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User name E. Schulte
Log entry time 11:56:15 on November 05, 2007
Entry number 212658
keyword=Loss He Expected
We are expecting a discontinuation of service of helium form CHL sometime
over the next 24 hours. This will require our cryotargets to warm up
while the vaporizer for the CHL and the return line is defrosted. To
compensate for this, and make sure the Helium data is collected, we will
be taking ALL of the Helium data for all kinematic settings at 60 degrees
first, followed by the lead settings. This way, if the cryo group
decides that things are getting worse much faster than they expected, we
don't loose the helium and lead data at this beam energy. We are
expecting to perform a pass change tomorrow so we can't easily go back to
collect these data points once we leave this pass.
The current plan is:
All He settings will be taken on the Left arm, and those which we can get
with the Right. Repeat for the Pb target. this is, of course, less than
ideal, but I'm trying to do what I can insure that we can get the
cryo-dependent data should things go bad fast.