High-resolution detection system for time-of-flight electron spectrometry
High-resolution detection system for time-of-flight electron spectrometry
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DOI：
10.1016/j.nima.2007.08.101
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发表时间：
2007-11-11
影响因子：
1.4
通讯作者：
Hussain, Z.
中科院分区：
文献类型：
--
作者：
Tremsin, A. S.;Lebedev, G. V.;Hussain, Z.
飞行时间（TOF）光谱仪的关键部件之一是检测系统。除了高时间分辨率外，精确的二维成像大大拓宽了TOF光谱仪的应用领域，例如，为角分辨光电子能谱（ARPES）增加了一个新的维度。本文报道了一种高空间（< 50 am）和时间（< 130 ps）分辨率的成像系统的最新进展，该系统能够选择性地探测电子、离子和/或光子。相对于我们以前报道的结果，我们已经大大提高了系统的计数率的能力，特别是对于感兴趣的能量范围代表了一小部分的检测器平面处的入射通量的情况下。新系统忽略可调时间窗口之外的所有事件，大大减少了事件处理所需的死区时间。这允许在给定的能量或动量范围内进行高分辨率TOF测量，并且还可以用于区分（或禁用）光子检测与带电粒子检测。在给定的能量窗口内，在10%的死时间下，计数率可高达400 KHz。本文报道的电子探测系统是为劳伦斯伯克利国家实验室先进光源的TOF ARPES实验而研制的。(C)2007 Elsevier B. V.保留所有权利。
One of the key components of a time-of-flight (TOF) spectrometer is the detection system. In addition to high timing resolution, accurate two-dimensional imaging substantially broadens the areas of applications of TOF spectrometers; for example, add a new dimension to angle-resolved photoemission spectroscopy (ARPES).In this paper we report on the recent developments of a high spatial (< 50 am) and timing (< 130 ps) resolution imaging system capable of selective detection of electrons, ions and/or photons. Relative to our previously reported results, we have substantially improved the counting rate capabilities of the system especially for cases where the energy range of interest represents a small fraction of the incoming flux at the detector plane. The new system ignores all the events outside of a tunable time window substantially decreasing the dead time required for the event processing. That allows high-resolution TOF measurements within a given energy or momentum range and also can be used for distinguishing (or disabling) detection of photons versus detection of charged particles. The counting rate within a given energy window can be as high as similar to 400 KHz at 10% dead time.The electron detection system reported in the paper was developed for the TOF ARPES experiments at the Advanced Light Source, Lawrence Berkeley National Laboratory. (C) 2007 Elsevier B.V. All rights reserved.