首页> 外文期刊>Journal of Applied Physics >The dynamics of coherent modes of gradient drift instabilities in a small magnetron discharge plasma
【24h】

The dynamics of coherent modes of gradient drift instabilities in a small magnetron discharge plasma

机译:小磁控排放等离子体中梯度漂移不稳定性相干模式的动态

获取原文
获取原文并翻译 | 示例
获取外文期刊封面目录资料

摘要

We report on the dynamic behavior of gradient-driven drift waves in a strongly obstructed magnetron discharge. The magnetron has a magnetic topology that results in a toroidal plasma within the gap and supports the development of very coherent modes of rotating plasma structures. The modes and their rotation are present over a wide range of conditions, and the rotation is retrograde to the usual externally imposed E × B direction. This feature seems to be unique to this device and is attributed to a field reversal due to the strong anode-directed electron diffusion that arises from large axial plasma density gradients. A multi-fluid model is proposed, and a Fourier analysis of the linearized equations results in the identification of conditions that support the growth of these instabilities and their transitions across mode symmetries, controlled experimentally by varying the discharge voltage. The model also provides insight on the possible mechanism driving cross-field particle transport. Experiments are carried out with a segmented anode to confirm the localized current flow concomitant with the presence of a coherent structure. These segment currents together with high speed videography unambiguously confirm the direction of plasma rotation and reveal the existence of a stochastic regime between voltage-controlled mode transitions. An analysis of the segment currents in this regime indicates that the lower frequency state decays into a spectrum of coherent higher frequency states that exhibit features consistent with a three-wave nonlinear parametric mixing process.
机译:我们报告了强烈阻塞的磁控电流放电中梯度驱动漂移波的动态行为。磁控管具有磁性拓扑,其导致间隙内的环形等离子体并支撑旋转等离子体结构的非常相干模式的发展。模式及其旋转在很宽的条件下存在,并且旋转逆行到通常的外部施加的E×B方向。该特征似乎是该设备的独特性,并且由于来自大轴向等离子体密度梯度而产生的强阳极定向的电子扩散,因此归因于场反转。提出了一种多流体模型,并且对线性化方程的傅里叶分析导致通过改变放电电压来通过改变放电电压来控制支持这些不稳定性的增长及其过渡的条件。该模型还提供了对驱动跨场粒子传输的可能机制的洞察力。通过分段的阳极进行实验,以确认局部电流随着相干结构的存在而伴随。这些分段电流与高速摄像机一起毫不含糊地确认等离子体旋转方向,并揭示了电压控制模式转换之间的随机状态的存在。在该制度中对分段电流的分析表明,较低频率状态衰减到具有三波非线性参数混合过程一致的特征的相干较高频率状态的光谱。

著录项

  • 来源
    《Journal of Applied Physics》 |2020年第22期|223301.1-223301.14|共14页
  • 作者

    A.Marcovati; T.Ito; M.A.Cappelli;

  • 作者单位

    High Temperature Gasdynamics Laboratory Stanford University Stanford California 94305 USA;

    High Temperature Gasdynamics Laboratory Stanford University Stanford California 94305 USA Center for Atomic and Molecular Technologies Graduate School of Engineering Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan;

    High Temperature Gasdynamics Laboratory Stanford University Stanford California 94305 USA;

  • 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
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号