Nonideal effects in the operation of a paraxial diode with gas cell focusing

D. Welch, N. Bruner, D. Rose, K. Hahn, B. Oliver
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Abstract

Paraxial electron diodes with gas transport cells have been used to focus intense electron beams onto a high-Z target producing bremsstrahlung radiation. This configuration is being fielded on the recently commissioned RITS-6 accelerator producing 35-kA current and 10-MeV energy electron beams. Direct ionization of the beam and avalanche from the electron secondaries drive a break down of the gas that rapidly increases the gas cell conductivity. Non-ideal effects result in an axial sweep of the beam focus position that ultimately limits the radiographic spot. These effects include cathode plasma evolution, stimulated emission of anode ions, and magnetic diffusion in the gas cell. The gas breakdown is studied with hybrid particle-in-cell simulations using several different gas chemistry models including kinetic Monte Carlo interaction. In addition, we test the validity of these models against measured time- dependent beam spot and radiation production rates.
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带气池聚焦的近轴二极管工作中的非理想效应
利用带气体输运电池的副轴电子二极管将强电子束聚焦到高z目标上,产生轫致辐射。这种配置正在最近服役的RITS-6加速器上部署,产生35ka电流和10mev能量的电子束。电子束的直接电离和电子二次产生的雪崩驱动气体的分解,从而迅速增加气体电池的电导率。不理想的影响导致光束焦点位置的轴向扫描,最终限制了射线照相斑点。这些影响包括阴极等离子体演化、阳极离子的受激发射和气体电池中的磁扩散。采用几种不同的气体化学模型,包括动力学蒙特卡罗相互作用,对混合粒子在电池内的气体击穿进行了模拟研究。此外,我们还测试了这些模型的有效性,以测量时间相关的光束光斑和辐射产生率。
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