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Formation of the internal transport barrier in KSTAR

机译：KSTAR内部运输壁垒的形成

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摘要

One of key objectives of tokamak experiments is the exploration of enhanced confinement regimes, and the access of the internal transport barrier (ITB) formation is dealt with an important physics issue in the most of major tokamaks. Also, the advanced tokamak scenario with ITB is expected to lead to a continuous reactor with high fusion power density. From that point of view, the formation of the ITB in KSTAR which is designed for long pulse operation capability is very important although its heating and current drive systems are not fully equipped yet. We have therefore assumed that an early injection of the full NBI power (~5.5 MW) during the current ramp-up would give a chance to form an internal barrier if the plasma could stay in the L-mode. To avoid the H-mode transition, we have produced inboard limited plasmas with detaching from the both upper and lower divertors. Using this approach, an ITB formation during L-mode has been observed which shows improved core confinement. Ion and electron temperature profiles show the barrier clearly in the temperature, and it was sustained for about 7 s in the dedicated experiment. This is the first stationary ITB observed in a full superconducting tokamak. This operation scenario with the ITB could be an alternative way to achieve a high performance regime in KSTAR, and the length of the ITB discharge could be extended even longer. In this paper, we present the formation of the ITB using measured and simulated characteristic profiles.
机译：托卡马克实验的主要目标之一是探索增强的约束机制，而在大多数主要托卡马克中，内部运输壁垒（ITB）的形成是一个重要的物理问题。同样，采用ITB的先进托卡马克方案有望产生具有高聚变功率密度的连续反应堆。从这个角度来看，尽管KSTAR的加热和电流驱动系统尚未完全配备，但为长脉冲操作能力而设计的ITB的形成非常重要。因此，我们假设如果等离子体可以保持在L模式，则在电流加速期间尽早注入NBI的全部功率（〜5.5 MW）将有机会形成内部势垒。为了避免H模式过渡，我们生产了内侧有限的等离子体，并与上下偏滤器分离。使用这种方法，已观察到在L模式下形成ITB，这显示出改善的岩心约束。离子和电子温度曲线清楚地显示了温度的障碍，在专门的实验中，该障碍持续了约7 s。这是在完整超导托卡马克中观察到的第一个固定式ITB。使用ITB的这种操作方案可能是在KSTAR中实现高性能方案的另一种方法，并且ITB放电的时间可能会延长甚至更长。在本文中，我们使用已测量和模拟的特征曲线来介绍ITB的形成。

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  • 来源
    《Nuclear fusion》 |2018年第1期|016019.1-016019.7|共7页
  • 作者

    J. Chung; H.S. Kim; Y.M. Jeon; J. Kim; M.J. Choi; J. Ko; K.D. Lee; H.H. Lee; S. Yi; J.M. Kwon; S.-H. Hahn; W.H. Ko; J.H. Lee; S.W. Yoon;

  • 作者单位

    National Fusion Research Institute, 169-148, Gwahak-ro, Yuseong-gu, Daejeon, 34133, Republic of Korea;

    National Fusion Research Institute, 169-148, Gwahak-ro, Yuseong-gu, Daejeon, 34133, Republic of Korea;

    National Fusion Research Institute, 169-148, Gwahak-ro, Yuseong-gu, Daejeon, 34133, Republic of Korea;

    National Fusion Research Institute, 169-148, Gwahak-ro, Yuseong-gu, Daejeon, 34133, Republic of Korea;

    National Fusion Research Institute, 169-148, Gwahak-ro, Yuseong-gu, Daejeon, 34133, Republic of Korea;

    National Fusion Research Institute, 169-148, Gwahak-ro, Yuseong-gu, Daejeon, 34133, Republic of Korea;

    National Fusion Research Institute, 169-148, Gwahak-ro, Yuseong-gu, Daejeon, 34133, Republic of Korea;

    National Fusion Research Institute, 169-148, Gwahak-ro, Yuseong-gu, Daejeon, 34133, Republic of Korea;

    National Fusion Research Institute, 169-148, Gwahak-ro, Yuseong-gu, Daejeon, 34133, Republic of Korea;

    National Fusion Research Institute, 169-148, Gwahak-ro, Yuseong-gu, Daejeon, 34133, Republic of Korea;

    National Fusion Research Institute, 169-148, Gwahak-ro, Yuseong-gu, Daejeon, 34133, Republic of Korea;

    National Fusion Research Institute, 169-148, Gwahak-ro, Yuseong-gu, Daejeon, 34133, Republic of Korea;

    National Fusion Research Institute, 169-148, Gwahak-ro, Yuseong-gu, Daejeon, 34133, Republic of Korea;

    National Fusion Research Institute, 169-148, Gwahak-ro, Yuseong-gu, Daejeon, 34133, Republic of Korea;

  • 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

    tokamak; KSTAR; internal transport barrier; ITB;

    机译：托卡马克科士达;内部运输壁垒;ITB;

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