Abstract
The ALICE Silicon Pixel Detector contains 1200 readout chips.Fast-OR signals indicate the presence of at least one hit in the8192 pixel matrix of each chip. The 1200 bits are transmitted every100 ns on 120 data readout optical links using the G-Link protocol.The Pixel Trigger System extracts and processes them to deliver aninput signal to the Level 0 trigger processor targeting a latency of800 ns. The system is compact, modular and based on FPGA devices. The architecture allows the user to define and implement various triggeralgorithms.The system uses advanced 12-channel parallel optical fiber modulesoperating at 1310 nm as optical receivers and 12 deserializer chipsclosely packed in small area receiver boards.Alternative solutions with multi-channel G-Link deserializers implementeddirectly in programmable hardware devices were investigated.The design of the system and the progress of the ALICE Pixel Triggerproject are described in this paper.
Highlights
ALICE is an experiment designed to study the physics of strongly interacting matter and the properties of quark gluon plasma in the collisions between heavy ions nuclei at the Large Hadron Collider (LHC) at CERN [1]
The 10 Fast-OR bits of each half stave are continuously transmitted by the Multi Chip Module (MCM) every 100 ns on the output optical link
The Fast-OR signals allow the Silicon Pixel Detector (SPD) to be operated as a low latency and low granularity pad detector, with an equivalent pad size of ∼13×13 mm2
Summary
ALICE is an experiment designed to study the physics of strongly interacting matter and the properties of quark gluon plasma in the collisions between heavy ions nuclei at the Large Hadron Collider (LHC) at CERN [1]. The 1200 readout chips of the SPD feature a Fast-OR output signal. This digital output is active whenever at least one of the 8192 channels of the chip records a hit. The 10 Fast-OR bits of each half stave are continuously transmitted by the MCM every 100 ns on the output optical link They are transmitted using the user field of the G-Link control words. The linear array of 10 pixel chips in each half stave is Trigger Processor (CTP). Read out via a Multi Chip Module (MCM) [3] This includes the The Pixel Trigger System for the ALICE experiment is re-.
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