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Influence of high magnetic field on access to stationary H-modes and pedestal characteristics in Alcator C-Mod

机译：高磁场对Alcator C-Mod中进入固定H模式和基座特性的影响

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摘要

Recent Alcator C-Mod experiments have explored access to and characteristics of H-modes at magnetic fields approaching 8 T, the highest field achieved to date in a diverted tokamak. The H-modes originated from L-mode densities ranging from 1.1 × 10~(20) m~(-3) to 2.8 × 10~(20) m~(-3), allowing insight into the density dependence of the H-mode power threshold at high magnetic field. This dependence is compared to predictions from the ITPA scaling law ([1]), finding that the law is approximately accurate at 7.8 T. However, the law underpredicted the high density H-mode threshold at lower magnetic field in previous C-Mod experiments ([2]), suggesting that the overall dependence of the threshold on magnetic field is weaker than predicted by the scaling law. The threshold data at 7.8 T also indicates that the onset of a low density branch at this magnetic field on C-Mod occurs below 1.4 × 10~(20) m~(-3), which is lower than predicted by an existing model for low density branch onset. The H-modes achieved steady-state densities ranging from 2.3 × 10~(20) m~(-3) to 4.4 × 10~(20) m~(-3), and higher transient densities, and had values of q_(95) from 3.3 to 6.0. This parameter range allowed the achievement of all three types of H-mode routinely observed at lower magnetic field on C-Mod: the stationary, ELM-suppressed Enhanced D_α (EDA) regime, seen at high densities and high values of q_(95); the nonstationary ELM-free regime, seen at lower densities and values of q_(95); and the ELMy regime, seen at low density, moderate q_(95), and specialized plasma shape. The parameter space in which these regimes occur at 7.8 T is consistent with lower magnetic field experience. Pressure pedestal height at 7.8 T is compared to EPED [3, 4] predictions, and a scaling law for EDA density pedestal height developed between 4.5 T and 6.0 T is updated to include fields from 2.7 T to 7.8 T. Overall, this analysis increases confidence in the use of low magnetic field experience to predict some elements of high magnetic field tokamak behavior.
机译：最近的Alcator C-Mod实验已经探索了在接近8 T的磁场中进入H模式的特性，这是迄今为止在转向的托卡马克中达到的最高磁场。 H模式起源于L模式密度，范围从1.1×10〜（20）m〜（-3）到2.8×10〜（20）m〜（-3），可以深入了解H-的密度依赖性。高磁场下的模式功率阈值。将这种依赖性与ITPA比例定律（[1]）的预测进行了比较，发现该定律在7.8 T时近似准确。但是，该定律在先前的C-Mod实验中低估了较低磁场下的高密度H模式阈值（[2]），表明阈值对磁场的总体依赖性弱于缩放定律所预测的。在7.8 T处的阈值数据还表明，在C-Mod上此磁场处低密度分支的发生发生在1.4×10〜（20）m〜（-3）以下，这比现有模型预测的低。低密度分支发作。 H模式的稳态密度范围从2.3×10〜（20）m〜（-3）到4.4×10〜（20）m〜（-3），并且瞬态密度更高，并且具有q_（ 95）从3.3到6.0。此参数范围可实现在C-Mod的较低磁场下常规观察到的所有三种H模式：在高密度和高q_（95）值下观察到的，稳定的，受ELM抑制的增强D_α（EDA）态。 ;在较低的密度和q_（95）的值下看到的非平稳无ELM机制；以及在低密度，中等q_（95）和特殊等离子体形状下看到的ELMy模式。这些状态在7.8 T发生的参数空间与较低的磁场经验相一致。将7.8 T的压力基座高度与EPED [3，4]预测进行比较，并更新了在4.5 T和6.0 T之间开发的EDA密度基座高度的缩放定律，以包括从2.7 T到7.8 T的磁场。使用低磁场经验的信心来预测高磁场托卡马克行为的某些要素。

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  • 来源
    《Nuclear fusion》 |2018年第4期|046004.1-046004.11|共11页
  • 作者

    E.A. Tolman; J.W. Hughes; S.M. Wolfe; S.J. Wukitch; B. LaBombard; A.E. Hubbard; E.S. Marmar; P.B. Snyder; M. Schmidtmayr;

  • 作者单位

    Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA, United States of America;

    Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA, United States of America;

    Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA, United States of America;

    Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA, United States of America;

    Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA, United States of America;

    Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA, United States of America;

    Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA, United States of America;

    General Atomics, San Diego, CA, United States of America;

    Institute of Applied Physics, TU Wien, Fusion@OEAW, 1040 Vienna, Austria;

  • 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

    pedestal; H-mode; EPED; threshold; EDA H-mode; 7.8 T;

    机译：基座H模式EPED;阈;EDA H模式;7.8吨;

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