-2 mm to a compromise position.
- We worked with Simon to get the OL aligned and to learn the adjustment procedure.
- Mark updated Sekiguchi-san's SUMCON to allow for comments to be entered next to all values (75% finished).
- Kozu-kun worked on deriving the diagonalization matrices for the IP FRs.
At Mitaka (Hirata-san):
- Hirata-san met with manufacturers and requested quotes.
- Hirata-san made many assembly drawings for sections of the SR.
- Hirata-san worked on compiling the SR inventory.
Plan for week of 10/16
Kamioka: all but Mark
- Remove sticker residue and permanent marker writing on PI.
- Fix broken and unreliable connections on IP LVDTs.
- Wipe any rust from around IP LVDTs.
- (If Enzo thinks it necessary and there's time) adjust IP LVDT mechanical offsets to maximize usable range and recalibrate.
- Add IP LVDT gains and offsets to IP_LVDTINF filter blocks.
- Calibrate IP LVDT actuation against IP LVDT sensing.
- Install damping filters for IP LVDTs.
- Adjust gains and debug damping for IM OSEMs and GAS LVDTs.
- Modify IP LVDT damping filters to include set point.
- Install and debug IP LVDT and geophone diagonalization matrices.
- (Time permitting) Try adding mass to IP.
- Work with alignment team.
- Work with Mirapro on SR LBB and tank installation (Hirata-san, from Wed)
- Work with Miyo-kun to get user interface for stepper motors.
- Calibrate IP FR actuation against IP LVDT sensing.
- SR procurement.
Vacation Info
Mark: 10/16-24