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User name D. Parno
Log entry time 14:54:50 on August25,2009
Entry number 285896
keyword=Compton: FADC Accumulator Sum Rule
The accumulators of the FADC-based Compton photon detector should satisfy a sum rule. Accumulator 0 (integrating everything) should have the same number of samples contributing to it as Accumulator 1 (near pedestal), Accumulator 2 (window), and Accumulator 3 (large pulses) combined.
As the figure shows, for a test run we took today with no beam, the two sides of this sum rule differ by only two parts in 6.6 million. This is the same deviation from the sum rule that was observed initially in December 2007.