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Transient transport barriers in ohmic and electron cyclotron heated RTPplasmas: relation with rational magnetic surfaces

G Gorini, P Mantica, G M D Hogeweij, J de Kloe, N J Lopes Cardozo, the RTP team2000年Plasma Physics and Controlled FusionIF 2.2出版社

Oblique pellet injection experiments have been performed in RTP ohmic andelectron cyclotron (EC) heated plasmas. Peripheral cooling induces a transientrise of the electron temperature (Te) in the plasma core, with theformation of a region of a high Te gradient (transient transportbarrier). The position of the barrier appears to be linked with the location oflow-order rational magnetic surfaces. For Ohmic and EC heated plasmas withresonance moderately off-axis, the Te rise is peaked in the plasmacentre and the footpoint of the barrier is located close to the q = 2 surface.For EC plasmas with far off-axis resonance, i.e. in plasmas exhibiting hollowTe profiles, the Te rise starts off-axis, near the innermost loworder rational surface (typically q = 3). It then propagates to the centre in aseemingly diffusive way.

日本語訳

斜めペレット入射実験がRTPオーミック加熱および電子サイクロトロン(EC)加熱プラズマにおいて実施された。周辺部の冷却は、プラズマコアにおける電子温度(Te)の一時的な上昇を誘発し、高いTe勾配の領域(過渡的輸送障壁)の形成を伴う。この障壁の位置は、低次の有理磁気面の位置と関連しているように見える。共鳴加熱がわずかに軸外であるオーミック加熱およびEC加熱プラズマでは、Teの上昇はプラズマ中心でピークに達し、障壁の足部はq=2面の近くに位置する。共鳴加熱が大きく軸外であるECプラズマ、すなわち中空Te分布を示すプラズマでは、Teの上昇は最も内側の低次有理磁気面(典型的にはq=3面)の近くの軸外で始まる。その後、それは拡散的な方法で中心に向かって伝播する。

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