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Evolution of the central safety factor during stabilized sawtooth instabilities at KSTAR

机译：KSTAR稳定的锯齿不稳定性期间中心安全系数的演变

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摘要

A motional Stark effect (MSE) diagnostic has recently been installed in the KSTAR tokamak. A difficulty faced at KSTAR and common to other MSE diagnostics is calibration of the system for absolute measurements. In this report we present our novel calibration routine and discuss first results, evaluating the evolution of the the central safety factor during sawtooth instabilities. The calibration scheme ensures that the bandpass filters typically used in MSE systems are aligned correctly and identifies and removes systematic offsets present in the measurement. This is verified by comparing the reconstructed safety factor profile against various discharges where the locations of rational q surfaces have been obtained from MHD markers. The calibration is applied to analyse the evolution of q_0 in a shot where the sawteeth are stabilized by neutral beam injection. Within the analysed sawtooth periods q_0 drops below unity during the quiescent phase and relaxes close to or slightly above unity at the sawtooth crash. This finding is in line with the classical Kadomtsev model of full magnetic reconnection and earlier findings at JET.
机译：最近在KSTAR托卡马克中安装了运动斯塔克效应（MSE）诊断程序。 KSTAR面临的一个困难，是其他MSE诊断所共有的困难，是对系统进行绝对测量的校准。在本报告中，我们介绍了我们新颖的校准程序并讨论了第一个结果，评估了锯齿不稳定性期间中央安全系数的变化。校准方案可确保MSE系统中通常使用的带通滤波器正确对准，并识别并消除测量中存在的系统偏移。通过将重构的安全系数曲线与从MHD标记获得有理q面位置的各种放电进行比较，可以验证这一点。校准用于分析镜头中q_0的演变，在镜头中通过中性束注入使锯齿稳定。在分析的锯齿周期内，q_0在静态阶段下降到低于统一性，并在锯齿碰撞时放松到接近或稍高于统一。这一发现与经典的Kadomtsev全磁重连接模型以及JET的早期发现是一致的。

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  • 来源
    《Nuclear fusion》 |2018年第1期|016030.1-016030.9|共9页
  • 作者

    M.C.C. Messmer; J. Ko; J. Chung; M.H. Woo; K.-D. Lee; R.J.E. Jaspers;

  • 作者单位

    Eindhoven University of Technology (TU/e), 5600MB Eindhoven, Netherlands;

    National Fusion Research Institute (NFRI), Daejeon 34133, Republic of Korea,University of Science and Technology (UST), Daejeon 34113, Republic of Korea;

    National Fusion Research Institute (NFRI), Daejeon 34133, Republic of Korea;

    National Fusion Research Institute (NFRI), Daejeon 34133, Republic of Korea;

    National Fusion Research Institute (NFRI), Daejeon 34133, Republic of Korea;

    Eindhoven University of Technology (TU/e), 5600MB Eindhoven, Netherlands,Department of Applied Physics, Ghent University, 9000 Ghent, Belgium;

  • 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

    MSE; sawtooth; central safety factor; motional Stark effect; q_0; calibration;

    机译：MSE;锯齿中央安全系数;运动斯塔克效应;q_0;校准;

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