充电、空间电荷积累与放电形成的数值模拟
Numerical simulation of charging up, accumulation of space charge and formation of discharges
AI总结：
针对气体电离探测器中带电粒子动力学过程模拟成本高的问题，提出两种数值模拟方法并对比，同时分析模拟参数的影响。
摘要：
气体电离探测器的老化与稳定性和充电、空间电荷积累及放电形成密切相关，而所有这些现象又取决于器件内部带电粒子的动力学行为。由于涉及的粒子数量庞大且相互作用复杂，带电粒子的产生、损失及其在探测器体积内输运的动态过程进行数值模拟的计算成本极高。本研究提出并评估了有望解决上述问题的多种算法与方法。研究针对几种具有平行板结构的重要电离探测器展开，包括GEM（气体电子倍增器）、Micromegas（微结构气体探测器）、RPCs（阻性板室）和THGEMs（厚型气体电子倍增器）。初级电离相关信息由HEED程序获取，所有输运特性则通过MAGBOLTZ程序计算。研究采用两种不同方法追踪输运动力学过程：第一种是结合neBEM（近场边界元法）求解器与Garfield++框架的粒子描述方法，为此对neBEM求解器进行了显著改进，使其在估算电场时能考虑器件内部带电粒子引起的扰动；第二种是利用COMSOL软件基于流体动力学模型模拟输运过程，该过程中的电场也由COMSOL提供，便于设置空间电荷效应。本文将对这些可行方法进行对比，并通过简单示例展示不同模拟参数的影响。
英文摘要：
Aging and stability of gaseous ionization detectors are intricately related to charging up, accumulation of space charge and formation of discharges. All these phenomena, in their turn, depend on the dynamics of charged particles within the device. Because of the large number of particles involved and their complex interactions, the dynamic processes of generation and loss of charged particles, and their transport within the detector volume are extremely expensive to simulate numerically. In this work, we propose and evaluate possible algorithms / approaches that show some promise in relation to the above-mentioned problems. Several important ionization detectors having parallel plate configurations, such as GEM, Micromegas, RPCs and THGEMs, are considered for this purpose. Information related to primary ionization is obtained from HEED, while all the transport properties are evaluated using MAGBOLTZ. The transport dynamics have been followed using two different approaches. In one, particle description using neBEM-Garfield++ combination has been used. For this purpose, the neBEM solver has been significantly improved such that perturbations due to the charged particles present within the device are considered while estimating electric field. In the other approach, the transport is simulated following hydrodynamic model using COMSOL during which the electric field is also provided by COMSOL where it is easy to set up space charge effects. A comparison between these possible approaches will be presented. Effect of different simulation parameters will also be demonstrated using simple examples.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
