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| * Activity report for week of 12/12 * Mark, Fabian and Enzo continued BS Test Hang work: * We shipped BS mirror box parts to Shoda-san and components for a new LVDT cable to Hirata-san. * We posed for pictures of the BS by a team from National Geographic. * We installed the BF fishing rod stepper motor adaptor cable. * We tried to install the BF LVDT cable but first we encountered trouble routing it, and then several wires broke at the D-Sub end. * We laid 6 in-air cables from the tank to the PR2 rank for BF and SF picos, steppers and LVDTs. * We lifted the BF/IRM/IM/RM/BS section to weigh it and check its balance. * It was 195.6 kg, which is 18 kg(!) less than the capacity of the SF. * There was a major imbalance in roll: with all four built-in trim masses moved up the +Y end, it still needed 270 g of extra trim mass to be level. This can probably be made up easily by designing the 18 kg of extra mass appropriately. * Unfortunately when we put the payload, the IM was slightly yawed and ended up on the horizontal EQ stop screws. This let the IM-BF maraging rod go slack, which disturbed the leveling of the IM (because every time it is picked up the maraging rod settles in a different place, giving a different suspension point). * We removed the end panels of the IRM to get access to the IM and rearranged the trim mass on the the IM to get it balance to bubble-level precision. (We still need to do fine pitch adjustment with the OL so that the BS is at the right angle, secure the trim mass properly and replace the IRM panels and OSEMs.) * Miyakawa-san and Yamamoto-san redid the cabling from the computer room to the PR2 rack and expected to finish by lunchtime on Friday. * Hirata-san * Did parts and fastener lists for the SR payload. * Did a 3D model with the SR suspension on the BS assembly frame (to help Mark make adjustments to the frame design). * Did 2D drawings of Fabian's concept for BS EQ stop parts. * Did a 3D model of a wire clamp with replaceable jaw parts (to avoid having to reuse parts with scars from pressure). * Did 2D drawings of a new wire clamps for on top of the BS and SR RMs. * BF issue * The BF has three issues that may or may not be related: * The keystone is sitting at an angle, which means: * The bottom of the keystone just barely clears the magnet yoke without rubbing. * The suspension point for the IM rod is offset, so the BF does not hang level, even with all built-in trim masses moved to their limits (an additional 270 g stacked on the +Y side of the cap is required). * The load capacity is slightly less than measured by Hirata-san during tuning at the ATC. * The frequency is rather higher than measured by Hirata-san. * Also, the BF/IRM/IM/RM/BS system is 18.1 kg light (195.6 kg) compared to the load capacity of the SF (213.7 kg). |
=== 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. * Test picos and steppers more fully. |
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.
- Test picos and steppers more fully.