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| At Kamioka (Mark, Fabian, Enzo, Perry, Hirata-san): | At Kamioka (Enzo): * Enzo (with help from Miyo-kun) fixed the broken actuation coil on PI LVDT #0. * Enzo worked on the final cabling plan for BS and SRx. * Enzo replaced the LVDT driver again to have one with no dead channels (and free up the partly non-working cards for servicing). |
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| * Realized that the SF/BF/... section doesn't need 6 kg added, it needs 6 kg ''removed'', but none to remove. The 20 kg extra in the BF to match the SF GAS filter makes the whole chain overload the PI GAS filter. * Lifted the SF/BF/... section to check for net weight and balance. Was 307 kg (cf. G&M's measurement of 301 kf in 2012 for the F0). Can be balanced with only 63 g extra. * Went to build up the LBB blade units but discovered that the holes in the base of the blades are two small (are Ø11 mm; should be Ø12 MM). 3D CAD was correct - error was in the 2D drawing. Shipped the blades away for modification. * Tested the SF LVDT actuation and worked on debugging it. Still not working. * Prepared the PI for being lifted, and the top of the assembly frame for receiving it. * Searched for and found the old PI-SF rod. * Did safety improvements after Enzo hit his head on a flange bolt: reversed all the bolts on the ±X sides of the BS and put caution tape on them. * Debugged Kokeyama-san's changes to the real-time model for the DIO, and started on TFs to check the output filter compensation is working. |
At Mitaka and Kashiwa (Mark, Hirata-san, Fabian, Enzo): * We glued magnets into their holders. * We did a walk-through of the gluing procedure at Mitaka and discovered that the secondary prisms were missing. * We took the mirror box and gluing tools to Kashiwa to do as much of the gluing as possible. * Hirose-san applied First Contact to the BS and he and Kieran moved it into the mirror box. * We practiced putting sapphire prisms on the BS but didn't apply glue. * We tried the magnet gluing jigs designed by Aso-san and found two major issues: the overall length was about 25 mm too long, and there was no adjustment to allow for the wedge. * We designed a simple modification to the jigs that hopefully would be trivial for the ATC to do: the jigs will be cut in half and the bottom section will be mounted with adhesive on an 11 mm rod that slides in the central hole of the top section. Thus the top half can be screwed into the existing recess, and the bottom half with the magnets and glue can be allowed to drop about 3 mm onto the face of the optic. Hirata-san worked with ATC to get this done and it should be ready today (Friday 7/7). * Hirata-san also got ATC to make some jigs to hold the old 5-mm prisms so that they can be ground down to 3 mm to replace the missing ones. Hirata-san will do the grinding himself today (Friday 7/7/). * We decided to continue the gluing work at Kamioka, so we brought the BS back to Mitaka and will ship it on to Kamioka next Tuesday. * Hirata-san did a version of the 3D CAD with the as-built BS Test Hang configuration. |
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| ==== Plan for coming weeks ==== For more detail, see [[KAGRA/Subgroups/VIS/TypeB/ToDo]]. |
==== Plan for weeks of 7/10, 7/17 ==== Mark, Enzo mostly at Kamioka. * More TFs. * Receive BS at Kamioka, do gluing if possible. * Document LVDT driver rebuild and other changes. * Learn how Miyo-kun's pico driver software works and make fixes/improvements. * Design/install matrices, blend filters and damping filters. * Finish tidying rack and labeling cables. * Add temporary ballast to LBB and find total required. * Try rearranging arc weights to make room for magic wand. * Start on creating SR3 rack. * Preparation for BF rebuild. Fabian, Hirata-san at Mitaka. * Clean BS secondary prisms and modified gluing jigs (Hirata-san). * Ship gluing tools and BS to Kamioka. * Do new 3D CAD for final BS install (Hirata-san): * On-assembly-frame version. * In-tank version. * Design SR assembly frame (Fabian). * Do 2D Drawings and procurement of final IM/BF/SF ballast masses (Hirata-san). * Other purchasing and preparation (spare BS clamps, suspension wire, 8-mm rod receptacles) * Do mass budget for LBB - design ballast masses (Fabian) |
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| Week of 4/24 (four-day week): * Crane in PI. * Connect SF/BF... section and see if we're indeed overweight and by exactly how much. * Finish debugging SF LVDT actuation. Week of 5/1: * No activity (Golden Week). |
Vacation Info: Hirata-san: Thu 7/20 through Mon 7/24 Enzo: Sat 7/22 through Sun 8/6 Fabian: Fri 8/4 through Mon 8/21 Mark: TBD Mid-Oct |
Scraps of text for incorporation in the VIS Meeting Minutes
KAGRA/Subgroups/VIS/MeetingNAOJ
Type B (Mark)
Past week report
At Kamioka (Enzo):
- Enzo (with help from Miyo-kun) fixed the broken actuation coil on PI LVDT #0.
