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    User name R. Michaels

    Log entry time 05:39:08 on June15,2010

    Entry number 326679

    keyword=vacuum during beam ramp up

    Vacuum vs current during ramp. Run 4569.

    First step at is 2 uA.
    Then 5 uA, 10 uA, 20 uA, 30 uA, 40 uA, 50 uA.

    A big excursion occured with 2 uA. At one point (-7 min in the
    graph) the vacuum went above 1e-4 and the FSD tripped the beam.

    We've backed off to 40 uA at the moment.

    FIGURE 1