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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, Enzo, Simon, Type Bp team): * Mark remade the BF pico adapter cable which was poorly made and had also been damaged. * The Type Bp team tided up the BS rack and made new labels for many cables (thanks!). * Enzo connected up the in-air cables for the picos and steppers. * Mark and Enzo renumbered the PI LVDTs, geophones and LVDTs to make a consistent scheme working anticlockwise. * Enzo and Mark debugged all the cables. The only problem we couldn't solve was that the actuator coil for PI LVDT #0 is open-circuit at the connector on the LVDT. (It has been intermittent but worked before the craning.) We may have to redo the connector or replace the LVDT. Limited TFs will be possible in the next week. * Simon set up the LSOL and was easily able to get a return beam from the mirror on the dummy BS. * Shoda-san copied over the LSOL section of the PR3 real-time model into the BS model and made other improvements (thanks!). * Mark brought home |
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| * 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. |
At Mitaka (Fabian, Hirata-san): * Fabian finished designing final trim masses for IM/BF/SF for the final hang of the BS and passed it to Hirata-san to make drawings and get quotes. * Hirata-san requested quotes for the replaceable-jaw version of the BS wire clamps. * Fabian and Hirata-san gathered needed items for the BS prism/flag gluing. * Hirata-san designed receptacles for the new rods with 8 mm heads and requested quotes. |
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| ==== Plan for coming weeks ==== For more detail, see [[KAGRA/Subgroups/VIS/TypeB/ToDo]]. |
==== Plan for week of 7/3 ==== * Do prism/flag gluing on real BS at Kashiwa (whole team). * Do new 3D CAD (Hirata-san): * SR2 on BS assembly frame. (Adjust jack positions if possible, or leave for Fabian/Mark to do.) * Final BS build, SS/PI/SF as for Test Hang but with BF/IRM/IM/BS/RM down rotated back to original direction. * On-assembly-frame version. (Adjust jack positions if possible, or leave for Mark to do.) * In-tank version. * Solve arc weight versus magic wand problem. * Do mass budget for LBB - design ballast masses (Fabian) * Run TFs, make improvements to real-time model (Mark, Enzo). |
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| Week of 5/22: * Reinstall PI, this time with rods and damper ring. * Reinstall PI-SF rod, this time with hex cable clamp. * Prepare for PR2 bellows removal on 5/15 (move table with tools). * Cable/test PI horizontal LVDTs and steppers. * Install/cable/test geophones. |
==== Plan for week of 7/10 ==== Mark and Enzo at Kamioka: * Fix broken LVDT actuator coil. * Learn how Miyo-kun's pico driver software works and make improvements. * Test picos and steppers more fully. * Finish tidying rack and labeling cables. Fabian and Hirata-san at Mitaka. * Design SR assembly frame. * Inventory for SR. |
Scraps of text for incorporation in the VIS Meeting Minutes
KAGRA/Subgroups/VIS/MeetingNAOJ
Type B (Mark)
Past week report
At Kamioka (Mark, Enzo, Simon, Type Bp team):
- Mark remade the BF pico adapter cable which was poorly made and had also been damaged.
- The Type Bp team tided up the BS rack and made new labels for many cables (thanks!).
- Enzo connected up the in-air cables for the picos and steppers.
- Mark and Enzo renumbered the PI LVDTs, geophones and LVDTs to make a consistent scheme working anticlockwise.
- Enzo and Mark debugged all the cables. The only problem we couldn't solve was that the actuator coil for PI LVDT #0 is open-circuit at the connector on the LVDT. (It has been intermittent but worked before the craning.) We may have to redo the connector or replace the LVDT. Limited TFs will be possible in the next week.
- Simon set up the LSOL and was easily able to get a return beam from the mirror on the dummy BS.
- Shoda-san copied over the LSOL section of the PR3 real-time model into the BS model and made other improvements (thanks!).
- Mark brought home
At Mitaka (Fabian, Hirata-san):
- Fabian finished designing final trim masses for IM/BF/SF for the final hang of the BS and passed it to Hirata-san to make drawings and get quotes.
- Hirata-san requested quotes for the replaceable-jaw version of the BS wire clamps.
- Fabian and Hirata-san gathered needed items for the BS prism/flag gluing.
- Hirata-san designed receptacles for the new rods with 8 mm heads and requested quotes.
Plan for week of 7/3
- Do prism/flag gluing on real BS at Kashiwa (whole team).
- Do new 3D CAD (Hirata-san):
- SR2 on BS assembly frame. (Adjust jack positions if possible, or leave for Fabian/Mark to do.)
- Final BS build, SS/PI/SF as for Test Hang but with BF/IRM/IM/BS/RM down rotated back to original direction.
- On-assembly-frame version. (Adjust jack positions if possible, or leave for Mark to do.)
- In-tank version.
- Solve arc weight versus magic wand problem.
- Do mass budget for LBB - design ballast masses (Fabian)
- Run TFs, make improvements to real-time model (Mark, Enzo).
Plan for week of 7/10
Mark and Enzo at Kamioka:
- Fix broken LVDT actuator coil.
- Learn how Miyo-kun's pico driver software works and make improvements.
- Test picos and steppers more fully.
- Finish tidying rack and labeling cables.
Fabian and Hirata-san at Mitaka.
- Design SR assembly frame.
- Inventory for SR.