- Enzo worked on the final cabling plan for BS and SRx.
- Enzo replaced the LVDT driver again to have one with no dead channels (and free up the partly non-working cards for servicing).
At Mitaka and Kashiwa (Mark, Hirata-san, Fabian, Enzo):
- We glued magnets into their holders.
- We did a walk-through of the gluing procedure at Mitaka and discovered that the secondary prisms were missing.
- We took the mirror box and gluing tools to Kashiwa to do as much of the gluing as possible.
- Hirose-san applied First Contact to the BS and he and Kieran moved it into the mirror box.
- We practiced putting sapphire prisms on the BS but didn't apply glue.
- We tried the magnet gluing jigs designed by Aso-san and found two major issues: the overall length was about 25 mm too long, and there was no adjustment to allow for the wedge.
- We designed a simple modification to the jigs that hopefully would be trivial for the ATC to do: the jigs will be cut in half and the bottom section will be mounted with adhesive on an 11 mm rod that slides in the central hole of the top section. Thus the top half can be screwed into the existing recess, and the bottom half with the magnets and glue can be allowed to drop about 3 mm onto the face of the optic. Hirata-san worked with ATC to get this done and it should be ready today (Friday 7/7).
- Hirata-san also got ATC to make some jigs to hold the old 5-mm prisms so that they can be ground down to 3 mm to replace the missing ones. Hirata-san will do the grinding himself today (Friday 7/7/).
- We decided to continue the gluing work at Kamioka, so we brought the BS back to Mitaka and will ship it on to Kamioka next Tuesday.
- Hirata-san did a version of the 3D CAD with the as-built BS Test Hang configuration.
Plan for weeks of 7/10, 7/17
Mark, Enzo mostly at Kamioka.
- More TFs.
- Receive BS at Kamioka, do gluing if possible.
- Document LVDT driver rebuild and other changes.
- Learn how Miyo-kun's pico driver software works and make fixes/improvements.
- Design/install matrices, blend filters and damping filters.
- Finish tidying rack and labeling cables.
- Add temporary ballast to LBB and find total required.
- Try rearranging arc weights to make room for magic wand.
- Start on creating SR3 rack.
- Preparation for BF rebuild.
Fabian, Hirata-san at Mitaka.
- Clean BS secondary prisms and modified gluing jigs (Hirata-san).
- Ship gluing tools and BS to Kamioka.
- Do new 3D CAD for final BS install (Hirata-san):
- On-assembly-frame version.
- In-tank version.
- Design SR assembly frame (Fabian).
- Do 2D Drawings and procurement of final IM/BF/SF ballast masses (Hirata-san).
- Other purchasing and preparation (spare BS clamps, suspension wire, 8-mm rod receptacles)
- Do mass budget for LBB - design ballast masses (Fabian)
Vacation Info: Hirata-san: Thu 7/20 through Mon 7/24 Enzo: Sat 7/22 through Sun 8/6 Fabian: Fri 8/4 through Mon 8/21 Mark: TBD Mid-Oct