多击响应的三层阳极丝位置灵敏探测器及其信号重整

最新发展起来的三层延迟线阳极, 即Hexanode与标准的螺旋状延迟线(HDL)阳极相比, 对多击事件有较好的响应能力. 它与一对微通道板组合在一起构成的位置灵敏探测器能够响应同时或短时间间隔内到达探测器的多个粒子, 并给出粒子的全部动量信息. 针对Hexanode在响应多个同时或短时间间隔内到达的粒子时出现的信号丢失问题, 自行编写了一个信号重整程序. 经过此程序的处理后, 多击响应位置灵敏探测器的死时间只存在于两个粒子同时到达探测器的同一位置时(在一定时间及位置范围内). 在最近完成的使用Hexanode探测器的近阈值e+He→3e+He⁺⁺中, 获得了很好的结果.

Restoration of the Signals from Multi-hit Three-Layer Delay-Line Anode Position-Sensitive Detector

Multi-hit 3-layer delay-line anode (Hexanode) has an increased ability to detect multi-hit events in a collision experiment. Coupled with a pair of micro-channel plates, it can provide position information of the particles even if the particles arrive at the same time or within small time dwell. But it suffers from some ambiguous outputs and signal losses due to timing order and triggering thresholds etc. We have developed a signal reconstruction program to correct those events. After the program correction, the dead time only exists when 2 particles arrive at the same time and the same position within a much smaller range. With the combination of Hexanode and the program, the experimental efficiencies will be greatly improved in near threshold double ionization on He collisions.