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    User name dalton

    Log entry time 09:41:38 on August 22, 2009

    Entry number 285184

    keyword=Beam update

    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.