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Study on ECH-assisted start-up using trapped particle configuration in KSTAR and application to ITER

机译：利用KSTAR中的捕获粒子配置进行ECH辅助启动的研究及其在ITER中的应用

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摘要

ECH-assisted start-up using trapped particle configuration (TPC) is firstly studied in a superconducting, conventional tokamak, KSTAR. First, improved and efficient start-up using TPC than conventional field null configuration (FNC) is achieved by enhanced pre-ionization plasma quality. TPC shows the broader operation window in terms of the poloidal field quality and the deuterium prefill pressure than that of FNC. Surprisingly the particle trapping enhances the plasma start-up performance even with much lower particle trapping ratio than that of spherical torus. Reliability of TPC with low trapping ratio is investigated by OD plasma evolution code, TECHPOD. Second, the characteristics of TPC start-up are explored with experiments and modellings. Two kind of start-up failure conditions are identified by the magnetic pitch and prefill pressure scan experiments: (i) low ionization rate; and (ii) low density condition. These experimental observation has consistency with TECHPOD modeling result. Finally, reliable ITER-relevant low toroidal electric field start-up using TPC is achieved with drastically improved success rate of start-up in KSTAR. In this experiments, validity of the ITER-like toroidally inclined ECH/ECCD injection is also expected. Time dependent ITER start-up scenario using TPC is proposed and the superiority of it than FNC is discussed.
机译：首先在超导传统托卡马克KSTAR中研究了使用捕集粒子结构（TPC）的ECH辅助启动。首先，通过提高预电离等离子体质量，可以实现比传统的空域配置（FNC）更好，更有效的TPC启动。与FNC相比，TPC在极场质量和氘预充压力方面显示出更宽的操作窗口。令人惊讶的是，即使与球形圆环相比，颗粒捕集率低得多，颗粒捕集也能增强等离子体的启动性能。通过OD等离子体演化代码TECHPOD，研究了具有低捕集率的TPC的可靠性。其次，通过实验和建模探索了TPC启动的特征。磁间距和预填充压力扫描实验确定了两种启动失败条件：（i）电离率低； （ii）低密度条件。这些实验观察结果与TECHPOD建模结果具有一致性。最终，在KSTAR中大大提高了启动成功率，从而实现了使用TPC进行可靠的ITER相关的低环形电场启动。在该实验中，还预期了类似ITER的环形倾斜ECH / ECCD注射的有效性。提出了使用TPC的与时间有关的ITER启动方案，并讨论了它比FNC的优越性。

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  • 来源
    《Nuclear fusion》 |2017年第12期|396-407|共12页
  • 作者

    Jeongwon Lee; Jayhyun Kim; YoungHwa An; Min-Gu Yoo; Y.S. Hwang; Yong-Su Na;

  • 作者单位

    Department of Nuclear Engineering, Seoul National University, Seoul, Republic of Korea;

    National Fusion Research Institute, Daejeon, Republic of Korea;

    National Fusion Research Institute, Daejeon, Republic of Korea;

    Department of Nuclear Engineering, Seoul National University, Seoul, Republic of Korea;

    Department of Nuclear Engineering, Seoul National University, Seoul, Republic of Korea;

    Department of Nuclear Engineering, Seoul National University, Seoul, 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

    KSTAR; ECH-assisted start-up; trapped particle configuration; ITER; OD modeling;

    机译：科士达;ECH协助启动;捕获的粒子构型;ITER;OD建模;

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