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A study of sawtooth phenomena in TEXT: Comparison between theory and experiment

J.A. Snipes, K.W. Gentle1986年被引用 10Nuclear FusionIF 3出版社

Through a detailed analysis of soft-X-ray emissions from TEXT, comparisons were made between the observed phenomena and the often accepted theoretical model according to which a growing m = 1 mode is responsible for the sawtooth collapse. The sawtooth period was measured over a broad range of plasma conditions and compared with previously published theoretical and empirical scalings. The observed sawtooth period scaling was not found to depend strongly on the inversion radius, in contrast with previously published scalings. The time evolution of the often observed sinusoidal oscillations superimposed on sawteeth was analysed and compared with that predicted by Kadomtsev type reconnection sawtooth models. The sawtooth collapse is often in phase with the fall of the superimposed odd-m oscillation (assumed m = 1), but other cases show that the sawtooth collapse is independent of the phase of the m = 1 oscillations. Sawteeth in TEXT occur without clear m = 1 activity, and m = 1 oscillations occur before the crash, throughout the sawtooth period and after the crash, with the relative phase being independent of the collapse.

日本語訳

TEXTからの軟X線放射の詳細な解析を通して、観測された現象と、成長するm = 1モードが鋸歯状崩壊の原因であるとする広く受け入れられている理論モデルとの比較が行われた。鋸歯状周期は広範囲のプラズマ条件にわたって測定され、以前に発表された理論的および経験的スケーリングと比較された。観測された鋸歯状周期スケーリングは、以前に発表されたスケーリングとは対照的に、反転半径に強く依存しないことが見出された。鋸歯状波形に重畳してしばしば観測される正弦波振動の時間発展が解析され、Kadomtsev型リコネクション鋸歯状モデルによって予測されるものと比較された。鋸歯状崩壊は、重畳された奇数m振動(m = 1と仮定)の下降としばしば同位相であるが、他の場合では鋸歯状崩壊がm = 1振動の位相とは無関係であることが示される。TEXTにおける鋸歯状波形は、明確なm = 1活動なしに発生し、m = 1振動は崩壊前、鋸歯状周期全体、および崩壊後に発生し、その相対位相は崩壊とは無関係である。

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Sawtooth oscillationTEXT
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