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为了辅助设计下一代受控核聚变装置所要求的高能、大功率中性束注入器,我们根据负离子-中性束注入系统的特点,建立了数值模拟负离子束系统的物理模型和计算程序,并进行了数值模拟研究。与数值模拟正离子束系统的物理模型相比,该物理模型包含了更多的物理过程,如需要利用磁场来偏转与负离子一起引出的电子,以提高系统效率;为此就必须考虑等离子体电子横越磁场的扩散并包含由离了源等离子体引出的负离子和电子在电磁场共同作用下的运动行为以及相关等离子体参数对粒子初始发射的影响;也包含了束内部空间电荷非线性力和负离子在输运过程中的剥离损失等物理现象。在进行的数值模拟研究中,对系统的几何尺寸及电磁
In order to assist the design of the high energy, high power neutral beam injector required by the next generation of controlled fusion devices, based on the characteristics of the negative ion - neutral beam injection system, the physical model and calculation program of the numerical simulation negative ion beam system are established. Conducted numerical simulation. Compared with the physical model of a simulated positive ion beam system, the physical model involves more physical processes, such as the need to use a magnetic field to deflect the electrons emanating from the negative ions to improve the system efficiency; for this reason, the plasma electron Crossing the diffusion of the magnetic field and encompassing the influence of the movement of negative ions and electrons emanating from the source plasma on the initial emission of the particles by the interaction of the electromagnetic field and the plasma parameters; Also included is the beam internal space charge nonlinear force and negative ions in Peeling loss during transport and other physical phenomena. In the study of numerical simulation, the system geometry and electromagnetic