• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Plasma physics and controlled fusion >Energetic particles in spherical tokamak plasmas
【24h】

Energetic particles in spherical tokamak plasmas

机译：心脏粒子在球形托卡马克等离子体中

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Spherical tokamaks (STs) typically have lower magnetic fields than conventional tokamaks, but similar mass densities. Suprathermal ions with relatively modest energies, in particular beaminjected ions, consequently have speeds close to or exceeding the Alfven velocity, and can therefore excite a range of Alfvenic instabilities which could be driven by (and affect the behaviour of) fusion alpha-particles in a burning plasma. STs heated with neutral beams, including the small tight aspect ratio tokamak (START), the mega amp spherical tokamak (MAST), the national spherical torus experiment (NSTX) and Globus-M, have thus provided an opportunity to study toroidal Alfven eigenmodes (TAEs), together with higher frequency global Alfven eigenmodes (GAEs) and compressional Alfven eigenmodes (CAEs), which could affect beam current drive and channel fast ion energy into bulk ions in future devices. In NSTX GAEs were correlated with a degradation of core electron energy confinement. In MAST pulses with reduced magnetic field, CAEs were excited across a wide range of frequencies, extending to the ion cyclotron range, but were suppressed when hydrogen was introduced to the deuterium plasma, apparently due to mode conversion at ion-ion hybrid resonances. At lower frequencies fishbone instabilities caused fast particle redistribution in some MAST and NSTX pulses, but this could be avoided by moving the neutral beam line away from the magnetic axis or by operating the plasma at either high density or elevated safety factor. Fast ion redistribution has been observed during GAE avalanches on NSTX, while in both NSTX and MAST fast ions were transported by saturated kink modes, sawtooth crashes, resonant magnetic perturbations and TAEs. The energy dependence of fast ion redistribution due to both sawteeth and TAEs has been studied in GlobusM. High energy charged fusion products are unconfined in present-day STs, but have been shown in MAST to provide a useful diagnostic of beam ion behav
机译：球形Tokamaks（STS）通常具有比常规Tokamaks更低的磁场，而是具有相似的质量密度。具有相对适度的能量，特别是被束缚离子的同性恋离子，因此具有接近或超过Alfven速度的速度，因此可以激发一系列的粘性型载体，其可以由（并影响）融合α-粒子的行为驱动燃烧的等离子体。与中性梁加热的STS，包括小的紧密纵横比托卡卡克（开始），Mega AMP球形Tokamak（桅杆），国家球形托鲁斯实验（NSTX）和Globus-M，因此提供了研究环形Alfven特征模糊的机会（ TAES），与较高频率全球ALFVEN特征码（GAES）和压缩ALFVEN特征模（CAES）一起，这可能会影响梁电流驱动和通道快速离子能量在未来的设备中的散装离子中。在NSTX GAE中与核心电子能源限制的降解相关。在具有缩小磁场的桅杆脉冲中，在宽范围的频率上激发CaES，延伸到离子回旋速度，但在将氢气引入氘血浆时被抑制，显然是由于离子离子混合共振的模式转化产生。在较低的频率下，钓鱼骨不稳定性引起了一些桅杆和NSTX脉冲中的快速粒子再分配，但是可以通过将中性光束线远离磁轴移动或通过高密度或升高的安全系数操作等离子体来避免这种情况。在NSTX上的GAE雪崩期间已经观察到快速离子再分分配，而在NSTX和桅杆上，通过饱和的扭结模式，锯齿崩溃，谐振磁性扰动和Taes运输。 Globusm研究了由于Sawteeth和TAES引起的快速离子再分配的能量依赖性。高能量带电融合产品在现今的STS中不合适，但已在桅杆中显示，以提供有用的束离子的诊断

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