Computational investigation of transport parameters of ions in gas-filled radiation detectors

Yalçın Kalkan, Sedat Arı, Salim Orak, Rob Veenhof
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Abstract

In this study, a novel computational method was developed to investigate the transport characteristics of ions in gas-filled radiation detectors, which are closely linked to the behavior of ions in gaseous detectors. Parameters such as polarizability, mean free path, collision frequency, and mean free time, which directly impact ion mobility, were physically manipulated using the Monte Carlo technique, and the results were validated against fundamental physical principles. As an initial scenario, computations were performed on the mobility of Ar+ ions in an argon environment as a carrier gas. The distribution of the radial velocity components of the ion following an ion-gas collision was represented as a two-dimensional histogram with a disc-shaped pattern, and this result was elucidated utilizing the Maxwell-Boltzmann distribution. The findings regarding the mean free time and mean free path of an Ar+ ion in an argon carrier gas align with the results derived from Skullerud's methodologies. These findings hold promise for Garfield++  simulations, enabling the computation of ion mobility and even cluster ions in the mixture, thereby considering their impact on the detector's gain parameters. The results of this investigation offer novel insights into the behavior of ions within detector settings, significantly enhancing our comprehension of the mobility of ions and its effects on radiation detection efficiency.
充气辐射探测器中离子传输参数的计算研究
本研究开发了一种新型计算方法,用于研究充气辐射探测器中离子的传输特性,该特性与气态探测器中离子的行为密切相关。使用蒙特卡洛技术对极化率、平均自由路径、碰撞频率和平均自由时间等直接影响离子迁移率的参数进行了物理处理,并根据基本物理原理对结果进行了验证。作为初始方案,对 Ar+ 离子在氩气环境作为载气时的迁移率进行了计算。离子与气体碰撞后离子径向速度分量的分布被表示为一个具有圆盘形图案的二维直方图,并利用麦克斯韦-玻尔兹曼分布对这一结果进行了阐释。关于 Ar+ 离子在氩载气中的平均自由时间和平均自由路径的研究结果与 Skullerud 方法得出的结果一致。这些发现为 Garfield++ 模拟带来了希望,使计算离子迁移率甚至混合物中的离子群成为可能,从而考虑它们对探测器增益参数的影响。这项研究的结果为了解探测器中离子的行为提供了新的视角,极大地提高了我们对离子迁移率及其对辐射探测效率影响的理解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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