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    User name M.Olson

    Log entry time 01:37:17 on June 4,2007

    Entry number 204188

    keyword=Note on prescales

    We have set prescale factors IAW the run plan using rates for a 50uA nominal beam current. Depending on the needs of Hall C, our current is varying between 50 and 60uA. At 60uA, this raises the scaled rates above the specified values for T1 (10Hz), T2 (5Hz), and T4(5Hz) as specified in the run plan. The dead time at 60uA is 10-11% with PS3=1, and about 8% at 50uA.

    Since we typically do not stay at 60uA for too long a period, and the current changes come without advance warning, I plan to just run using the prescales for 50uA and not attempt to follow the short-term changes in the current.