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Measurement of the complete core plasma flow across the LOC-SOC transition at ASDEX Upgrade

机译：在ASDEX升级过程中测量整个LOC-SOC过渡过程中的完整核心等离子体流量

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摘要

A newly installed core charge exchange recombination spectroscopy (CXRS) diagnostic at ASDEX Upgrade (AUG) enables the evaluation of the core poloidal rotation (u_(pol)) through the inboard-outboard asymmetry of the toroidal rotation with an accuracy of 0.5 to 1 km s~(-1). Using this technique, the total plasma flow has been measured in Ohmic L-mode plasmas across the transition from the linear to saturated ohmic confinement (LOC-SOC) regimes. The core poloidal rotation of the plasma around mid-radius is found to be always in the ion diamagnetic direction, in disagreement with neoclassical (NC) predictions. The edge rotation is found to be electron-directed and consistent with NC codes. This measurement provides as well the missing ingredient to evaluate the core E × B velocity (u_(E × B)) from data only, which can then be compared to measurements of the perpendicular velocity of the turbulent fluctuations (u_⊥) to gain information on the turbulent phase velocity (v_(ph)). The non neoclassical u_(pol from CXRS leads to good agreement between u_(E × B) and u_⊥ indicating that v_(ph) is small and at similar values as found with gyrokinetic simulations. Moreover, the data shows a shift of v_(ph) in the ion-diamagnetic direction at the edge after the transition from LOC to SOC consistent with a change in the dominant turbulence regime. The upgrade of the core CXRS system provides as well a deeper insight into the intrinsic rotation. This paper shows that the reversal of the core toroidal rotation occurs clearly after the LOC-SOC transition and concomitant with the peaking of the electron density.
机译：在ASDEX升级（AUG）上新安装的核心电荷交换重组光谱（CXRS）诊断程序可通过环形旋转的内侧-外侧不对称性来评估核心极向旋转（u_（pol）），准确度为0.5至1 km s〜（-1）。使用这种技术，已经测量了从线性到饱和欧姆约束​​（LOC-SOC）过渡过程中的欧姆L型等离子体的总等离子体流量。与新古典（NC）预测不一致，发现等离子体围绕中半径的核心极向旋转始终沿离子反磁方向进行。发现边缘旋转是电子方向的并且与NC代码一致。该测量结果还提供了缺少的成分，仅从数据中评估核心E×B速度（u_（E×B）），然后可以将其与湍流波动（u_⊥）的垂直速度的测量结果进行比较以获取信息湍流相速度（v_（ph））。非新古典的u_（CXRS的pol导致u_（E×B）与u_ good之间的一致性好，表明v_（ph）小，并且具有与陀螺动力学模拟相似的值。此外，数据显示v_（ ph）在从LOC过渡到SOC之后沿边缘的离子反磁方向，与主导湍流状态的变化一致，核心CXRS系统的升级也提供了对内在旋转的更深入了解。在LOC-SOC跃迁之后，伴随着电子密度的峰值，明显发生了铁芯环向旋转的反转。

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  • 来源
    《Nuclear fusion》 |2018年第2期|026013.1-026013.12|共12页
  • 作者

    A. Lebschy; R.M. McDermott; C. Angioni; B. Geiger; D. Prisiazhniuk; M. Cavedon; G.D. Conway; R. Dux; M.G. Dunne; A. Kappatou; T. Puetterich; U. Stroth; E. Viezzer;

  • 作者单位

    Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, D-85748 Garching, Germany,Physik-Department E28, Technische Universitaet Muenchen, D-85748 Garching, Germany;

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

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

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

    Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, D-85748 Garching, Germany,Physik-Department E28, Technische Universitaet Muenchen, D-85748 Garching, Germany;

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

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

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

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

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

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

    Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, D-85748 Garching, Germany,Physik-Department E28, Technische Universitaet Muenchen, D-85748 Garching, Germany;

    Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, D-85748 Garching, Germany,Department of Atomic, Molecular and Nuclear Physics, University of Seville, Avda. Reina Mercedes, 41012 Seville, Spain;

  • 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

    intrinsic rotation; LOC-SOC transition; Ohmic confinement; turbulent transport;

    机译：内在旋转LOC-SOC过渡;欧姆约束;湍流运输;

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