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Hydrogen pellet ablation and acceleration by current in high temperature plasmas

机译:高温等离子体中氢颗粒的烧蚀和电流加速

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摘要

Hydrogen pellet ablation and acceleration by current in high temperature plasmas are analysed. The present state of ablation theory and experiment is discussed and an ablation model is formulated. This model takes into account the energy distribution of the particles (both electrons and ions)participating in the ablation process, electrostatic effects of the cloud charging and changes of the pellet form during ablation. Without charging the pellet form tends to a shape resembling a lentil while it remains almost spherical if charged. A new algorithm for ablation rate calculations that can be used for an arbitrary initial form of the pellet is described. The results of this kinetic two dimensional approach differ from those of the Parks ablation scaling used in the ITER design by not more than 30%. Plasma shielding effects are not significant in the ablation if strong turbulence in the cloud is taken into account. Acceleration analysis is based on the Braginskii corrected electron distribution function. For the lentil mode of ablation, acceleration is higher than those for the charged mode by a factor of 1.76. The ablation models are compared with the experiments on T-10, JET, TFTR, Heliotron-E and Tore Supra. A sensitivity analysis shows that pellet size and electron temperature are the most significant factors for determination of the penetration length. The available database of penetration lengths is not sufficient for distinguishing between the models. Acceleration for the charged mode correlates with experimental data better than that for the lentil mode. The effect of the hot ions is seen on the ablation. Finally, ablation at reactor relevant plasma and pellet parameters is considered. This range of the plasma parameters needs a correction of the ablation scaling as follows: dN/dt ~ n~(0.453)_eT~(1.72)_er~(1.443)_pM~(-0.283)_i where n_e and T_e are the electron density and temperature, respectively, and r_p and M_i are the pellet radius and atomic mass.
机译:分析了氢等离子体在高温等离子体中的烧蚀和加速作用。讨论了烧蚀理论和实验的现状,建立了烧蚀模型。该模型考虑了参与消融过程的粒子(电子和离子)的能量分布,云带电的静电效应以及消融过程中颗粒形式的变化。不装料时,丸粒形式趋向于类似于扁豆的形状,而如果装料则其几乎保持球形。描述了一种新的烧蚀率计算算法,该算法可用于任意初始形式的颗粒。这种动力学二维方法的结果与ITER设计中使用的Parks消融标度的结果相差不超过30%。如果考虑到云中强烈的湍流,等离子体屏蔽效果在消融中并不重要。加速度分析基于Braginskii校正的电子分布函数。对于扁豆消融模式,加速度比带电模式的加速度高1.76倍。将消融模型与T-10,JET,TFTR,Heliotron-E和Tore Supra上的实验进行了比较。敏感性分析表明,颗粒大小和电子温度是确定穿透长度的最重要因素。可用的穿透长度数据库不足以区分模型。带电模式下的加速度与实验数据的相关性比小扁豆模式下的更好。可以看到热离子对消融的影响。最后,考虑在反应器相关的血浆和颗粒参数下进行烧蚀。此等离子参数范围需要如下修正烧蚀比例:dN / dt〜n〜(0.453)_eT〜(1.72)_er〜(1.443)_pM〜(-0.283)_i其中n_e和T_e是电子密度r_p和M_i分别是颗粒半径和原子质量。

著录项

  • 来源
    《Nuclear fusion》 |1995年第4期|p. 431-453|共23页
  • 作者

    B.V. Kuteev;

  • 作者单位

    State Technical University, St. Petersburg, Russia;

  • 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;
  • 关键词

  • 入库时间 2022-08-18 01:10:38

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