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| ==== Report for week of 3/13 ==== At Kamioka (Mark, Fabian, Enzo, Perry, Hirata-san): * 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. |
==== Past week report ==== At Kamioka (Mark, Ohishi-san, Fabian, Enzo, Hirata-san, Yoshioka-kun, Kozu-kun): * We characterized the remachined LBB blades, chose three and installed them in the LBB blade units in the PI. * We removed all sticky labels from the PI and cleaned the affected areas (and as much as possible of the rest of the surface) with ethanol. * We rearranged the arc weights on the PI to make space for the magic wand and installed the magic wand. * We rearranged the magnets on the SF damper ring to suit three Cu segments (instead of two as in the test hang). * We put proper vacuum-compatible tubing around all the stepper motor connections on the top of the PI (replacing cling wrap). * We craned out the SF temporarily and retrieved the lost PEEK cable clamp collet from the BF. * We closed the BF, craned the SF back in, and hooked the BF/..., this time with the hex cable clamp. * We routed cables from the BF via the hex cable clamp to the SF level. * We adjusted the BF trim mass for pitch, roll and vertical, and got the IRM hanging symmetrically around the IM. * We adjusted all the IRM OSEMs laterally and in/out. * We calibrated the SF LVDT and tested the SF FR stepper. * We suspended the SF/... section and weighed it but found the old 7-mm maraging rod adapter did not hold it at the center, so we had to lift it with slings and could not accurately trim it for pitch/roll. * Therefore we brought forward the craning in of the PI with the SF damper ring hanging from it. * We suspended the SF successfully from the PI and unlocked the F0 keystone to check the mass budget. We needed about 1.5 kg extra, which is about right considering the hex cable clamp and cables. * However we had to leave out the F0-SF hex cable clamp because of a bad thread on the inside of the cap. Hirata-san will make a new cap by enlarging the 7-mm hole in an old cap to 8 mm. |
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| ==== Plan for coming weeks ==== Next week: * Everyone (Mark, Fabian, Enzo, Perry Hirata-san) at Kamioka, Monday-Friday except for Hirata-san Wednesday-Friday). * Finish SF installation. * Finish BF cabling, hang BF/IRM/IM/RM/BS from SF and confirm weight matches load capacity. * Re-trim BF as necessary. * Get picomotor driver working. Week after next: * Everyone (Mark, Fabian, Enzo, Hirata-san) at Kamioka, Monday-Friday. * Prepare for PI installation. |
==== Plan for week of 9/4 ==== ==== Plan for week of 9/13 ==== Mark (except Wed), Fabian (except Mon, Tue), Enzo, Ohishi-san (except Mon-Wed), Hirata-san, Yoshioka-kun (Tue, Wed, Fri), Kozu-kun * Reinstall F0-SF rod, this time with hex cable clamp. * Route cables. * Adjust SF trim mass, adjust tilt and vertical. * Adjust SF damper gap. * Cable and test IP LVDTs. * Cable and test F0 LVDT. * Cable and test PI steppers. * Cable and test geophones. * ==== Vacation Info ==== Mark: 10/16-24 |
Scraps of text for incorporation in the VIS Meeting Minutes
KAGRA/Subgroups/VIS/MeetingNAOJ
Type B (Mark)
Past week report
At Kamioka (Mark, Ohishi-san, Fabian, Enzo, Hirata-san, Yoshioka-kun, Kozu-kun):
- We characterized the remachined LBB blades, chose three and installed them in the LBB blade units in the PI.
- We removed all sticky labels from the PI and cleaned the affected areas (and as much as possible of the rest of the surface) with ethanol.
- We rearranged the arc weights on the PI to make space for the magic wand and installed the magic wand.
- We rearranged the magnets on the SF damper ring to suit three Cu segments (instead of two as in the test hang).
- We put proper vacuum-compatible tubing around all the stepper motor connections on the top of the PI (replacing cling wrap).
- We craned out the SF temporarily and retrieved the lost PEEK cable clamp collet from the BF.
- We closed the BF, craned the SF back in, and hooked the BF/..., this time with the hex cable clamp.
- We routed cables from the BF via the hex cable clamp to the SF level.
- We adjusted the BF trim mass for pitch, roll and vertical, and got the IRM hanging symmetrically around the IM.
- We adjusted all the IRM OSEMs laterally and in/out.
- We calibrated the SF LVDT and tested the SF FR stepper.
- We suspended the SF/... section and weighed it but found the old 7-mm maraging rod adapter did not hold it at the center, so we had to lift it with slings and could not accurately trim it for pitch/roll.
- Therefore we brought forward the craning in of the PI with the SF damper ring hanging from it.
- We suspended the SF successfully from the PI and unlocked the F0 keystone to check the mass budget. We needed about 1.5 kg extra, which is about right considering the hex cable clamp and cables.
- However we had to leave out the F0-SF hex cable clamp because of a bad thread on the inside of the cap. Hirata-san will make a new cap by enlarging the 7-mm hole in an old cap to 8 mm.
Plan for week of 9/4
Plan for week of 9/13
Mark (except Wed), Fabian (except Mon, Tue), Enzo, Ohishi-san (except Mon-Wed), Hirata-san, Yoshioka-kun (Tue, Wed, Fri), Kozu-kun
- Reinstall F0-SF rod, this time with hex cable clamp.
- Route cables.
- Adjust SF trim mass, adjust tilt and vertical.
- Adjust SF damper gap.
- Cable and test IP LVDTs.
- Cable and test F0 LVDT.
- Cable and test PI steppers.
- Cable and test geophones.
Vacation Info
Mark: 10/16-24