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User name eschulte
Log entry time 17:11:50 on October 17, 2006
Entry number 187416
keyword=CHL Flow & the Cryo Target
The 4K Flow from CHL dropped again around 16:00, warming the target up to
about 25 degrees C. We called J. P. an asked him to contact the cryo
group, as this seems to be becoming a late afternoon habbit. It turned
out that to keep the flow rate high enough to prevent overpressure in the
CHL return lines, the cryo group fed some 4K to the ESR. The cryo group,
after talking with the target group, removed the extra flow to ESR, since
the target group reported that we were in a stable running condition.
The hall was not informed of this operation. As a result of the removal
of the extra coolant flow, the pressure problem returned and the coolant
flow from the CHL was valved off. This, of course caused the target to
warm up.
It has been decided, then that we should run not less than 7 g/s coolant
flow, keeping the high power heaters around 350 to 400 W with the beam off.
In the event that we loose coolant again, target operators are to do
nothing until the situation stablizes itself, then establish running
conditions.
We are presently working to get the target back.