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EAST-NBI真空空间粒子分布状态是影响中性束再电离损失的重要因素,是研究EAST-NBI系统的结构设计和提高加热效率的重要课题。根据EAST-NBI的工作原理、结构特点以及系统的气源特性,利用Monte-Carlo方法建立模型,运用Matlab软件对EAST-NBI稳态运行模式下真空空间内任意时刻的粒子分布进行编程模拟计算。研究结果表明气源的种类、气体量大小和气体粒子的发射方向是影响EAST-NBI真空空间粒子分布的主要因素,为减小再电离损失、提高加热效率和EAST-NBI的研制提供理论依据。
EAST-NBI vacuum space particle distribution is an important factor that affects the re-ionization loss of neutral beam and is an important issue to study the structural design of EAST-NBI system and improve the heating efficiency. According to the working principle, structural characteristics and gas source characteristics of EAST-NBI, Monte-Carlo method was used to establish the model and Matlab software was used to simulate the particle distribution of EAST-NBI steady state at any time in vacuum space. The results show that the type of gas source, the amount of gas and the emission direction of gas particles are the main factors influencing the particle distribution in EAST-NBI vacuum space, which provides the theoretical basis for the reduction of re-ionization loss, improvement of heating efficiency and development of EAST-NBI.