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User name dalton
Log entry time 09:41:38 on August 22, 2009
Entry number 285184
The vacuum problem overnight was in Arc 9E, affecting 5th pass beam only.
This in principle beam could have been delivered to Halls A and C but
MCC decided to concentrate on fixing the problem rather. The cause of
the leak was some tune mode beam hitting the beam pipe at a vacuum seal
and gradually heating it up until the vacuum was broken. Bolts in this
section were tightened and work is being done on timing and tuning to
prevent this in future.
The current estimate is to have beam into the halls at about noon.