DAQ WS03 Sept 2006Jean-Sébastien GraulichSlide 1 DDAQ Trigger o Reminder: DAQ Trigger vs Particle Trigger o DAQ Trigger o Particle Trigger 1) Possible Conditions 2) Implementation of Condition Selection o Choice of hardware o Summary Jean-Sebastien Graulich, Geneva

DAQ WS03 Sept 2006Jean-Sébastien GraulichSlide 2 Reminder  Particle Trigger Triggers the digitization of the signals arriving at the Front End Electronics Should arrive a few ns around the signal (before in case of the SIS 3320) Distributed to all FEE boards  DAQ Trigger Triggers the readout of the Front End Electronics output buffer memory Should arrive at the end of the Spill, after the last event of the Spill We expect about 600 Particle triggers for 1 DAQ trigger Distributed to all VME crates

DAQ WS03 Sept 2006Jean-Sébastien GraulichSlide 3 DAQ Trigger  DATE requires dedicated input registers at least for 4 event Types: 1)Start of Spill: A signal sent to the DAQ slightly before the beginning of the Spill in order to make sure that all the processes are ready to receive data 2)Physics 3)End of Spill: A signal sent to the DAQ when the readout is finished which allow checking that all the processes have correctly performed the readout 4) Calibration  More inputs allows more options E.g. Calibration events can be pulser or pedestal or cosmics, etc. Dedicated input allows dedicated readout and/or event building and/or tagging with event attribute  We need a busy output for each input, plus a common busy

DAQ WS03 Sept 2006Jean-Sébastien GraulichSlide 4 Particle Trigger  4 Particle Trigger Conditions for Normal Events Burst: All ISIS bunch crossing with the target can produce a particle trigger, providing the FEE is not busy Beam: Burst x TOF0 Timing given by Burst Upstream: Beam x TOF1 Timing given by TOF1 Traversing: Upstream x TOF2 Timing given by TOF1 TOFn is defined by a twofold (Left x Right) coincidence of the OR of the 12 (8) slabs of a single layer  Trigger condition does NOT depend on Beam Momentum  Trigger Condition should be selected on the Run Control GUI before each Start of Run

DAQ WS03 Sept 2006Jean-Sébastien GraulichSlide 5 Particle Trigger  Simplest Implementation of the Trigger Condition selection OReg1 OReg2 OReg3 OReg4 Burst TOF0 TOF1 TOF2 Particle Trigger Request FEE Busy Particle Trigger  Setting OReg selects the trigger condition  Not extendable to more conditions !

DAQ WS03 Sept 2006Jean-Sébastien GraulichSlide 6 Hardware Choice  Need one module per VME crate (= 6 +1 spare) 16 Channels One OReg per IReg + 1 Common Ready to Order ! (1700 EUR/p) Decision needed !

DAQ WS03 Sept 2006Jean-Sébastien GraulichSlide 7 Summary  DAQ Trigger requires at least 4 channels of I/O register  Particle Trigger looks very simple: only 4 conditions  CAEN V977 is proposed as the DAQ trigger receiver and it has enough channels to be used also as an interface for Particle Trigger Selection