论文标题
在30-900 EV能量范围内电子的两阶段微通道板的绝对效率
Absolute efficiency of a two-stage microchannel plate for electrons in the 30 - 900 eV energy range
论文作者
论文摘要
我们报告了能够测量30-900 eV范围内电子检测器的绝对检测效率。特别是，我们讨论了两阶段人字形微通道板（MCP）的表征。这些测量已在惠特的罗马TRE大学的LASEC实验室中进行，定制电子枪。梁电流在FA范围内的良好稳定性以及Picamammeter标称分辨率为0.01 FA，允许测量MCP绝对效率$ε$。我们发现$ε$ =（0.489 $ \ pm $ 0.003），没有明显的能量依赖。我们充分表征了MCP脉冲形状分布，该分布是准高斯的，其噪声水平高于噪声水平。我们测量了平均脉冲高度在30至500 eV之间的68％变化。此外，通过对脉冲形状进行更深入的分析，尤其是脉冲高度，面积和宽度之间的相关性，我们找到了一种区分10 ns时间窗口中发生的单和多电子事件的方法。
We report on an apparatus able to measure the absolute detection efficiency of a detector for electrons in the 30 - 900 eV range. In particular, we discuss the characterisation of a two-stage chevron microchannel plate (MCP). The measurements have been performed in the LASEC laboratory at Roma Tre University, whit a custom-made electron gun. The very good stability of the beam current in the fA range, together with the picoammeter nominal resolution of 0.01 fA, allowed the measurement of the MCP absolute efficiency $ε$. We found an $ε$ = (0.489 $\pm$ 0.003) with no evident energy dependence. We fully characterised the MCP pulse shape distribution, which is quasi-Gaussian with a well visible peak above the noise level. We measured a 68% variation of the average pulse height between 30 and 500 eV. Furthermore, with a deeper analysis of the pulse shape, and in particular of the correlation between pulse height, area and width, we found a method to discriminate single- and multi- electron events occurring within a 10 ns time window.
