基于FPGA的费米实验室SeaQuest触发系统
FPGA-based trigger system for the Fermilab SeaQuest experiment
摘要：
SeaQuest实验（Fermilab E906）探测了在高速率环境中120 GeV/c质子-核子相互作用中产生的高能μ+和μ-对。触发系统由多个闪烁体阵列和一组基于现场可编程门阵列（FPGA）的VME总线模块组成。每个FPGA使用时间-数字转换器（TDC）固件以1 ns分辨率对来自最多96个描迹器通道的信号进行数字化。TDC输出的延迟可以以1 ns的步长逐通道调整，然后与射束RF时钟重新对齐。然后，针对预定的触发矩阵来检查描迹仪平面上的命中图案，以识别候选μ子轨道。候选径迹的信息被发送到第二级基于FPGA的径迹相关器，以找到候选的双μ子事件。介绍了基于FPGA的SeaQuest实验触发系统的设计与实现。
英文摘要：
The SeaQuest experiment (Fermilab E906) detects pairs of energetic μ+ and μ- 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 steps 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.
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