Progress in ion beam research at Sandia National Laboratories

IEEE 1989 International Conference on Plasma Science Pub Date : 1989-05-22 DOI:10.1109/PLASMA.1989.166092

R. Stinnett, T. Lockner, D. J. Johnson, R. Coates, T. Mehlhorn, M. Desjarlais, K. Bieg, A. Pregenzer, J. Woodworth, R. Leeper, J. Maenchen, C. Ruiz, W. Stygar, J. Bailey, R. Kensek, J. Quintenz, S. Rosenthal, S. Slutz, D. Hanson, P. McKay

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Abstract

Significant progress has been made recently in ion-beam production and focusing in both radial focusing and extraction geometries. Experiments on Sandia's Particle Beam Fusion Accelerator (PBFA) II have demonstrated efficient ion-beam generation, with 0.6 MJ of ions produced with 80% ion efficiency on experiments at the 3/4 energy level. With the flashover ion sources presently used on PBFA II, approximately half of the ion are protons. Horizontal FWHM proton focuses of approximately 5 mm have been obtained at diode voltages of over 5 MV. Experiments have revealed a linear scaling of FWHM with anode-cathode gap. Experiments and simulations have provided important information on the effects of both solenoidal and self-field focusing in the diode. Extraction diode experiments have been conducted in support of Sandia's light ion version of the US Department of Energy's Laboratory Microfusion Facility (LMF). Results from diode experiments on the 0.7-TW Mite accelerator together with an improved understanding of diode operation provide a reasonable path to a 30-MV, 1.2-MA LMF module.<>

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近年来，离子束的产生和聚焦在径向聚焦和提取几何形状方面都取得了重大进展。在桑迪亚的粒子束聚变加速器(PBFA) II上的实验证明了高效的离子束产生，在3/4能级的实验中产生了0.6 MJ的离子，离子效率为80%。目前在PBFA II上使用的闪络离子源，大约一半的离子是质子。在二极管电压大于5毫伏的情况下，获得了大约5毫米的水平FWHM质子聚焦。实验表明，FWHM与阳极-阴极间隙呈线性关系。实验和仿真为研究螺线管和自场聚焦对二极管的影响提供了重要的信息。萃取二极管实验已经进行，以支持美国能源部实验室微聚变设施(LMF)的桑迪亚光离子版本。在0.7 tw的Mite加速器上的二极管实验结果以及对二极管工作的改进理解为30 mv, 1.2 ma LMF模块提供了合理的路径。

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