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.