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Ignition analysis for burn control and diagnostic developments in ITER

O. Mitarai, K. Muraoka1997年被引用 19Nuclear FusionIF 3出版社

The temporal evolutions of the operating point during the ignition access and ignited operation phases are analysed on the basis of zero dimensional (O-D) equations in order to clarify the requirements for safe control of ignited operation and for the development of diagnostic systems in ITER. A stable and safe method of reaching the ignited operating point is identified as the `higher temperature access' method, being compatible with the H mode power threshold constraints. It is found that the ignition boundary can be experimentally determined by a `thermonuclear oscillation' of the operating point without knowing the power balance equation. On the other hand, the ignition boundary determined by the power balance equation has a larger error bar depending on the accuracy of the diagnostic system. The plasma waveform response to sudden changes in the various plasma parameters during ignited operation is also calculated, and fusion power regulation is demonstrated by feedback control of the fuelling and auxiliary heating power

日本語訳

点火達成および点火運転中の動作点の時間発展を、零次元(0次元)方程式に基づいて解析し、ITERにおける点火運転の安全な制御と診断システム開発のための要件を明らかにする。点火動作点へ到達する安全かつ確実な方法として、「高温到達法」が特定され、これはHモード出力閾値の制約と両立する。動作点を「熱核振動」させることにより、出力バランス方程式を知ることなく実験的に点火境界を決定できることが見出された。一方、出力バランス方程式から決定される点火境界は、診断システムの精度に依存してより大きな誤差を伴う。点火運転中の種々のプラズマパラメータの急激な変化に対するプラズマ波形の応答も計算され、燃料供給と補助加熱のフィードバック制御による核融合出力の調整が実証される。

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