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Double trigger fix

Daniel Spitzbart requested to merge double_trigger_fix into master

Software based fix for an issue observed in the FNAL setup:

  • The KCU board receives trigger pulses from the scope that are 500-600ns long, with an amplitude of 350-400mV
  • It seems like a single trigger pulse can be interpreted as 2 (e.g. if there are some oscillations at the end of the pulse)
  • In this case the difference of BCID between two consecutive events is around 20-25 (20*25ns = 500ns)
  • Consecutive events with such small difference in BCID should not happen for trigger rates below 1MHz, so it should be save to discard the second event in such an event pair

Fix has been tested for FNAL runs 10262 and 10671.

Edited by Daniel Spitzbart

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