Neutralization of negative hydrogen and deuterium ion beams using non-resonance adiabatic photon trap
Neutralization of negative hydrogen and deuterium ion beams using non-resonance adiabatic photon trap
复制标题
使用非共振绝热光子陷阱中和负氢和氘离子束
DOI：
10.1088/1741-4326/aacb02
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发表时间：
2018
期刊：
影响因子：
3.3
通讯作者：
A. Dunaevsky
中科院分区：
文献类型：
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作者：
S. Popov;M. Atlukhanov;A. Burdakov;A. Ivanov;A. Kasatov;A. Kolmogorov;R. Vakhrushev;M. Ushkova;A. Smirnov;A. Dunaevsky
介绍了负离子束在光子剥离靶中的中和实验结果。对于这些研究中使用的光束能量（6-10 keV），最大中和效率为95%。与气体或等离子体中和器相比，负离子束产生的正离子可以忽略不计。采用具有特殊形状高反射镜的非共振光子阱作为剥离靶。由于特殊的镜面形状，在光子在阱内反射和传播的过程中，即使镜面不闭合，也存在一些绝热守恒不变量，这些不变量限制了光子运动的可达体积。这种方法使得克服典型的法布里-珀罗电池的限制成为可能，这些限制要求高辐射质量、高质量的光学元件和非常高的电池机械稳定性。利用市售光纤激光器（λ = 1070 nm， Δλ = 7 nm, P = 2.1 kW）通过反射镜小孔泵送该阱。实验采用H梁和d梁进行。观察到的中和效率主要取决于反射镜的反射率、表面缺陷和激光抽运功率。
Experimental results on neutralization of negative ion beams in a photon stripping target are presented. For the energy of beams used in these studies (6–10 keV), the maximum neutralization efficiency is 95%. In contrast with gas or plasma neutralizers, the generation of positive ions from the negative ion beam was negligible. A non-resonance photon trap with highly reflecting mirrors of special shape was used as a stripping target. Due to a special mirror shape, in the process of photons reflections and propagation inside the trap there are some adiabatically conserved invariants that limits the volume accessible for photon motion even if the mirror surface is not closed. This approach makes it possible to overcome limitations typical for the Fabry–Perot cells, which require high radiation quality, high quality of the optical elements, and very high mechanical stability of the cell. The trap was pumped by commercially available fiber laser (λ = 1070 nm, Δλ = 7 nm, P = 2.1 kW) through a small hole in the mirror. The experiments were carried out with H- and D-beams. The observed neutralization efficiency depended mainly on the reflectivity of the mirrors, on defects on their surface, and on the laser pumping power.