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conclusion: feels like we should stick with original proposal

Normalization for Integrating Detectors

We typically accumulate shot-by-shot measurements of intensity from BLD, for instance, to use as normalization for the exposure of the integrating detectors.  Deadtime will sometimes result in the loss of some of the events that contribute to the integrated normalization.  How do we estimate this loss?  The XPM measures deadtime, but it is not added to the science data in any way.  One possibility is to capture the total deadtime (lost events/total events) at EndRun or EndStep.  Another possibility is to capture that number for a given trigger.  That could involve adding the deadtime numbers into the timing segment level, for instance, by modifying the XPM to broadcast those numbers on the timing stream.