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High-aecuracy characterization of the edge radial electric field at ASDEX Upgrade

机译：ASDEX升级时边缘径向电场的高精确度表征

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摘要

The installation of a new poloidal charge exchange recombination spectroscopy (CXRS) diagnostic at ASDEX Upgrade (AUG) has enabled the determination of the radial electric field, E_r, using the radial force balance of impurity ions. E_r has been derived from charge exchange (CX) spectra measured on different impurity species, such as He~(2+), B~(5+), C~(6+) and Ne~(10+). The resulting E_r profiles are found to be identical within the uncertainties regardless of the impurity species used, thus, demonstrating the validity of the diagnostic technique. The E_r profile has been compared to the main ion pressure gradient term, which is found to be the dominant contribution at the plasma edge, thus, supporting that the E_r well is created by the main ion species. The E_r profile has been measured in different confinement regimes including L-, I- and H-mode. The depth of the E_r well and the magnitude of the E_r shear are correlated with the ion pressure at the pedestal top. The temporal evolution of the measured CX profiles and the resulting E_r have been studied during an edge-localized mode (ELM) cycle. At the ELM crash, the E_r minimum is less deep resulting in a reduction of the E × B shear. Within 2 ms after the ELM crash, the edge kinetic profiles have nearly recovered and the E_r well is observed to recover simultaneously. In high density type-Ⅰ ELM mitigated H-mode plasmas, obtained via externally applied magnetic perturbations (MPs) with toroidal mode number n = 2, no clear effect on E_r due to the MPs has been observed.
机译：在ASDEX升级（AUGEX）上安装了新的二元电荷交换复合光谱（CXRS）诊断程序，可以使用杂质离子的径向力平衡来确定径向电场E_r。 E_r是从在不同的杂质种类（例如He〜（2 +），B〜（5 +），C〜（6+）和Ne〜（10+））上测得的电荷交换（CX）光谱得出的。无论使用何种杂质种类，都在不确定性范围内发现所得的E_r轮廓相同，因此证明了诊断技术的有效性。已将E_r分布图与主要离子压力梯度项进行了比较，发现这是等离子体边缘的主要贡献，因此支持E_r阱由主要离子物种产生。 E_r轮廓已在不同的限制条件下进行了测量，包括L模式，I模式和H模式。 E_r井的深度和E_r剪切的大小与基座顶部的离子压力相关。在边缘定位模式（ELM）周期中，已研究了测得的CX轮廓的时间演变和生成的E_r。在ELM碰撞时，E_r最小值较小，导致E×B剪切力减小。在ELM碰撞后2毫秒内，边缘动力学曲线几乎恢复，并且观察到E_r井同时恢复。在高密度I型ELM缓和的H型等离子体中，通过外部施加的磁扰动（MP）的环形模式编号n = 2，没有观察到由于MP引起的对E_r的明显影响。

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  • 来源
    《Nuclear fusion》 |2013年第5期|5.1-5.13|共13页
  • 作者

    E. Viezzer; T. Puetterich; G.D. Conway; R. Dux; T. Happel; J.C. Fuchs; R.M. McDermott; F. Ryter; B. Sieglin; W. Suttrop; M. Willensdorfer; E. Wolfrum;

  • 作者单位

    Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, Boltzmannstr. 2, 85748 Garching, Germany;

    Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, Boltzmannstr. 2, 85748 Garching, Germany;

    Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, Boltzmannstr. 2, 85748 Garching, Germany;

    Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, Boltzmannstr. 2, 85748 Garching, Germany;

    Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, Boltzmannstr. 2, 85748 Garching, Germany;

    Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, Boltzmannstr. 2, 85748 Garching, Germany;

    Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, Boltzmannstr. 2, 85748 Garching, Germany;

    Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, Boltzmannstr. 2, 85748 Garching, Germany;

    Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, Boltzmannstr. 2, 85748 Garching, Germany;

    Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, Boltzmannstr. 2, 85748 Garching, Germany;

    Institut fuer Angewandte Physik, Technische Universitaet Wien, Association EURATOM-OEAW, 1040 Vienna, Austria;

    Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, Boltzmannstr. 2, 85748 Garching, Germany;

  • 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);
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