Trigger electronics for the Alice PHOS detector

Radiation-Tolerant, SRAM-FPGA Based Trigger and Readout Electronics for the ALICE Experiment

“…The thresholds are based on the value of transverse momentum of the photon: high , mid and low . The TRU is presented in [6] and the firmware solution is discussed in depth in [7]. As the TRU is a part of the PHOS FEE it is located in the radiation environment.…”

PHOS, the ALICE-PHOton spectrometer

“…To meet the required large dynamical energy range, from 5 MeV to 80 GeV, each signal from the CSP is processed by two shapers with high and low gain and digitized by separate ADCs. Sixty four second-order (CRRC2) signal shapers are adopted on a ten-layer board with a gain ratio of ∼16 for two shaper sections digitized separately with 10 bit ADCs contained in four ALTRO-16 chips [11,12]. The energy range from 5 MeV to 5 GeV is taken from the high gain channels, while the energy range from 80 MeV to 80 GeV is taken from low gain channels.…”

Front-end electronics for PWO-based PHOS calorimeter of ALICE

“…These signals are transmitted via short cables to the Trigger Region Unit (TRU) (not shown). The TRU digitizes and processes [4] the analogue sum information of trigger domains of 448 crystals for generating PHOS level-0 and level-1 triggers. A processor-based USB port can be enabled via a switch to take over mastership over the PCM logic, allowing reprogramming of firmware and giving access to all data and control/status registers.…”