摘要
该多丝室读出系统是为费米实验室的高触发率固定靶实验Ｅ８７１设计的。系统为流水线结构，包括信号闩锁、去随机ＦＩＦＯ、编码器和缓冲器，死时间小于０．４７μｓ。该系统由多个机箱组成，每个机箱中有多个ＦＥＭ插件和它们的接口ＦＥＭＩ，每个ＦＥＭ接收并处理１２８路丝信号。为了减少读出时间，使用雏菊链电路以读出相对稀疏的数据。所有的操作都由硬件完成，一系列的事例同时在不同级电路中处理，不停地从多丝室读出系统中流过。该系统已经过全面测试，在２５９ｋＨｚ的触发率下，接收和处理了十亿个伪事例未发现错误。
A MWPC readout system is designed for a high trigger rate fixed target experiment E871 in Fermilib in US. The system is pipeline structured which includes signal latch, derandomize FIFO, encoder and buffers, and has the dead time less then 0.47 μs. The system is composed of two daisy chained crates in which there are multiple FEM modules and their interface FEMI. 128 channels of the wire signals are received and processed by each FEM. For reducing the readout time, the daisy chain circuit is used readout the relatively sparce data. The operations are accomplished by the hardware. A series of events are processed in different stages at the same time and is continuously passed through the MWPC readout system. The system has been fully tested. 10 9 fake events were received and processed without fault at 250 kHz trigger rate.
出处
《核电子学与探测技术》
CAS
CSCD
北大核心
1998年第4期251-256,共6页
Nuclear Electronics & Detection Technology
