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| * Mark and Fabian debugged the rubbing issue with the BS. It turns out the EQ stops between the IRM and IM are so misaligned that they can't be used at all. This misalignment was noted on 10/17 klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=2090|2090]] but seems to have gotten worse. With the stops removed, the OSEMs are still fairly well centered, so the problem probably predates the earthquake of 11/1. * Mark worked on the PR2 rack: * Rearranged the items in the rack to make space for new AA and AI chassis at the bottom near the IO chassis. * Replaced the AA chassis, which had had a group of channels marked as bad by Michimura-san. * Installed a second AA chassis and a second AI chassis in the rack. * Installed a second ADC card and a second DAC card in the IO chassis. * Modified the k1ioppr2 real-time model to recognize the new ADC/DAC cards and also the extra DIO cards installed previously. * Attempted to modify the k1visbs real-time model to recognize the new ADC/DAC cards. Unfortunately, apparently due to changes to library parts made by Okutomi-san, neither the original model or Okutomi-san's new model can be successfully compiled and installed anymore! Debugging is ongoing. * Fabian finished the redesign of the EQ stops for the BS RM. Hirata-san will refine the 3D design and do drawings (estimated 1/2 day). * Fabian redesigned the cable clamp on top of the multi-purpose cube (on the RM) to avoid the need for clips. (These are too easily moved if the cables are moved during installation and removal of the safety bar between the RM and IM, which has to be done many times.) * Mark and Fabian reviewed the previous iJect payload parts order and flagged the items that need updating. * Mark worked on task lists and schedule. * Hirata-san finished the PR/SR mirror box modifications. * Hirata-san washed parts (screws and collets). |
=== Type B (Mark) === ==== 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. |
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| ==== Plan for coming weeks ==== For more detail, see [KAGRA/Subgroups/VIS/TypeB/ToDo]. 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. |
Scraps of text for incorporation in the VIS Meeting Minutes
KAGRA/Subgroups/VIS/MeetingNAOJ
Type B (Mark)
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.
Plan for coming weeks
For more detail, see [KAGRA/Subgroups/VIS/TypeB/ToDo]. 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.