TileCal Trigger Signals

The TileCal LVL1 trigger signals are produced by analog adders located in the electronics drawers. The inputs to the adders are shaped analog signals from the the 3-in-1 cards associated with each PMT. The signal amplitudes are proportional to the charge from the PMT and the timing is set with fixed delay cables to obtain a coincidence of all signals in the tower.

The output timing from each tower varies because of time-of-flight effects and the location of the adder circuit. The signals represent energy sums not ET sums.

Trigger tower output signals

Input signals to trigger tower adders

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