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← Revision 200 as of 2017-10-13 14:57:07 → ⇥
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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, 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.
Line 9: Line 23:
 * 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.		 ==== 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 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.
 		 ==== 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

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