PS trigger

The purpose of the pair spectrometer trigger is to provide a gate well-timed with the pair spectrometer ADC signals. This will be used to monitor the gains of the paddles. In particular, to monitor the gain's dependance on the rate. The Pair Spectrometer trigger will come from a 4-fold coincidence of the upstream-left/right, downstream-left/right pair spectrometer paddle groups. This trigger has been used successfully in CLAS data taking.

As a special purpose monitoring trigger, the rate of PS triggered events will contribute a small fraction of the total event rate. We plan to prescale the PS trigger so that it's rate does not exceed 0.5% of the total trigger rate.