[Hallb] [Hallb-engineering] Sec 5 CC leak

kashy at jlab.org kashy at jlab.org
Thu Sep 10 15:00:37 EDT 2009

Nice going guys!
Thanks for the update.

Could partial retraction of the FC be less work and still allow repair?

>    Calvin and I went into the Hall to investigate the leak in Sec5 CC
> today. Using a bore scope and one of our refrigerant leak detectors I
> was able to find what may be our problem or at least part of it. I was
> able to raise panel 2 TOF's enough to see the bottom window which
> allowed me to leak test part of the vertical edge, side and back. I got
> strong readings at the piping in the lower corner and detected nothing
> above or around that area. From what I can tell one of several things
> may be causing this, movement may have loosened  a coupling, caused a
> stress crack in the piping or pressure from cables and piping may have
> rubbed a hole in the window.  The plus side to this is that I am
> confident that I can repair at least this problem without having to
> remove the detector.  This may not be the only problem but I am fairly
> certain it is a major contributor. I can get a much better idea of what
> else may be a problem when the forward carriage is retracted.
> Thanks
> Denny
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