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Revision 135 as of 2017-03-21 17:19:53
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Revision 137 as of 2017-04-14 13:36:43
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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.

 * Filed crane adapter ring to make it fit better on the hook.
 * Debugged the BF and SF LVDTs (the signal generator had lost its settings in the rack shutdown).
 * Debugged the TM-H4 OSEM problem (a "Type 3 extension cable had gone bad).
 * Weighed eyebolts used to lie the SF.
 * Shipped the old pico driver and joystick back to Mitaka for Eleonora.
 * Borrowed a second pico driver ("PR3") and set it and "BS" up in the rack.
 * Practiced driving the BF cap picos with the new drivers.
 * (With help from Miyo-kun) got the pico MEDM screens running.
 * Replace the temporary "PR3" driver with a new one "BS_BF", and renamed "BS" to "BS_IM".
 * Checked all the DIO connections to the LPCD and connected up the HPCDs. With help from Kokeyama-san we can now see all the drivers from EPICS.
 * Worked on balancing the BF/IRM/IM... section. Sometime during this work, the IM sank and would not come back to its proper position even with the fishing rod. We put a scale under the RM and found that the imbalance was 488 g. Using the fishing rod we got this down to 235 g, but we found that the direction of the stepper was not consistently related to the direction selected on the driver screen - we had previously noted that "left" was "up, but driving "up" the imbalance would decrease to 235 g and then start increasing again, indicating the stepper had bounced off some obstacle. (There was no obvious sound when this happened, unlike at the low end.)
 * We decided to give up on tuning the height of the IM with the fishing rod and to proceed with the test hang by locking the BF keystone at the desired height.
 * Hirata-san installed the PI fishing rod and magic wand, and did more work on changing the PI LVDT connectors from female to male.
 * Enzo made many edits to the circuit diagram, adding the DIO for the HPCDs and correcting minor mistakes.
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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 4/17:
 * Install temporary ballast mass in SF.
 * Lift SF/BF/... section and check total weight and SF balance.
 * Continue swap of PI LVDT connectors (female->male)
 * Start preparing LBB spring units.
Week of 4/24:
 * Crane in PI.
 * Connect SF/BF... section.
 * Temporarily remove PI and adjust SF ballast if necessary.
 

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):

  • Filed crane adapter ring to make it fit better on the hook.
  • Debugged the BF and SF LVDTs (the signal generator had lost its settings in the rack shutdown).
  • Debugged the TM-H4 OSEM problem (a "Type 3 extension cable had gone bad).
  • Weighed eyebolts used to lie the SF.
  • Shipped the old pico driver and joystick back to Mitaka for Eleonora.
  • Borrowed a second pico driver ("PR3") and set it and "BS" up in the rack.
  • Practiced driving the BF cap picos with the new drivers.
  • (With help from Miyo-kun) got the pico MEDM screens running.
  • Replace the temporary "PR3" driver with a new one "BS_BF", and renamed "BS" to "BS_IM".
  • Checked all the DIO connections to the LPCD and connected up the HPCDs. With help from Kokeyama-san we can now see all the drivers from EPICS.
  • Worked on balancing the BF/IRM/IM... section. Sometime during this work, the IM sank and would not come back to its proper position even with the fishing rod. We put a scale under the RM and found that the imbalance was 488 g. Using the fishing rod we got this down to 235 g, but we found that the direction of the stepper was not consistently related to the direction selected on the driver screen - we had previously noted that "left" was "up, but driving "up" the imbalance would decrease to 235 g and then start increasing again, indicating the stepper had bounced off some obstacle. (There was no obvious sound when this happened, unlike at the low end.)
  • We decided to give up on tuning the height of the IM with the fishing rod and to proceed with the test hang by locking the BF keystone at the desired height.
  • Hirata-san installed the PI fishing rod and magic wand, and did more work on changing the PI LVDT connectors from female to male.
  • Enzo made many edits to the circuit diagram, adding the DIO for the HPCDs and correcting minor mistakes.

Plan for coming weeks

For more detail, see KAGRA/Subgroups/VIS/TypeB/ToDo.

Week of 4/17:

  • Install temporary ballast mass in SF.
  • Lift SF/BF/... section and check total weight and SF balance.
  • Continue swap of PI LVDT connectors (female->male)

  • Start preparing LBB spring units.

Week of 4/24:

  • Crane in PI.
  • Connect SF/BF... section.
  • Temporarily remove PI and adjust SF ballast if necessary.

KAGRA/Subgroups/VIS/TypeB/Minutes (last edited 2022-10-28 10:02:46 by fabian.arellano)