Private:Trigger Types

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The main installation and trigger activities can be organized into the three main phases:

1. Initial installation phase, where only a few crates with electronics are installed and connected to the sub-detector.
  • Run stand alone DAC for each sub-detector. Start calibration of fadc pedestals, implementing calibration triggers and start tuning trigger parameters
4 TI boards were populated with 4 additional transceivers and can be used as master-TIs handling the clock and trigger distribution for up to 6 crates
One extra transceiver was added to 4 TI boards. They can be used as a master-TI for small sub-systems (like the microscope, SC, PS)
2. Final Detector installation
  • Use the global trigger distribution (the global trigger and the trigger distribution crates)
Up to 4 sub-systems can run in parallel sharing the TS (TS partitioning).
Calibrate DAQ (readout windows, pedestals, thresholds, etc.) and trigger parameters (offsets, threshold, etc.)
3. Detector Calibration with the Beam


Phase I (Initial Installation)


BCAL

Can run up to 6 crates with the master TI

  • External pulser
Calibrate pedestals
External trigger for the master TI
  • Cosmics
Generated by CTP in each crate. Possibility to generate the trigger for each BCAL module.
ID of the 'fired' module is sent to the SSP along with the energy sum.
The trigger is sent from the SSP front pannel to the master TI.
Algorithm is being implemented into the CTP.
  • LED Pulser
Initiated by 2 CAEN 1495 board (24 TTL outputs)
LED pattern programmed through EPICS
LVDS output is used as an external trigger for the master TI


FCAL

Can run up to 6 crates with the master TI

  • Cosmics
Energy summed in the crates (CTP). Energy threshold set at SSP.
The trigger is sent from the SSP front pannel to the master TI.
  • Pulser
The same as for the BCAL