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Configurations of radiation driven targets for heavy ion fusion

机译：用于重离子聚变的辐射驱动靶的配置

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摘要

The baseline configuration of a radiation driven target for heavy ion fusion is a quasi-cylindrical hohlraum containing a fusion capsule and with radiation converters placed at opposite ends of the hohlraum. Ion beams enter each converter from opposite directions and are stopped by the material inside the converters. For a capsule that absorbs about 1 MJ of radiation energy and has an initial radius of 0.234 cm, calculations using the viewfactor code GERTIE indicate that the maximum initial capsule-to-hohlraum surface area ratio that can provide adequate time dependent symmetry for a capsule implosion is about 0.075. These calculations take into account the substantial inward expansion of the hohlraum wall. The capsule implosion and the wall motion are calculated using the one dimensional radiation hydrodynamics code HYADES and the conversion efficiencies of the radiation converters are studied using the two dimensional radiation hydrodynamics code LASNEX. The efficiency of energy coupling between the hohlraum and the capsule is 21%, the peak hohlraum temperature is 0.26 keV, and the energy gain can be as high as 80. If the converters are placed outside the hohlraum, their radii can be varied according to the beam focusing requirements, while the hohlraum dimensions remain unchanged. This provides a convenient way of calculating target gain as a function of converter radius. By bending the radiation converters by 90 ° , we can obtain a hohlraum configuration in which the ion beams can enter the target from a single direction, eliminating the need for bending the beams by 180°.
机译：用于重离子聚变的辐射驱动靶标的基线配置是准圆柱型透平管，其包含聚变囊并且在透平管的相对端放置有辐射转换器。离子束从相反的方向进入每个转换器，并被转换器内部的材料阻止。对于吸收约1 MJ辐射能量且初始半径为0.234 cm的胶囊，使用视场因子代码GERTIE进行的计算表明，最大的初始胶囊与大口径表面积之比可以为胶囊内爆提供足够的时间依赖性大约是0.075。这些计算考虑到了霍尔壁的实质性向内膨胀。使用一维辐射流体力学代码HYADES计算胶囊的内爆和壁运动，并使用二维辐射流体力学代码LASNEX研究辐射转换器的转换效率。滚珠与胶囊之间的能量耦合效率为21％，滚珠峰值温度为0.26 keV，能量增益可高达80。如果将转换器放置在滚珠之外，则其半径可以根据光束聚焦要求，而水平仪尺寸保持不变。这提供了一种根据转换器半径计算目标增益的便捷方法。通过将辐射转换器弯曲90°，我们可以得到一个水平配置，其中离子束可以从单个方向进入目标，而无需将离子束弯曲180°。

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  • 来源
    《Nuclear fusion》 |1995年第9期|p. 1125-1132|共8页
  • 作者

    D.D.-M. Ho; J.A. Harte; M. Tabak;

  • 作者单位

    Lawrence Livermore National Laboratory, University of California, Livermore, California, United States of America;

    Lawrence Livermore National Laboratory, University of California, Livermore, California, United States of America;

    Lawrence Livermore National Laboratory, University of California, Livermore, California, United States of America;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 原子核物理学、高能物理学;
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