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| ==== Past week report ==== At Kamioka (Mark, Fabian, Enzo, Perry, Hirata-san): |
==== Report for week of 3/12 ==== * We helped Mirapro close up the BS tank, and did last minute checks and adjustments, including using the fishing rods to reset the GAS keystones to mid-range according to the LVDTs. (The F0 had risen so far (≈7 mm) due to temperature changes that it was touching the upper keystone stop screws and defeating the vibration isolation. We operated the F0 FR manually while the tank lid was off.) * We installed electronic boxes in the SR3 and SRM racks. Rack internal cabling and in-air cabling to SR3 still needs to be done. * Hirata-san disassembled two BFs (one SF BF with a tilted keystone and the BS Test Hang BF) and characterized all 10 available SR BF blades. He found they fell into a group of 6 strong ones and a group of 4 weak ones, so he divided the 6 into two matched sets and rebuilt the two filters. * We noticed that the bottom level of SR2 suspension had developed a significant yaw (enough to foul on the security structure), probably introduced when we picked the chain up to weigh it, so we lifted the suspension again and corrected it. * We aligned the SR2 ready for TFs. We noticed that the IM/... section had a noticeable roll (≈20 mrad) but we were unable to correct it with the IM roll pico (the pico runs but the roll does not change, probably because there is too much friction for the mass return spring). We will see if the TFs look OK and then decide whether to try correcting the roll. * We gathered items for OSEM assembly by Enzo, Shoda-san and others at Mitaka next week, and for geophone assembly by Fujii-kun and Kozu-kun at Kamioka. Hirata-san ordered some M8x35 screws that we didn't have enough of. * We took delivery of the blade bases for the LBB dampers. * Hirata-san packed up two SF caps (the original one from the SR2 SF) and a spare, for remachining by Mirapro. He also packed up the dummy BS for shipment to Mitaka for soaking off the sapphire prisms. |
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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. |
==== Plan for week of 3/19 ==== * Fujii-kun and Tanioka-kun join. * Mark at LVC meeting * Fujii-kun at Kamioka (including Wed 3/21) * Kozu-kun at Kamioka Mon-Tue. * All others at Mitaka * -- * Put four geophones in pods. * Make two sets of IM OSEMs * Make last in-air pico adapter cable * Make three in-air stepper splitter cables for SR2, SR3 and SRM. * Set up Dummy BS prism removal. |
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| ==== Plan for coming weeks ==== For more detail, see [[KAGRA/Subgroups/VIS/TypeB/ToDo]]. |
==== Plan for week of 3/26 ==== * Mark vacation. * Shoda-san at Mitaka * Others at Kamioka * -- * Lay SR3 in-air cabling. * Finish rebuild of second BF. * SF Check * Check load capacity. * Check fit of caps. * Add cable clamps to bases. * Add cable clamps and Cu segments to caps (only if they fit well). * Cable LVDTs and steppers. |
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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. |
==== To-Do Lists, Schedule ==== * [[KAGRA/Subgroups/VIS/TypeB/March2018]] * [[KAGRA/Subgroups/VIS/TypeB/April2018]] * [[KAGRA/Subgroups/VIS/TypeB/ToDoBS]] * [[KAGRA/Subgroups/VIS/TypeB/ToDoSR]] * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7779|JGW-L1807779-v1 Type B Schedule (SR)]] |
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| Week of 5/1: * No activity (Golden Week). |
==== Vacation Info ==== * Mark at LVC, then vacation, 3/18 (Sun) - 4/1 (Sun) * Hirata-san vacation, Mon 3/5. * Fabian vacation, 3/26-4/27 (then gone). |
Scraps of text for incorporation in the VIS Meeting Minutes
KAGRA/Subgroups/VIS/MeetingNAOJ
Type B (Mark)
Report for week of 3/12
- We helped Mirapro close up the BS tank, and did last minute checks and adjustments, including using the fishing rods to reset the GAS keystones to mid-range according to the LVDTs. (The F0 had risen so far (≈7 mm) due to temperature changes that it was touching the upper keystone stop screws and defeating the vibration isolation. We operated the F0 FR manually while the tank lid was off.)
- We installed electronic boxes in the SR3 and SRM racks. Rack internal cabling and in-air cabling to SR3 still needs to be done.
- Hirata-san disassembled two BFs (one SF BF with a tilted keystone and the BS Test Hang BF) and characterized all 10 available SR BF blades. He found they fell into a group of 6 strong ones and a group of 4 weak ones, so he divided the 6 into two matched sets and rebuilt the two filters.
- We noticed that the bottom level of SR2 suspension had developed a significant yaw (enough to foul on the security structure), probably introduced when we picked the chain up to weigh it, so we lifted the suspension again and corrected it.
- We aligned the SR2 ready for TFs. We noticed that the IM/... section had a noticeable roll (≈20 mrad) but we were unable to correct it with the IM roll pico (the pico runs but the roll does not change, probably because there is too much friction for the mass return spring). We will see if the TFs look OK and then decide whether to try correcting the roll.
- We gathered items for OSEM assembly by Enzo, Shoda-san and others at Mitaka next week, and for geophone assembly by Fujii-kun and Kozu-kun at Kamioka. Hirata-san ordered some M8x35 screws that we didn't have enough of.
- We took delivery of the blade bases for the LBB dampers.
- Hirata-san packed up two SF caps (the original one from the SR2 SF) and a spare, for remachining by Mirapro. He also packed up the dummy BS for shipment to Mitaka for soaking off the sapphire prisms.
Plan for week of 3/19
- Fujii-kun and Tanioka-kun join.
- Mark at LVC meeting
- Fujii-kun at Kamioka (including Wed 3/21)
- Kozu-kun at Kamioka Mon-Tue.
- All others at Mitaka
- --
- Put four geophones in pods.
- Make two sets of IM OSEMs
- Make last in-air pico adapter cable
- Make three in-air stepper splitter cables for SR2, SR3 and SRM.
- Set up Dummy BS prism removal.
Plan for week of 3/26
- Mark vacation.
- Shoda-san at Mitaka
- Others at Kamioka
- --
- Lay SR3 in-air cabling.
- Finish rebuild of second BF.
- SF Check
- Check load capacity.
- Check fit of caps.
- Add cable clamps to bases.
- Add cable clamps and Cu segments to caps (only if they fit well).
- Cable LVDTs and steppers.
To-Do Lists, Schedule
Vacation Info
- Mark at LVC, then vacation, 3/18 (Sun) - 4/1 (Sun)
- Hirata-san vacation, Mon 3/5.
- Fabian vacation, 3/26-4/27 (then gone).