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    User name J. Singh

    Log entry time 05:26:05 on July27,2003

    Entry number 107286

    keyword=Hall C current & Hall A position

    @ about 0502, hall C beam was turned off. our beam position at about the same time moved way off nominal center. a few minutes later, we called MCC and had it recentered. @ about 0512, hall C beam was restored. once again our beam position moved away. a few minutes later, we asked MCC to recenter it.

    feedback is off, but MCC does seem to do a good job keeping it centered manually. it appears that our beam position is correlated to hall C's beam on/off condition.

    note that the time scales (horizontal axes) are different for the two plots.


    FIGURE 1

    FIGURE 2