Simulations of first-orbit losses of neutral beam injection (NBI) fast ions in the EAST tokamak have been studied in detail by using the orbit-following code GYCAVA and the NBI code TGCO. Beam ion losses with the wall boundary are smaller than those with the last closed flux surface boundary. In contrast to heat loads on the wall without radio frequency wave (RFW) antennas, heat loads on the wall with RFW antennas are distributed more locally near the RFW antennas. The direction of the toroidal magnetic field dramatically affects the final positions of lost fast ions, which is related to the magnetic drift. The numerical results on heat loads of beam ions corresponding to different toroidal magnetic fields are qualitatively consistent with the experimental results. Beam ion losses increase with the beam energy for the co-current NBIs and the counter-perpendicular NBI. We have studied the behavior of fast ions produced by a small section neutral beam (beamlet) by using the numeri...

中文翻译：

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在EAST上模拟中性离子束注入（NBI）快速离子的第一次轨道损失

通过使用轨道跟踪代码GYCAVA和NBI代码TGCO，详细研究了EAST托卡马克中的中性束注入（NBI）快速离子的第一轨道损耗模拟。具有壁边界的束离子损失小于具有最后封闭的通量表面边界的束离子损失。与没有射频波（RFW）天线的墙壁上的热负荷相比，带有RFW天线的墙壁上的热负荷在RFW天线附近分布得更局部。环形磁场的方向会极大地影响快速丢失的离子的最终位置，这与磁漂移有关。与不同的环形磁场相对应的束离子热负荷的数值结果在质量上与实验结果一致。对于并流NBI和反垂直NBI，束离子损失随束能量的增加而增加。我们已经使用数字研究了小截面中性束（子束）产生的快速离子的行为。