Detection of alpha heating in JET-ILW DT plasmas by a study of the electron temperature response to ICRH modulation

P. Mantica, F. Auriemma, I. Casiraghi, D. Gallart, K. Kirov, E. Lerche, A. Salmi, A. Dal Molin, E. Delabie, J. Eriksson2024年8月Nuclear FusionIF 3 出版社

In the JET DTE2 campaign a new method was successfully tested to detect the heating of bulk electrons by α-particles, using the dynamic response of the electron temperature Te to the modulation of ion cyclotron resonance heating (ICRH). A fundamental deuterium (D) ICRH scheme was applied to a tritium-rich hybrid plasma with D-neutral beam injection (NBI). The modulation of the ion temperature Ti and of the ICRH accelerated deuterons leads to modulated α-heating with a large delay with respect to other modulated electron heating terms. A significant phase delay of ∼40° is measured between central Te and Ti, which can only be explained by α-particle heating. Integrated modelling using different models for ICRH absorption and ICRH/NBI interaction reproduces the effect qualitatively. Best agreement with experiment is obtained with the European Transport Solver/Heating and Current Drive workflow.

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ENThis paper is of interest to fusion researchers studying alpha-particle heating and plasma heating mechanisms in tokamak experiments. It provides a novel diagnostic technique that can be used to study the impact of alpha-particle heating on the plasma.#JET #DT_plasma #alpha_heating #ICRH_modulation #electron_temperature_response

This paper describes a new method to detect the heating of electrons by alpha particles in JET-ILW DT plasmas. The method uses the dynamic response of the electron temperature to the modulation of ion cyclotron resonance heating (ICRH). The modulation of ion temperature and ICRH-accelerated deuterons leads to modulated alpha-heating, which can be detected by the phase delay between central electron and ion temperatures.

この論文では、JET DTE2キャンペーンで、アルファ粒子によるバルク電子の加熱を検出する新しい方法が成功裏に試験されました。ICRH変調応答の解析により、中心部の電子温度とイオン温度に約40度の位相差が観測され、これはアルファ粒子加熱によって説明できます。統合モデリングにより、実験結果を定性的に再現できました。