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• VISMinutes20151222

PR2 wire breaker meeting

Participants: Tatsumi, Flaminio, Kimura, Barton, Suzuki, Tomaru, Aso, Takahashi, Ohishi, Hirose, Fabian, K Yamamoto, Ohashi

1. What happened (Tatsumi)

   • http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4701

   • PR2 wire breakers (two of them) developed cracks after gluing
   • The glue used is EP30-2 from Masterbond.
   • We need to remove them first
2. Information from LIGO (Mark, Hirose)
   • Hirose
     • LIGO tried heat, acetone and other chemicals to remove EP30-2
     • Acetone soaking is the best: easy and less intrusive to the coating
     • May take a long time (up to a month)
   • Mark
     • According to a LIGO engineer who did the acetone soaking, average time for removal is 40 huors.

     • A possible configuration: http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4702

3. What shall we do ?
   • Project member: Mark, Hirose and Tatsumi (sample preparation)
   • Target date for removal: Jan 22 (Jan 15 is better if possible)
   • Location
     • Need to consider the acetone usage in choosing a work location: we can use a normal lab. if the evaporation rate of acetone from the removal system is less than 75ml/h.
     • Evaporation rate depends on the configuration of the acetone soaking system
     • If a room with proper ventilation is necessary, the optics lab in the ATC is available.
   • Next Tasks
     • Mark and Hirose will discuss and come up with a more concrete plan for the removal test
     • Tatsumi will prepare test pieces