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

burkert burkert at jlab.org
Thu Sep 10 15:11:39 EDT 2009

Great work!

kashy at jlab.org wrote:
> 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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