Evidence for a poloidally localized enhancement of radial transport in the scrape-off layer of the Tore Supra tokamak
Evidence for a poloidally localized enhancement of radial transport in the scrape-off layer of the Tore Supra tokamak
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DOI：
10.1016/j.jnucmat.2007.01.195
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发表时间：
2007-06
影响因子：
3.1
通讯作者：
J. Gunn;C. Boucher;M. Dionne;I. Ďuran;V. Fuchs;T. Loarer;I. Nanobashvili;R. Pánek;J. Pascal;F. Saint-Laurent;J. Stöckel;T. Rompuy;R. Zagórski;J. Adamek;J. Bucalossi;R. Dejarnac;P. Devynck;P. Hertout;M. Hron;G. Lebrun;P. Moreau;F. Rimini;A. Sarkissian;G. Oost
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文献类型：
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作者：
J. Gunn;C. Boucher;M. Dionne;I. Ďuran;V. Fuchs;T. Loarer;I. Nanobashvili;R. Pánek;J. Pascal;F. Saint-Laurent;J. Stöckel;T. Rompuy;R. Zagórski;J. Adamek;J. Bucalossi;R. Dejarnac;P. Devynck;P. Hertout;M. Hron;G. Lebrun;P. Moreau;F. Rimini;A. Sarkissian;G. Oost
与许多l模x点分流托卡马克等离子体一样，在托卡马克Tore Supra的远刮脱层（SOL）中系统地观察到近音速平行流。通过将一个小圆形等离子体的接触点以不同的极向角移动到限制器上，测量了平行流的极向变化。由此产生的流动变化与径向输运的多向局部增强的存在是一致的，径向输运集中在靠近外侧中层的30°扇形上。如果等离子体接触点放置在板内限位器上，则溶胶膨胀以填充等离子体和板外限位器之间的所有空间，密度衰减长度在10到20cm之间。另一方面，如果接触点位于外侧限制器上，则局部等离子体外向通量被刮掉，并且SOL非常薄，衰变长度约为2-3cm。要解释这些结果，向外的径向传输必须比向内的强两个数量级。
Near-sonic parallel flows are systematically observed in the far scrape-off layer (SOL) of the limiter tokamak Tore Supra, as in many L-mode X-point divertor tokamak plasmas. The poloidal variation of the parallel flow has been measured by moving the contact point of a small circular plasma onto limiters at different poloidal angles. The resulting variations of flow are consistent with the existence of a poloidally localized enhancement of radial transport concentrated in a 30° sector near the outboard midplane. If the plasma contact point is placed on the inboard limiters, then the SOL expands to fill all the space between the plasma and the outboard limiters, with density decay lengths between 10 and 20cm. On the other hand, if the contact point lies on the outboard limiters, the localized plasma outflux is scraped off and the SOL is very thin with decay lengths around 2–3cm. The outboard radial transport would have to be about two orders of magnitude stronger than inboard to explain these results.