A study of a continuously readable time-projection chamber

我们研制了一套用于时间投影室的读出系统。该系统采用带存储器的CPU板构成。将来自时间投影室（TPC）的数字化信号传送到环形缓冲存储器中，由多个CPU对信号进行分析，一个CPU分析一个信号序列，另一个CPU分析另一个信号序列。如果是所需事件，则向另一CPU传送记录请求。我们测试了两种具有VME总线的CPU。一种是通用32位CPU，另一种是为并行处理而设计的CPU。前者用于快速数据传输，后者用于CPU与CPU之间的通信。该系统不仅可用于TPC，而且可用于任何需要连续测量的探测器系统，如宇宙线实验。

We have developed a read-out system for time-projection chamber. The system have been made by using CPU boards with memory. The digitized signals from time-projection chamber (TPC) is transfered to the ring-buffer memory and the signals are analyzed by multiple CPU.One CPU analyze a sequence of signals and another CPU analyze another sequence. If it is a desired event, a recording request is transferred to the other CPU. Thus, this system can be read signals continuously.We have tested two types of CPU with VME-bus. One is general purpose 32-bit CPU and another one is the CPU designed for parallel processing. The former is used for fast data transfer and the latter is used for CPU-CPU comunication. This system can be used not only TPC but also any detector system which requires continuous mesurement like cosmic-ray experiments.