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根据用于负离子-中性束注入器的强流负离子引出、加速系统的特点,建立了负离子束系统的数值模拟模型和程序,以便辅助该系统的设计。计算了负离子束和伴随引出的电子束在系统电、磁场共同作用下的运动行为,研究了束密度、负离子初始温度和剥离损失及末电极孔位移等相关参数对负离子束光学特性的影响,优化了电、磁场位形。对 300 kV,5 电极负离子束系统的初步优化结果表明:该系统磁场可以在低能下将电子束偏转到作为接收器的引出电极上;设 H-离子在引出区的剥离损失为 20%并且引出的 H-束密度为 21 mA·cm- 时,所有出射小束的均方根散角和 85%束散角分别 2为 0.327°和 0.460°。
According to the negative ion - neutral beam injector for the extraction and acceleration of strong current and negative ions, the numerical simulation model and program of the negative ion beam system are established to assist the design of the system. The kinetic behaviors of the negative ion beam and the accompanying emanated electron beam under the combined action of the electric and magnetic fields of the system were calculated. The effects of the beam density, the initial temperature of the negative ion, the peel loss and the displacement of the final electrode on the optical properties of the negative ion beam were studied. Electricity, magnetic field shape. The preliminary optimization of the 300 kV, 5-electrode negative ion beam system shows that the magnetic field of the system can be used to deflect the electron beam to the extraction electrode as a receiver at a low energy. Suppose H- ions have a peel loss of 20% H-beam density of 21 mA · cm-1, the mean square angle and the 85% beam spread angle of all outgoing beamlets were 0.327 ° and 0.460 °, respectively.