多丝正比室阴极电荷取样法K介子电产生中的粒子跟踪
Particle tracking in kaon electroproduction with cathode-charge sampling in multi-wire proportional chambers
摘要：
在高强度连续电子束的磁谱仪中，线室通常用作跟踪探测器。特别是在研究具有小横截面的反应的实验中，反应产率受到腔室中的背景速率的限制。确定带电粒子通过多丝正比室（MWPC）的轨迹的一种方法是测量其阴极上感应的电荷分布。在这种读出方法的实际应用中，将所测量的电荷分布与雪崩位置相关联的算法对于可实现的位置分辨率和磁道重建效率是重要因素。提出了一种在强背景多粒子环境中操作两台大尺寸多粒子探测器的算法。所得到的效率被确定为电子束电流和信号幅度的函数。由于π介子、K介子和质子在谱仪动量范围内的能量损失不同，因此效率也取决于粒子种类。
英文摘要：
Wire chambers are routinely operated as tracking detectors in magnetic spectrometers at high-intensity continuous electron beams. Especially in experiments studying reactions with small cross-sections the reaction yield is limited by the background rate in the chambers. One way to determine the track of a charged particle through a multi-wire proportional chamber (MWPC) is the measurement of the charge distribution induced on its cathodes. In practical applications of this read-out method, the algorithm to relate the measured charge distribution to the avalanche position is an important factor for the achievable position resolution and for the track reconstruction efficiency. An algorithm was developed for operating two large-sized MWPCs in a strong background environment with multiple-particle tracks. Resulting efficiencies were determined as a function of the electron beam current and on the signal amplitudes. Because of the different energy-losses of pions, kaons, and protons in the momentum range of the spectrometer the efficiencies depend also on the particle species.
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