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    User name Norum

    Log entry time 20:01:50 on April30,2008

    Entry number 236005

    keyword=Stop data taking; beam retune

    19:00 Run L4440 started; production on H2; I=3.4 uA
    19:06 BB HV S14 & S0 trip
    19:12 Run L4441 started; production on H2; I=3.4 uA
    19:18 BB HV S6 & S4 trip; then S14
    19:22 Run L4442 started; production on H2; I=3.4 uA
    19:24 BB HV S14 & S1 trip
    19:30 Run L4443 and R20813 startED
    19:32 S1-S7 & S14 all tripped; correlated with beam spike and failure
    19:35 S14 tripped again during power up; same time as beam spike/trip
    19:39 Run L4444 started
    19:43 S5,S6, S14 trip when beam spiked/failed
    19:47 Run L4445 started
    19:52 S2,S3, S14 trip when beam spiked/failed. MCC crew chief said trips
    are due to cavities dropping out. Before dropping out they go unstable
    and spray the beam around, hitting the beam pipe ...
    MCC will attempt to retune upstream in hopes of a more stable orbit
    downstream in event of failure