Generation and diagnostics of pulsed intense ion beams with an energy density of 10 J/cm².
Generation and diagnostics of pulsed intense ion beams with an energy density of 10 J/cm².
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DOI：
10.1063/1.4926564
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发表时间：
2015-07
期刊：
影响因子：
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通讯作者：
Y. Isakova;A. Pushkarev;I. Khailov;H. Zhong
中科院分区：
文献类型：
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作者：
Y. Isakova;A. Pushkarev;I. Khailov;H. Zhong
本文介绍了爆炸发射阴极二极管产生的千兆瓦级脉冲离子束的输运和聚焦的研究结果。实验是在TEMP-4M加速器双脉冲模式下进行的：第一个脉冲为负极(500 ns，100-150千伏)，第二个脉冲为正极(120 ns，200-250千伏)。为了减小光束发散角，我们对二极管的结构进行了改进。与阴极相比，阳极的宽度有所增加。我们研究了平面和聚焦条形二极管的不同配置。结果表明，经结构改造后，平面条形二极管形成的离子束发散角不超过3°(半角)。通过对聚焦二极管结构的改进，使光束发散角从8°减小到4°-5°，焦点能量密度提高到10-12J/cm(2)，能量密度变化从10%-15%减小到5%-6%。当测量高于靶材烧蚀阈值(3.5-4J/cm(2))的离子束能量密度时，我们使用了50%透明度的金属网来降低能量密度。研究了金属网对束流传输的影响。
The paper presents the results of a study on transportation and focusing of a pulsed ion beam at gigawatt power level, generated by a diode with explosive-emission cathode. The experiments were carried out with the TEMP-4M accelerator operating in double-pulse mode: the first pulse is of negative polarity (500 ns, 100-150 kV), and this is followed by a second pulse of positive polarity (120 ns, 200-250 kV). To reduce the beam divergence, we modified the construction of the diode. The width of the anode was increased compared to that of the cathode. We studied different configurations of planar and focusing strip diodes. It was found that the divergence of the ion beam formed by a planar strip diode, after construction modification, does not exceed 3° (half-angle). Modification to the construction of a focusing diode made it possible to reduce the beam divergence from 8° to 4°-5°, as well as to increase the energy density at the focus up to 10-12 J/cm(2), and decrease the shot to shot variation in the energy density from 10%-15% to 5%-6%. When measuring the ion beam energy density above the ablation threshold of the target material (3.5-4 J/cm(2)), we used a metal mesh with 50% transparency to lower the energy density. The influence of the metal mesh on beam transport has been studied.