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Investigation of the plasma behaviour in the dense plasma focus using laser light scattering techniques.

机译：使用激光散射技术研究密集等离子体焦点中的等离子体行为。

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摘要

The frequency spectrum of density fluctuations in a Plasma Focus device has been investigated by Thomson scattering of laser light. A ruby laser scattering diagnostic has been developed to enable the co-operatively scattered ion feature, Si(k,w) to be measured simultaneously along different density fluctuation k vectors. Data derived from this apparatus is interpreted in terms of the time and space variations of local plasma parameters such as electron and ion temperatures, drift velocity, bulk velocity and level of turbulence. The total scattered intensity, S.;= 1.4 keV respectively. An examination of the relative enhancementand broadening of S.;(k,w) along the various k-vectors has been interpretedin terms of current driven turbulence. The various mechanisms for inducing turbulence have been considered and lower-hybrid drift, electron-cyclotron drift and ion acoustic instabilities are thought to play a role in the various phases of the plasma discharge. The development of the multiple Je scattering diagnostic has overcome the ambiguity in interpreting scattering results from an irreproduceable inhomogeneous plasma. This problem has restricted the interpretation of the results in previous scattering experiments on the Plasma Focus using single Je vector scattering arrangements.;(k) is shown to depend on the direction in whichthe fluctuations are sampled by the scattering geometry, with scattered intensities along a Je vector parallel to the current flow enhanced considerably above thermal levels. The data is found to be most satisfactorily interpreted in terms of a double radial shell model of the plasma, each shell with its own characteristic particle temperatures, density, drift and bulk velocity. At peak compression of the pinch onto the z-axis of symmetry for example, the core plasma has typically electron and ion temperatures Te = 200 eV, Ti = 250 eV respectively, while the outer sheath region exhibits a shot to shot variation in the temperature structure, with Te=2.3 keV, Ti=850 eV and Te = L.65 keV, T.
机译：等离子聚焦装置中密度波动的频谱已通过激光的汤姆逊散射进行了研究。开发了红宝石激光散射诊断程序，可以沿着不同的密度波动k矢量同时测量协同散射的离子特征Si（k，w）。从该装置获得的数据是根据局部等离子体参数（例如电子和离子温度，漂移速度，整体速度和湍流水平）的时间和空间变化来解释的。总散射强度S. ＝ 1.4keV。沿各种k向量对S.（k，w）的相对增强和展宽的检查已根据电流驱动的湍流进行了解释。已经考虑了引起湍流的各种机制，并且认为下混合漂移，电子回旋加速器漂移和离子声不稳定性在等离子体放电的各个阶段中都起作用。多重Je散射诊断技术的发展克服了在解释不可再现的不均匀等离子体的散射结果时的歧义。这个问题限制了以前使用单Je矢量散射装置在等离子聚焦上进行散射实验的结果的解释。（k）显示取决于散射几何学对波动采样的方向，散射强度沿a与电流平行的矢量Je大大高于热能级。发现该数据是根据等离子体的双径向壳模型来最令人满意地解释的，每个壳具有其自身的特征粒子温度，密度，漂移和体积速度。例如，在收缩到对称z轴上的峰值时，核心等离子体通常分别具有电子和离子温度Te = 200 eV，Ti = 250 eV，而外部鞘层区域的温度则发生逐点变化结构为Te = 2.3 keV，Ti = 850 eV，Te = L.65 keV，T.

著录项

  • 作者

    Kirk, Richard Ernest.;

  • 作者单位

    University of London, Royal Holloway College (United Kingdom).;

  • 授予单位 University of London, Royal Holloway College (United Kingdom).;
  • 学科 Plasma physics.
  • 学位 Ph.D.
  • 年度 1985
  • 页码 320 p.
  • 总页数 320
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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