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中性束注入装置是产生高能中性粒子以加热托卡马克等离子体的装置。NBI真空压力分布是影响中性束传输效率特别是再电离损失的关键因素之一。研究分析了超导托卡马克实验装置中NBI的工作原理和结构特点,建立了EAST NBI的几何与物理模型,利用Monte-Carlo方法建立NBI主真空室内分子运动及碰撞的数学模型,并运用Matlab软件编程实现对NBI主真空室内真空压力分布的模拟计算,得到主真空室内三段区域在进气过程中的气体分子三维分布图和平均压力变化曲线。研究可为EAST NBI主真空室内的中性化室、偏转系统、低温抽气系统的结构设计提供指导。
Neutral beam injection devices are devices that generate energetic neutrals to heat tokamak plasma. NBI vacuum pressure distribution is one of the key factors affecting the efficiency of neutral beam transmission, especially reionization loss. The working principle and structural characteristics of NBI in superconducting tokamak experimental apparatus were studied. The geometric and physical model of EAST NBI was established. The mathematical model of molecular motion and collision in the main chamber of NBI was established by Monte-Carlo method. Software programming realizes the simulation calculation of the vacuum pressure distribution in the main vacuum chamber of NBI, and obtains the gas molecule three-dimensional distribution chart and average pressure curve during the intake process in the three sections of the main vacuum chamber. The research can provide guidance for the structural design of neutral chamber, deflection system and low-temperature exhaust system of EAST NBI main vacuum chamber.