Trigger Architecture of the SuperNEMO Experiment

Abstract : SuperNEMO (SN) is the next-generation (0?ßß) experiment based on a tracking plus calorimetry technique. The construction of the demonstrator has started in 2012 and its installation is expected in 2015 in LSM underground laboratory (France). The SN experiment is designed to measure both energy and time of flight of each beta particle emitted from ßß decays. The demonstrator is made of a calorimeter (712 channels) and a tracking detector (6102 channels). These detectors front-end electronics use an unified architecture based on six similar crates that each host up to 20 Front-End Boards (FEB) and one SN_CROB board. Moreover a Trigger Board SN_TB is plugged in one of the remaining empty slot of a calorimeter crate. The FEBs perform the acquisition of the detector channels. The SN_CROB board gathers the front-end data from the calorimeter or tracker FEBs and sends them through Ethernet link to the data acquisition (DAQ) system. It extracts the Trigger Primitive (TP) from the front-end data and sends them through serial link to the Trigger Board (SN_TB). At each clock tick (25ns), we collect TP signals associated to each tracker and calorimeter channels. The trigger system is designed to merge all these TP signals and make a decision from these informations within a central programmable SN_TB. The trigger system has several relevant part: The calorimeter integrates 2 trigger thresholds: a major high energy threshold and a low energy threshold in order to detect low energy particles. The tracker provides the possibility of a second triggering for a delayed particle. The calorimeter or tracker part of the trigger system can operate separately. We have an overlap between the zoning of the calorimeter and the tracker. That means, the final trigger decision is made considering spatial coincidences between hits from the calorimeter and tracker detectors.
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http://hal.in2p3.fr/in2p3-01226214
Contributor : Sabine Starita <>
Submitted on : Monday, November 9, 2015 - 9:58:47 AM
Last modification on : Thursday, January 11, 2018 - 6:14:22 AM

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  • HAL Id : in2p3-01226214, version 1

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O. Duarte. Trigger Architecture of the SuperNEMO Experiment. 2015 IEEE Nuclear Science Symposium and Medical Imaging Conference - 22nd Symposium on Room-Temperature Semiconductor X-Ray and Gamma-Ray Detectors, Oct 2015, San Diego, CA, United States. ⟨in2p3-01226214⟩

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