[Hallb] HPS installation

blenzer blenzer at jlab.org
Mon Mar 2 14:17:39 EST 2015

Dear Stepan:

Congratulations! A job well done!


On 3/1/2015 8:51 PM, Stepan Stepanyan wrote:
> Dear all,
> I am pleased to inform you that the installation of the SVT has
> been completed successfully yesterday. We also were able to
> close the vacuum and start pumping down downstream part
> of the beamline, from the second girder to the dump. As of
> now, gauge at 2H02 girder reads 7.5E-5. Considering how much
> stuff we put in the vacuum chamber, the vacuum level after only
> a day of pumping, with chillers for SVT and FEB running is a
> good sign. Overall, vacuum in the beamline has been improved
> dramatically, see attached. The remaining 5 meters long stretch
> of the beamline through the tagger yoke will be pumped down
> Monday or Tuesday.
> Many thanks to the Hall-B engineering group for a great support.
> Especial thanks to Denny and Todd who supported the SVT installation,
> leak check of the cooling lines, and buttoning up the beamline and
> pumping it down on Saturday.
> Regards, Stepan
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