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| ==== Past week report ==== At Kamioka (Mark, Fabian, Enzo, Hirata-san): |
==== Report for week of 3/5 ==== * We removed the non-vacuum-compatible ballast mass from the BS tank. * We secured all the PR2 feedthrough connections with screws. * We grabbed an extra empty rack for SRM and set it up next to the one for SR3 (we will stuff them next week). * We calibrated the SR2 SF LVDT and FR. * We put the SF cap on and lifted and weighed the SF/... section. * We moved the filter building bench and tools into the SRM area and started the rebuild of the two remaining BFs (the one from the BS Test Hang and the one with the tilted keystone). * Mark finished -v2 of the schedule ([[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7779| L1807779]]). * Mark worked on slides for the ASJ and LVC meetings. * Sawada-san postponed the SRM mushroom work to next week and offloaded it to Mirapro. |
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| * Inspected LLB in tank - in a good position, but not very clean - apparent water spots and dirt. * Found the geophone adapter plates. * Retested SF FR stepper - still good. * Finally got SF LVDT working: * Found a short in the primary coil due to Al foil used for mechanical reinforcement at vacuum feedthrough connection. * Did a full calibration and found that linear range was too small (0.75 mm!) and did not cover nominal keystone height. * Decreased gain to increase linear range. * Adjusted the height of the yoke and secondary coil unit to center the linear region around the nominal keystone height. * Implemented velocity damping. * Found all parts for the LBB and damper rings. * Cu segments and some other parts were very dirty - wiped carefully for now, but should be properly cleaned before final install. * Outrigger parts for LBB have M16 thread cut directly into Al but should have had M16 helicoils. This is a galling risk with Ag-coated rod receptacles. Hirata-san organized rework. * Some special lock nuts are in short supply and are being borrowed from supply at ATC for next batch of BFs. * Made remaining two geophone in-air descrambler cables (total three). * Installed a thermometer supplied by Kokeyama-san on the tower around the BS tank. * Prepared the SF damper. * Designed a pattern of magnets for the two-segment arrangement of SF damper and laid it out on the magnet ring with the template. * Moved the Cu segments on SF cap by 30° (the cap had not been in the right position earlier). * Reinstalled PI: * Raised the PI with the crane and hooked the SF damper ring. Some of the rods did not fit the receptacles due to tolerance issue, but by going through a large number of rods and receptacles, we found three working sets. * Craned the PI onto the frame and suspended the SF/... section, this time with the hex cable clamp on the F0-SF rod. * Tensioned the PI yaw return spring, installed (but did not cable) the yaw stepper and adjusted the yaw of the SF/... section. We worry the return spring is not stiff enough. * Installed (but did not cable) the geophones. * Recentered the IP. The extra weight from the geophones (≈42 kg) and SF damper ring (≈17 kg) had brought the IP to near the point of instability, so we removed one arc weight (≈17 kg) and rearranged the other two in the top row to be symmetrical. * Added ballast to set the height of the F0 keystone. We now have about 6 kg in hand (due to removing one of the Cu segments for the SF damper). This should be enough margin for cables, temperature fluctuations etc. |
==== Plan for week of ==== * Shoda-san at Mitaka. * Hirata-san vacation Mon 3/5, then Kamioka * Fabian Mitaka Mon-Tue (COMSOL training), Kamioka Wed-Fri. * Others at Kamioka. * - * '''Remove LBB temporary ballast masses from BS chamber.''' * Finish recovering IM OSEM alignment. * Calibrate SF LVDT. * Lift SF/... section and check total mass and balance. * Get SRM tank mushroom section installed (Hirata-san, Kimura-san) * Set up for rebuilding of two BFs. |
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| ==== Plan for coming weeks ==== For more detail, see [[KAGRA/Subgroups/VIS/TypeB/ToDo]]. |
==== Plan for week of 3/12 ==== * Shoda-san at Mitaka. * Mark at ASJ (Chiba) Fri, then Mitaka. * Hirata-san vacation Mon 3/5; Kamioka Tue-Thu; Mitaka Fri * Others Kamioka Mon-Thu * Install boxes in SR3 and SRM racks. * Lay SR3 in-air cabling. * Continue rebuild of BFs. |
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| Weeks of 5/22, 5/29: * Retest SF stepper every day, to see if problems recur. * Find/install geophone adapter plates or improvise replacement. * Reinstall PI, this time with rods and damper ring. * Reinstall PI-SF rod, this time with hex cable clamp. * Cable/test PI geophones LVDTs and steppers. * Reinstall LBB blade units. |
==== Plan for week of 3/19 ==== * Mark at LVC meeting * All others at Mitaka * 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 week of 3/26 ==== * Mark vacation. * Shoda-san at Mitaka * Others at Kamioka * -- * F0 Prototype Blade Test * Characterize blades. * Choose best set of three. * Remove cracked blades from filter in SRM area. * Set up test weights in SRM area, first floor. * Remove floor panel in SRM area, second floor. * Install chosen blades. * Measure load capacity. ==== 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)]] ==== 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 3/5
- We removed the non-vacuum-compatible ballast mass from the BS tank.
- We secured all the PR2 feedthrough connections with screws.
- We grabbed an extra empty rack for SRM and set it up next to the one for SR3 (we will stuff them next week).
- We calibrated the SR2 SF LVDT and FR.
- We put the SF cap on and lifted and weighed the SF/... section.
- We moved the filter building bench and tools into the SRM area and started the rebuild of the two remaining BFs (the one from the BS Test Hang and the one with the tilted keystone).
Mark finished -v2 of the schedule (L1807779).
- Mark worked on slides for the ASJ and LVC meetings.
- Sawada-san postponed the SRM mushroom work to next week and offloaded it to Mirapro.
Plan for week of
- Shoda-san at Mitaka.
- Hirata-san vacation Mon 3/5, then Kamioka
- Fabian Mitaka Mon-Tue (COMSOL training), Kamioka Wed-Fri.
- Others at Kamioka.
- -
Remove LBB temporary ballast masses from BS chamber.
- Finish recovering IM OSEM alignment.
- Calibrate SF LVDT.
- Lift SF/... section and check total mass and balance.
- Get SRM tank mushroom section installed (Hirata-san, Kimura-san)
- Set up for rebuilding of two BFs.
Plan for week of 3/12
- Shoda-san at Mitaka.
- Mark at ASJ (Chiba) Fri, then Mitaka.
- Hirata-san vacation Mon 3/5; Kamioka Tue-Thu; Mitaka Fri
- Others Kamioka Mon-Thu
- Install boxes in SR3 and SRM racks.
- Lay SR3 in-air cabling.
- Continue rebuild of BFs.
Plan for week of 3/19
- Mark at LVC meeting
- All others at Mitaka
- 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
- --
- F0 Prototype Blade Test
- Characterize blades.
- Choose best set of three.
- Remove cracked blades from filter in SRM area.
- Set up test weights in SRM area, first floor.
- Remove floor panel in SRM area, second floor.
- Install chosen blades.
- Measure load capacity.
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).