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Study of near SOL decay lengths in ASDEX Upgrade under attached and detached divertor conditions

机译：附着在附近的分离偏移条件下ASDEX升级附近的溶解度近距离

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摘要

A database with attached, partially detached and completely detached divertors has been constructed in ASDEX Upgrade discharges in both H-mode and L-mode plasmas with Thomson Scattering data suitable for the analysis of the upstream SOL electron profiles. By comparing upstream temperature decay width, lambda T-e,T- u, with the scaling of the SOL power decay width, lambda(q parallel to e) based on the downstream IR measurements, it is found that a simple relation based on classical electron conduction can relate lambda T-e,T- u and lambda(q parallel to e) well. The combined dataset can be described by both a single scaling and a separate scaling for H-modes and L-modes. For the single scaling, a strong inverse dependence of, lambda T-e,T-u on the separatrix temperature, T-e,T-u, is found, suggesting the classical parallel Spitzer-Harm conductivity as dominant mechanism controlling the SOL width in both L-mode and H-mode over a large set of plasma parameters. This dependence on T-e,T-u explains why, for the same global plasma parameters, lambda(q parallel to e) in L-mode is approximately twice that in H-mode and under detached conditions, the SOL upstream electron profile broadens when the density reaches a critical value. Comparing the derived scaling from experimental data with power balance, gives the cross-field thermal diffusivity as chi(perpendicular to) proportional to T-e(1/2)/n(e), consistent with earlier studies on Compass-D, JET and Alcator C-Mod. However, the possibility of the separate scalings for different regimes cannot be excluded, which gives results similar to those previously reported for the H-mode, but here the wider SOL width for L-mode plasmas is explained simply by the larger premultiplying coefficient. The relative merits of the two scalings in representing the data and their theoretical implications are discussed.
机译：具有附接，部分拆卸和完全分离的偏离器的数据库已经在ASDEX升级放电中构建了H模式和L模式等离子体，其具有适用于上游溶胶电子型材的分析的汤森散射数据。通过比较上游温度衰减宽度，Lambda TE，T-U，基于下游IR测量的溶胶功率衰减宽度，Lambda（Q平行于e），发现基于经典电子传导的简单关系可以很好地关联Lambda Te，T-U和Lambda（Q平行于e）。组合数据集可以通过单个缩放和H模式和L-MODES的单独缩放来描述。对于单一缩放，发现，发现，λT，TE，Te，Te，Te，TE，Te，Te，Te，Te，Te，Te，Te，Te，仿古平行烟盒损伤导电性作为控制L-模式和H-中的溶胶宽度控制溶胶宽度。在一大组等离子体参数上的模式。这依赖于TA，涂说明为什么对于相同的全局等离子体参数，L模式下的Lambda（Q平行于e）大约是H模式下的两倍，并且在拆卸条件下，当密度到达时，Sol上游电子曲线拓宽临界价值。从具有电力平衡的实验数据的衍生缩放比较，使横场热扩散率与TE（1/2）/ N（e）成比例，与表明-D，喷射和Alcator的早期研究一致c-mod。然而，不能排除不同制度的单独缩放的可能性，这给出了类似于先前报道的H模式的结果，但是在这里简单地解释了L模式等离子体的宽度宽度宽度，简单地解释了较大的预测系数。讨论了代表数据及其理论意义的两个缩放的相对优点。

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  • 来源
    《Plasma physics and controlled fusion》 |2017年第10期|共11页
  • 作者

    Sun H. J.; Wolfrum E.; Kurzan B.; Eich T.; Lackner K.; Scarabosio A.; Perez I. Paradela; Kardaun O.; Faitsch M.; Potzel S.; Stroth U.;

  • 作者单位

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

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

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

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

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

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

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

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

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

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

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

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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

    tokamak; SOL decay width; attached and detached divertor;

    机译：Tokamak;SOL腐烂宽度;附着和分离的倾斜器;

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