Zero-Suppression Trigger Mode for GEM detector measurement system
Abstract
A novel approach to a trigger mode in the GasElectron Multiplier (GEM) detector readout system is presented.
The system is already installed at WEST tokamak. The article
briefly describes the architecture of the GEM detector and the
measurement system. Currently the system can work in two
trigger modes: Global Trigger and Local Trigger. All trigger processing
blocks are parts of the Charge Signal Sequencer module
which is responsible for transferring data to the PC. Therefore,
the article presents structure of the Sequencer with details about
basic blocks, theirs functionality and output data configuration.
The Sequencer with the trigger algorithms is implemented in
an FPGA chip from Xilinx. Global Trigger, which is a default
mode for the system, is not efficient and has limitations due to
storing much data without any information. Local trigger which
is under tests, removes data redundancy and is constructed to
send only valid data, but the rest of the software, especially on the
PC side, is still under development. Therefore authors propose
the trigger mode which combines functionality of two existing
modes. The proposed trigger, called Zero Suppression Trigger, is
compatible with the existing interfaces of the PC software, but
is also capable to verify and filter incoming signals and transfer
only recognized events. The results of the implementation and
simulation are presented.
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