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Revision 127 as of 2017-02-24 13:38:24
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Revision 128 as of 2017-03-03 13:29:51
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Editor: MarkBarton
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 * We improvised a solution for ballast mass on the BF, using some heavy dog clamps meant for pedestals, washed and wrapped in foil. We we use them for the duration of the BS Test Hang and then swap them out for custom masses.
 * We put back the original BF jacks (replacing the cantilevered jacks that had been borrowed from the SF level to allow access to the BF blade screws).
 * We rearranged the BS rack, closing the gaps between boxes (per request of Miyakawa-san. We also renumbered some boxes, connectors and cables so as to use zero-based numbering (#0, #1, #2,...) throughout.
 * We routed the OSEM cables into the external cable rack (rather than through the PR2 area).
 * We connected up the BF LVDT, and BF fishing rod stepper motor.
 * We installed a signal generator for the LVDT.
 * We connected the super motor driver box to the Internet and attempted to set it up, but with no success so far.
 * We found the final picomotor driver (we have been using the one from TAMA in the clean booth).
 * We found many items that we will need soon, including the copper ring for the SF.
 * We found issues with the digital system (the computer driving the rack had been changed from k1pr2 to k1bs, which causes problems) and worked with DGS to fix them. It now mostly works but the real-time model crashes from time to time.
 
 * With help from Kokeyama-san and Miyakawa-san, we debugged a problem with the real-time model freezing, which turned out to be the IO chassis shutting down because of brownout condition from an overloaded AC circuit. A combination of extra boxes added to the rack, plus surge current from the air shower could draw the full 20 A limit of the circuit. Awai-san ran a cable to a separate circuit and we moved the IO chassis onto that.
 * We got the stepper motor cabling and driver working, and tested the BF fishing rod stepper motor.
 * We got the LVDT cabling, driver and associated parts of the real-time model working.
 * We found all the parts for the SF and the SF section of the security structure, and prepared the SF. However we then removed the Cu ring from the top cap for recleaning.
 *

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, Hirata-san):

  • With help from Kokeyama-san and Miyakawa-san, we debugged a problem with the real-time model freezing, which turned out to be the IO chassis shutting down because of brownout condition from an overloaded AC circuit. A combination of extra boxes added to the rack, plus surge current from the air shower could draw the full 20 A limit of the circuit. Awai-san ran a cable to a separate circuit and we moved the IO chassis onto that.
  • We got the stepper motor cabling and driver working, and tested the BF fishing rod stepper motor.
  • We got the LVDT cabling, driver and associated parts of the real-time model working.
  • We found all the parts for the SF and the SF section of the security structure, and prepared the SF. However we then removed the Cu ring from the top cap for recleaning.

Plan for coming weeks

Next week:

  • Everyone (Mark, Fabian, Enzo, Hirata-san) at Kamioka, Monday-Thursday.
  • Work on electronics, possibly suspend and weigh BF.

Week after next:

  • Everyone (Mark, Fabian, Enzo, Hirata-san) at Kamioka, Monday-Friday.
  • Add SF and suspend BF.

KAGRA/Subgroups/VIS/TypeB/Minutes (last edited 2022-04-22 13:34:51 by fabian.arellano)