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.
光子剥离靶中负离子束中和的实验结果被呈现。在本研究所用的束能量（6–10 keV）下，最大中和效率为95%。与气体或等离子体中和器相比，负离子束产生正离子的过程可忽略不计。采用具有特殊形状高反射镜的非共振光子陷阱作为剥离靶。由于镜面的特殊形状，在光子于陷阱内反射和传播的过程中，存在一些绝热守恒不变量，即使镜面不闭合，也限制了光子运动的可及体积。这种方法使得克服法布里–珀罗腔的典型限制成为可能，后者要求高辐射质量、高光学元件质量以及极高的机械稳定性。该陷阱通过市售光纤激光器（λ = 1070 nm，Δλ = 7 nm，P = 2.1 kW）经镜面上的小孔进行泵浦。实验使用H束和D束进行。观察到的中和效率主要取决于镜面的反射率、镜面表面的缺陷以及激光泵浦功率。