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中性束注入装置(Neutral Beam Injector,NBI)是产生高能中性粒子束用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。本文研究分析了HT-7托卡马克NBI实验装置的工作原理和结构特点,利用Monte-Carlo方法建立NBI实验装置主真空室及飘移管道内分子运动及碰撞的相关模型,并进行编程实现对NBI实验装置真空压力分布模拟计算。模拟计算和实验结果表明:主真空室低温冷凝泵抽速为4×105L/s时,主真空室压力在脉冲充气过程中维持在10-3Pa量级;飘移管道低温冷凝泵抽速为4×104L/s时,飘移管道压力维持在10-4Pa量级。文章的结论为中性束传输过程中再电离损失的研究提供了理论依据。
Neutral Beam Injector (NBI) is a device that generates a beam of high-energy neutral particles to heat a Tokamak plasma. NBI vacuum pressure distribution is one of the key factors affecting the efficiency of neutral beam transmission, especially reionization loss. In this paper, the working principle and structural characteristics of the HT-7 tokamak NBI experimental apparatus are analyzed. The Monte-Carlo method is used to establish the related models of molecular motion and collision in the main vacuum chamber and the drift pipe of the NBI experimental apparatus. Experimental Calculation of Vacuum Pressure Distribution in a Laboratory. The simulation results and the experimental results show that the pressure in the main vacuum chamber is maintained at 10-3Pa during pulsed inflation when the pumping speed of the main vacuum chamber cryogenic condensate pump is 4 × 105L / s. The pumping speed of the drifting pipeline cryogenic condensate pump is 4 × At 104 L / s, the drift line pressure is maintained on the order of 10 -4 Pa. The conclusion of the article provides a theoretical basis for the study of reionization loss in the process of neutral beam transmission.