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| ==== Report for week of 3/13 ==== | ==== Past week report ==== |
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| * We took a full set of TFs with the BF stationary but the IRM, IM, RM and TM all hanging. * We marked peeling or damaged areas on the clean booth floor for Furuta-san. * We installed the SF, measuring its weight in the process. * We found the crossbars supporting the SF jacks were too high to allow the SF ring to sit on the pillars while also being partially supported by the jacks. (This was an issue with the 3D CAD - the model of the NB-01 jack had a lower minimum height than reality.) We lowered the crossbars by 5 mm and put thicker spacers (12 mm instead of 3 mm) on top of the jacks supporting the SF and everything worked well. * We installed newly cleaned L-brackets under the BF and SF. * We installed a new-style cable clamp under the SF. (This was easier with the SF on the security structure, so we had not done it earlier.) * We installed the SF-BF rod and hex cable clamp. * We suspended the BF/IRM/IM/RM/BS section and found it was light, presumably because it had been trimmed according to the Promec measurement of the SF, not Hirata-san's later value. * We added extra ballast mass corresponding to the difference and found the BF section floated at a good height. * We moved trim mass around on the BF until it hung level, and adjusted the IRM and OSEMs until the IRM-IM EQ stops were well-centered and all the OSEMs were centered laterally and mid-range. * We ran 11 extra 20-m in-air cables from the tank towards the rack. (We will need to add 10-m extensions.) * We connected most of the cables to the vacuum flanges with screws and anti-feedthrough adapters. (Some remain to be done.) * We debugged a 900 Hz ringing in the BF LVDT, which turned out to be because the damping was enabled without appropriate filters or gains. * We debugged excess noise in the TM-H3 OSEM, which turned out to be mostly due to a faulty cable. However we worry that some of it may be due to some extensions made of non-vacuum-compatible ribbon cable which we added because the TM-H2 and -H3 OSEM cables are too short. * We installed new security structure parts at the RM level. * We found all the parts for the lower breadboard suspension, including the blades, blade bases, associated cable clamps etc. We also found the jigs for installing the blades. * Fabian finalized the BF ballast mass design and started on the SF. ==== Report for week of 3/21 ==== At Kamioka (Mark, Fabian, Enzo, Perry, Hirata-san): * We took a full set of TFs with the SF stationary but the BF, IRM, IM, RM and TM all hanging. * We also did a TF from BF LVDT actuation and confirmed that it was working. * We got SUMCON running on Perry's computer and worked out how to do cut-down versions of Fabian's full Type-B model corresponding to the various partial configurations we have data for. |
* 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 pig 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 cleared space for the PR2 team to remove a bellows from their tank. * We installed safety bars near the assembly frame at about waist height for someone on the tall ladder. We reinforced the clamps with cable ties. * 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 removed the SF cap and stored it on crossbars within the assembly frame. * 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 removed one segment of the Cu ring on the SF cap and reconfigured the rest 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 , |
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| Week of 3/21: * Lots of electronics: BF picos, SF LVDT and stepper, routing of in-vac cabling past SF, in-air cabling for PI. * Pick up and weigh entire system from SF down. * Prepare PI: reattach LVDT double coils, install FR and magic wand. * Prepare LBB blade units. * Clear floor for re-coating. Week of 3/27: * f2f Meeting |
Week of 5/15: * Enzo from Tuesday 5/16 (driving test), rest of team from Monday. * Fix PI-SF rod jamming. * Remove PI and SF cap. * Continue debugging SF LVDT. * Reconfigure Cu damper ring on SF. * Add magnets to upper SF damper ring. * Add cable clamps on the PI (a few places are inaccessible when the PI is on the assembly frame). * 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. |
Scraps of text for incorporation in the VIS Meeting Minutes
KAGRA/Subgroups/VIS/MeetingNAOJ
Type B (Mark)
Past week report
At Kamioka (Mark, Fabian, Enzo, Perry, Hirata-san):
- 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 pig 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 cleared space for the PR2 team to remove a bellows from their tank.
- We installed safety bars near the assembly frame at about waist height for someone on the tall ladder. We reinforced the clamps with cable ties.
- 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 removed the SF cap and stored it on crossbars within the assembly frame.
- 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 removed one segment of the Cu ring on the SF cap and reconfigured the rest 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 ,
Plan for coming weeks
For more detail, see KAGRA/Subgroups/VIS/TypeB/ToDo.
Week of 5/15:
- Enzo from Tuesday 5/16 (driving test), rest of team from Monday.
- Fix PI-SF rod jamming.
- Remove PI and SF cap.
- Continue debugging SF LVDT.
- Reconfigure Cu damper ring on SF.
- Add magnets to upper SF damper ring.
- Add cable clamps on the PI (a few places are inaccessible when the PI is on the assembly frame).
- 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.