光子辅助级联电子倍增器：势雪崩-离子阻断的概念
The Photon-Assisted Cascaded Electron Multiplier: a Concept for Potential Avalanche-Ion Blocking
摘要：
我们提出了一种光子辅助级联电子倍增器（PACEM），它具有潜在的气体辐射探测器中的离子回流阻塞：雪崩从第一个倍增阶段传播到连续的一个通过其光子，这反过来又诱导光电子发射从光电阴极沉积在第二倍增阶段，倍增过程可能会进一步继续通过电子雪崩传播。通过适当选择几何形状和场，光子介导级允许完全阻挡离子回流到第一元件中;因此，只有来自第一元件的离子将流回漂移区。PACEM概念在氙中操作的双MHSP（微孔和条形板）级联倍增器中得到验证，其中中间闪烁级提供约60的光学增益。双MHSP探测器的总增益超过10^4，对5.9 keV X射线的能量分辨率为18% FWHM。
英文摘要：
We present a Photon-Assisted Cascaded Electron Multipliers (PACEM) which has a potential for ion back-flow blocking in gaseous radiation detectors: the avalanche from a first multiplication stage propagates to the successive one via its photons, which in turn induce photoelectron emission from a photocathode deposited on the second multiplier stage; the multiplication process may further continue via electron-avalanche propagation. The photon-mediated stage allows, by a proper choice of geometry and fields, complete blocking of the ion back-flow into the first element; thus, only ions from the latter will flow back to the drift region. The PACEM concept was validated in a double-MHSP (Micro-Hole & Strip Plate) cascaded multiplier operated in xenon, where the intermediate scintillation stage provided optical gain of ~60. The double-MHSP detector had a total gain above 10^4 and energy resolution of 18% FWHM for 5.9 keV x-rays.
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