Application of position sensitive detector for the electron detachment cross-sections measurement
Application of position sensitive detector for the electron detachment cross-sections measurement
复制标题
DOI：
10.1016/j.nima.2009.11.062
复制
发表时间：
2010-02
影响因子：
1.4
通讯作者：
Jun Zhao;X. Bai;Junqin Li;Xuemei Zhang;B. Wei;Y. Zou
中科院分区：
文献类型：
--
作者：
Jun Zhao;X. Bai;Junqin Li;Xuemei Zhang;B. Wei;Y. Zou
本文报道了我们改进的基于微通道板(MCP)位置灵敏探测器的检测系统，它可以简化我们测量负离子-气体碰撞中电子脱离截面的实验过程。对MCP的工作参数进行了深入的研究，给出了阳极信号的脉冲高度分布(PHD)与MCP偏置电压、入射束流能量、入射束流强度和入射离子种类的关系。确定了MCP的偏置电压、电子阈值和入射离子强度等最佳参数。给出了MCP的饱和曲线。最后，我们给出了利用新的位置灵敏探测系统得到的H-−和C-−与N_2碰撞的单电子剥离截面。与其他已有实验结果的一致性表明了新检测系统的可靠性。
In this paper, we report our improved detection system based on a micro-channel plate (MCP) position sensitive detector, which could simplify our experiment process of the electron detachment cross-sections measurement in negative ion–gas collisions. The operating parameters of MCP are investigated thoroughly, and we present the dependence of the pulse height distributions (PHD) of the anode signals on MCP bias voltage, incident beam energy, incident beam intensity, and incident ion species. The optimum parameters, such as bias voltage of the MCP, the threshold of the electronics and incident ions intensity, are determined. The saturation curve of MCP is also shown. Finally, we give the single electron detachment cross-sections of H−and C−in collision with N2obtained using the new position sensitive detection system. Consistency with other available experiment results shows the reliability of the new detection system.