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根据负离子-中性束注入器中强流负离子束引出、加速系统的特点,建立了为辅助设计强流负离子束系统而对其进行数值模拟研究的模型和计算程序,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,研究了系统束流密度、负离子初始温度以及负离子剥离损失和末电极孔位移等相关参数对负离子束光学特性的影响,并对系统的电、磁场位形进行了优化。对300keV,5电极负离子束系统的初步优化结果表明:该系统磁场可将伴随引出的电子束在低能下偏转到作为电子接收极的引出电极上;对引出流密度为21mA·cm~(-2)的H~-离子束,当H~-离子在引出区的剥离损失为20％时,由系统出射的各小束的均方根角度和85％小束的散角可分别达到0.327°和0.460°。
According to the characteristics of the negative ion beam and the accelerating system in the negative ion - neutral beam injector, a model and a calculation program were established to assist the design of a strong current negative ion beam system. The negative ion beam and the incident ion extraction The influence of system parameters such as beam density, initial temperature of negative ions, loss of negative ions and pore displacement of the final electrode on the optical properties of the negative ion beam was studied. , Magnetic field shape has been optimized. The results of preliminary optimization of a 300 keV, 5-electrode negative ion beam system show that the magnetic field of the system can deflect the incident electron beam at a low energy to the extraction electrode which serves as the electron receiving electrode; and the cathode current density of 21 mA · cm -2 ), The root-mean-square angles and the divergence angles of 85% of the beamlets emitted by the system can reach 0.327 ° and 0 °, respectively, when the lift-off loss of H ~ - ions in the lead-out region is 20% 0.460 °.