非理想氢原子束真空环境长程传输模拟研究

Simulation of long-range transport of non-ideal hydrogen atom beams in vacuum environment

模拟研究了非理想氢原子束在真空环境下的长程传输效应。根据中性化程度的不同,将非理想束分为欠中性束和过中性束。通过建立束流传输的准电磁模型,研究了束流密度、中性化因子、空间磁场和弹性散射等因素对非理想氢原子束的影响。结果表明:对于欠中性束,负氢离子的存在对氢原子的传输几乎没有影响,因此欠中性束的发射装置可以考虑去除偏置磁场,以减小设备体积和质量;对于过中性束,束流损失率与束流密度和中性化因子有关,即束流密度越大,束流损失越大;中性化因子越高,束流损失就越高;而无论是欠中性束还是过中性束,空间磁场和粒子间的弹性散射对其传输都没有影响。

Neutral beam has potential applications in space debris cleanup and space exploration.As that neutral beam prepared by ion source is not ideal in practice,this paper simulates the long-range transmission effect of non-ideal hydrogen beam in vacuum environment.According to the degree of neutralization,non-ideal beams are divided into under-neutral beams and over-neutral beams.The effects of beam density,neutralization factor,spatial magnetic field and elastic scattering on the nonideal hydrogen beam are studied by establishing a quasi-electromagnetic model of beam transmission.The results show that the presence of negative hydrogen ions has no effect on the transmission of hydrogen atoms in the under-neutral beam,thus the bias magnetic field can be removed to reduce the volume and mass of the device.For the over-neutral beam,the loss ratio is related to the beam density and neutralization factor,that is,the higher the beam density,the greater the beam loss;the higher the neutralization factor,the higher the beam loss.The magnetic field and the elastic scattering between particles have no effect on the propagation of either the under-neutral or over-neutral beams.