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首页> 外文期刊>Plasma physics and controlled fusion >Characterization of edge turbulence in different states of divertor detachment using reflectometry in the ASDEX Upgrade tokamak
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Characterization of edge turbulence in different states of divertor detachment using reflectometry in the ASDEX Upgrade tokamak

机译：在Asdex升级Tokamak中使用反射器分离不同状态的边缘湍流的特征

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摘要

Transport in the scrape-off layer (SOL) depends on the state of divertor detachment. L-mode discharges were analyzed where the state of divertor detachment is varied through a density ramp-up. By means of reflectometry measurements at the low (LFS) and the high field side (HFS), midplane density fluctuations are studied for the first time in ASDEX Upgrade simultaneously at both sides of the tokamak. Radial density fluctuation profiles (delta n(e)/n(e)) increase with radius in both the HFS and the LFS. It is found that in the SOL density fluctuations at the LFS have about a factor of two larger amplitude than at the HFS in agreement with ballooned transport. Density fluctuations at the LFS show a modest variation with increasing background density resulting mainly from a rise of low frequency components. Experimental results are in good agreement with an enhanced convection of filaments at the LFS at the beginning of outer divertor detachment leading to a flatter SOL density profile. In this phase of the discharge, density fluctuations measured at the HFS far-SOL display a strong increase, which may be associated with the presence of faster filaments originated at the LFS.
机译：刮削层（SOL）中的运输取决于倾斜器脱离状态。分析了L模式放电，其中偏移器拆卸状态通过密度斜坡而变化。借助于低（LFS）和高场侧（HFS）的反射测量测量，在Tokamak两侧同时在Asdex升级中第一次研究中间平面密度波动。径向密度波动曲线（Delta n（e）/ n（e））在HFS和LF中的半径增加。结果发现，在LFS的溶胶密度波动中，对于与气球运输的协议，LF的振荡波动大约是HFS的两个幅度。 LFS的密度波动显示了随着越来越多的背景密度而产生的适度变化，其主要来自低频分量的升高。实验结果与外翻脱离开始的LFS在LFS上有增强的长丝，导致平坦的溶胶密度剖面。在该放电的这种阶段，在HFS FAR-SOL处测量的密度波动显示出强烈的增加，这可能与起源于LFS的更快的长丝的存在相关。

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    Nikolaeva V.; Guimarais L.; Manz P.; Carralero D.; Manso M. E.; Stroth U.; Silva C.; Conway G. D.; Seliunin E.; Vicente J.; Brida D.; Aguiam D.; Santos J.; Silva A.;

  • 作者单位

    Univ Lisbon Inst Super Tecn Inst Plasmas &

    Fusao Nucl Lisbon Portugal;

    Univ Lisbon Inst Super Tecn Inst Plasmas &

    Fusao Nucl Lisbon Portugal;

    Max Planck Inst Plasma Phys Boltzmannstr 2 D-85748 Garching Germany;

    Max Planck Inst Plasma Phys Boltzmannstr 2 D-85748 Garching Germany;

    Univ Lisbon Inst Super Tecn Inst Plasmas &

    Fusao Nucl Lisbon Portugal;

    Max Planck Inst Plasma Phys Boltzmannstr 2 D-85748 Garching Germany;

    Univ Lisbon Inst Super Tecn Inst Plasmas &

    Fusao Nucl Lisbon Portugal;

    Max Planck Inst Plasma Phys Boltzmannstr 2 D-85748 Garching Germany;

    Univ Lisbon Inst Super Tecn Inst Plasmas &

    Fusao Nucl Lisbon Portugal;

    Univ Lisbon Inst Super Tecn Inst Plasmas &

    Fusao Nucl Lisbon Portugal;

    Max Planck Inst Plasma Phys Boltzmannstr 2 D-85748 Garching Germany;

    Univ Lisbon Inst Super Tecn Inst Plasmas &

    Fusao Nucl Lisbon Portugal;

    Univ Lisbon Inst Super Tecn Inst Plasmas &

    Fusao Nucl Lisbon Portugal;

    Univ Lisbon Inst Super Tecn Inst Plasmas &

    Fusao Nucl Lisbon Portugal;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 等离子体物理学;
  • 关键词

    fusion; plasma; tokamak; turbulence; reflectometry; density fluctuations; scrape-off layer;

    机译：融合;等离子体;Tokamak;湍流;反射区;密度波动;刮擦层;

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