• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>International Symposium on Discharges and Electrical Insulation in Vacuum >Numerical simulation of plasma expansion at different rates of current rise in the spark stage of a vacuum arc
【24h】

Numerical simulation of plasma expansion at different rates of current rise in the spark stage of a vacuum arc

机译：真空电弧火花阶段不同电流上升速率下等离子体膨胀的数值模拟

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A kinetic numerical simulation of an expanding current-carrying plasma plume of the explosive-emission center in the vacuum breakdown was performed. It was found that at the current density rise less than about of 109 A/cm2/s the expansion of the plasma generally has a self-similar character. At the higher current density growth rate the plasma expansion has an essentially non-stationary character. The high density current leads first to the development of ion-acoustic instability and then to the development of Buneman instability. Strong current instability leads to the rupture of the plasma and the creation of conditions for the collective (anomalous) acceleration of ions to the cathode and the anode. Anomalously accelerated ions with energies up to 80 keV create an additional powerful heat flux to the cathode, which should facilitate the reproduction of the cathode spots in the spark stage of vacuum discharge.
机译：进行了真空击穿中爆炸发射中心的载流等离子羽流膨胀的动力学数值模拟。已经发现，在电流密度上升小于约109A / cm 2 / s时，等离子体的膨胀通常具有自相似特性。在较高的电流密度增长速率下，等离子体膨胀具有基本上非平稳的特性。高密度电流首先导致离子声不稳定性的发展，然后导致布尼曼不稳定性的发展。强烈的电流不稳定性会导致等离子体破裂，并为离子向阴极和阳极的集体（异常）加速创造条件。能量高达80 keV的异常加速的离子会向阴极产生额外的强大热通量，这应有助于在真空放电的火花阶段重现阴极斑点。

著录项

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