[Hallb-engineering] Bumps in the Torus supply pressure
kashy at jlab.org
Thu Jan 13 16:49:56 EST 2011
I was just told that the Torus has been having pressure spikes in the
Krister and I discussed putting a vacuum pump on the dewar return line.
There will be a TPE magnet chicane flip at 08:00 tomorrow and this will
be a good time to check the vacuum. The request for controlled access
will be at 07:40 per Brian. When the hall is open a few techs should go
there and feel u-tubes (target supply, Buffer dewar return and supply
mostly) look for the standard water condensation or ice or just cold
I found that the bumps are coincident with the CryoTarget fills!
Just now I had Krister lower the buffer dewar pressure set point to from
1400 to 1300 and raise the minimum on EV8210 to 52%. I'm not sure if
this will help.
Other ideas to reduce the bump level are:
1) Bring the min and max for the batch fill low and high level setpoints
2) Go to continuous fill (should work but makes lots of ice)
Hopefully it is as simple as weak vacuum.
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