User name Glesener
Log entry time 08:11:01 on July23,2005
Entry number 149142
keyword=Target screen shot
One last screen shot--fairly normal conditions, although CHL jumped a minute
Suggestions for managing the CHL flow fluctuations:
If no beam or low current, close JT valve a bit so that sudden jumps in the
flow don't take it over 25 g/s.
Sudden rises in CHL flow seem to be followed by extreme drops. Changes to the
JT valve seem to cause fluctuations about 5 minutes later. Fluctuations are
often associated with changes in the beam (beam trips, beam back).
If a sudden drop occurs, immediately turn off beam. This should get the heat
load back to a point where the HPH can regulate. If it is necessary to open
the JT valve more, make it a small step.
Watch the screens whenever possible in order to catch fluctuations when they
Note: earlier we turned beam compensation off because we thought the HPH was
jumpy. This was probably not the problem, but it is still off.