FPGA-based trigger system for the Fermilab SeaQuest experimentz

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• 作者：Shiuan-Hal Shiu^a ; ^b ; ^{shshiu@phys.sinica.edu.tw" class="auth_mail" title="E-mail the corresponding author} ; Jinyuan Wu^c ; Randall Evan McClellan^d ; Ting-Hua Chang^a ; Wen-Chen Chang^a ; Yen-Chu Chen^a ; Ron Gilman^e ; Kenichi Nakano^f ; Jen-Chieh Peng^d ; Su-Yin Wang^a ; ^c ; ^g
• 关键词：Trigger ; FPGA firmware ; TDC ; Muon pairs
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2015
• 出版时间：1 December 2015
• 年：2015
• 卷：802
• 期：Complete
• 页码：82-88
• 全文大小：2698 K

文摘

The SeaQuest experiment (Fermilab E906) detects pairs of energetic 渭⁺ and 渭⁻ produced in 120 GeV/c proton–nucleon interactions in a high rate environment. The trigger system consists of several arrays of scintillator hodoscopes and a set of field-programmable gate array (FPGA) based VMEbus modules. Signals from up to 96 channels of hodoscope are digitized by each FPGA with a 1-ns resolution using the time-to-digital convertor (TDC) firmware. The delay of the TDC output can be adjusted channel-by-channel in 1-ns step and then re-aligned with the beam RF clock. The hit pattern on the hodoscope planes is then examined against pre-determined trigger matrices to identify candidate muon tracks. Information on the candidate tracks is sent to the 2nd-level FPGA-based track correlator to find candidate di-muon events. The design and implementation of the FPGA-based trigger system for SeaQuest experiment are presented.