• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Fusion energy 1998 >JT-60U HIGH PERFORMANCE REGIMES
【24h】

JT-60U HIGH PERFORMANCE REGIMES

机译：JT-60U高性能系统

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

High performance regimes of JT-60U plasmas are presented with an emphasis upon the results from the use of a semi-closed pumped divertor with W-shaped geometry. Plasma performance in transient and quasi steady states has been significantly improved in reversed shear and high- βp regimes. The reversed shear regime elevated an equivalent Q_(DT)~(eq) transiently up to 1.25 (n_D(0)τ_ET_i(0)=8.6×10~(20) m-3·s·keV) in a reactor-relevant thermonuclear dominant regime. Long sustainment of enhanced confinement with internal transport barriers (ITBs) with a fully non-inductive current drive in a reversed shear discharge was successfully demonstrated with LH wave injection. Performance sustainment has been extended in the high- |3p regime with a high triangularity achieving a long sustainment of plasma conditions equivalent to Q_(DT)~(eq)～0.16 (n_D(0)τ_ET_i(0)～1.4×10~(20)m~(-3)·s· keV) for ～4.5 s with a large non-inductive current drive fraction of 60-70% of the plasma current. Thermal and particle transport analyses show significant reduction of thermal and particle diffusivities around ITB resulting in a strong Er shear in the ITB region. The W-shaped divertor is effective for He ash exhaust demonstrating steady exhaust capability of τ_(He)*/τ_E ～3-10 in support of ITER. Suppression of neutral back flow and chemical sputtering effect have been observed while MARFE onset density is rather decreased. Negative-ion based neutral beam injection (N-NBI) experiments have created a clear H-mode transition. Enhanced ionization cross-section due to multi-step ionization processes was confirmed as theoretically predicted. A current density profile driven by N-NBI is measured in a good agreement with theoretical prediction. N-NBI induced TAE modes characterized as persistent and bursting oscillations have been observed from a low hot beta of < β_h>～0.1-0.2% without a significant loss of fast ions.
机译：介绍了JT-60U等离子体的高性能方案，重点是使用具有W形几何形状的半封闭泵浦分流器的结果。在反向剪切和高βp态下，瞬态和准稳态下的等离子体性能已得到显着改善。反向剪切状态在与反应堆有关的热核中将等效Q_（DT）〜（eq）瞬时提高至1.25（n_D（0）τ_ET_i（0）= 8.6×10〜（20）m-3·s·keV）统治政权。 LH波注入成功地证明了在反向剪切放电中具有完全无感性电流驱动的内部输运势垒（ITB）增强的约束的长期维持。在具有高三角形性的高| 3p范围内，性能维持得到了扩展，实现了等效于Q_（DT）〜（eq）〜0.16（n_D（0）τ_ET_i（0）〜1.4×10〜（ 20）m〜（-3）·s·keV）持续约4.5 s，无感电流驱动比例为等离子电流的60-70％。热和颗粒传输分析表明，ITB周围的热和颗粒扩散性显着降低，从而导致ITB区域的强Er剪切。 W型分流器对He灰分废气有效，证明了ITER支持τ_（He）* /τ_E〜3-10的稳定排气能力。已观察到中性回流的抑制和化学溅射效果，而MARFE起始密度却大大降低。基于负离子的中性束注入（N-NBI）实验创建了清晰的H模式过渡。如理论上所预测的，证实了由于多步电离过程而导致的增强的电离横截面。由N-NBI驱动的电流密度曲线与理论预测吻合良好。从<β_h>〜0.1-0.2％的低热β中观察到了N-NBI诱导的TAE模式，其特征是持续振荡和爆发振荡，而没有明显的快速离子损失。

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