...
首页> 外文期刊>Nuclear fusion >SUMMARY OF RECENT STUDIES OF BEAM-DRIVEN BAE AND CHIRPING MODES IN DIII-D
【24h】

SUMMARY OF RECENT STUDIES OF BEAM-DRIVEN BAE AND CHIRPING MODES IN DIII-D

机译:DIII-D中波束驱动的BAE和线性调频模式的最新研究概述

获取原文
获取原文并翻译 | 示例
           

摘要

In high beta DIII-D plasmas with intense neutral beam injection, beta induced Alfven eigen-modes (BAE modes) are observed. These instabilities cause concentrated losses of > 50% of the fast ions and thus are of concern for future devices. The authors have now observed BAE modes and resultant fast ion loss in full field (2.0 T) discharges where the ratio of parallel velocity to Alfven speed is v_‖/v_A approx = 0.3. In a few discharges, they have also observed a new instability, a 'chirping' mode. These modes have frequencies between 50 and 200 kHz that 'whistle' down a factor of two in a single 2 ms burst. They occur in plasmas with relatively large values of fast ion beta ( < β_f > ) approx > 1%), Alfven speed (v_‖/v_A approx < 0.5) and plasma rotation (f_(rot) > 20 kHz). In contrast to the usual Alfven modes, which are fluid modes of the background plasma, the chirping instabilities seem to be beam modes that are nearly stationary in the plasma frame.
机译:在具有强烈中性束注入的高βDIII-D等离子体中,观察到β诱导的Alfven本征模式(BAE模式)。这些不稳定性导致快速离子的集中损失> 50%,因此是未来设备所关注的问题。作者现已观察到BAE模式以及在全场(2.0 T)放电中产生的快速离子损失,其中平行速度与Alfven速度之比为v __ / v_A约= 0.3。在几次放电中,他们还观察到了新的不稳定性,即“ chi”模式。这些模式的频率在50至200 kHz之间,可在单个2 ms突发中“降低”两倍。它们出现在具有相对较高的快速离子β(<β_f>)值 1%,Alfven速度(v _′/ v_A大约<0.5)和等离子体旋转(f_(rot)> 20 kHz)的等离子体中。与通常的Alfven模式(背景等离子体的流体模式)相反,线性调频不稳定性似乎是在等离子体框架中几乎静止的光束模式。

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