Live- and Dead-time in Gleam

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Live- and Dead-time in Gleam

• Toby Burnett

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Current Implementation

• One Job options parameter TriggerAlg.deadtime
• Note constant for now, but could depend on event
  complexity
• Local variables in TriggerAlg
• time of last accepted trigger
• accumulated live time
• number of events rejected
• If the time of an event less last trigger is lt
  deadtime
• Throw it away
• Increment count of rejected events
• Otherwise
• Reset last trigger time
• Add time from last trigger, less deadtime to
  livetime, recorded as a tuple variable LiveTime
  (will propose to add to Evt, as EvtLiveTime)
• At the end of a run
• Print out number of rejected events

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Plot example

• Set TriggerAlg.deadtime to 0.1 s (like EGRET),
  require pass dead time trigger condition

Shows the accumulated deadtime (EvtElapsedTime-Li
veTime) increasing with event id. Total is 83 s
corresponding to 829 triggers.