Tile Calorimeter Phase I

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Mechanical Details
PMT Block
Motherboard for LV & Control Signals
HV Control & Distribution in the Drawer
Digitizer System
Readout Driver
Level 1 Trigger
Interface Board
External LV Supplies
Notes and Writeups
Software for 13bit Version of 3in1 Cards
Radiation Testing
Design Review
Production Readiness Review
Submodule Construction
Commissioning
Trigger Signals
Other Sites with TileCal Info

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 E_T sums.

Trigger tower output signals

• unipolar, 50 ns FWHM
• calibration, ± 4 mV/GeV
• differential, ± 2 V full scale (500 GeV)
• outputs are capable of driving 50 ohm loads with respect to ground
• noise < ± 1 mV RMS
• fast overload recovery

Input signals to trigger tower adders

• unipolar, 50 ns FWHM
• shaped pulses derived from PMT signals
• coincident in time to ± 1.5 ns
• calibration, ± 0.5 mV/GeV
• differential, ± 0.5 V full scale (1000 GeV)
• enable/disable for each signal via 3-in-1 control