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Study of ICRH scenarios for thermal ion heating in JET D–T plasmas

Ye.O. Kazakov, V.G. Kiptily, S.E. Sharapov, D. Van Eester, JET EFDA Contributors2012年被引用 13Nuclear FusionIF 3出版社

Various ion cyclotron resonance heating (ICRH) scenarios relevant for the D–T phase of the JET tokamak are studied. Recent ICRH experiments in JET (3He)–D and (3He)–H plasmas confirmed the possibility of electron heating enhancement in the mode conversion (MC) regime due to the constructive interference of the reflected fast waves. Such a heating enhancement in D–T plasma is investigated first for JET-like conditions for both dipole and +π/2 ICRH antenna phasing, and for T concentration varied from 0% to 100%. It is shown that most of the MC scenarios at comparable concentrations of D and T species suffer from a parasitic absorption by fusion-born alpha-particles and NBI-produced fast ions whereas the impact of such fast ions in the minority heating (MH) ICRH schemes is substantially smaller. A possibility of ion heating enhancement due to the interference effect is shown for the MH scenarios. It is found that thermal ion heating becomes dominant in tritium-rich plasmas with T concentration ∼80%. The efficiency of ion heating in such a scenario is compared with the alternative 3He minority ICRH scenario in D : T = 50 : 50 plasmas.

日本語訳

JETトカマクのD–Tフェーズに関連する様々なイオンサイクロトロン共鳴加熱(ICRH)シナリオを研究する。JET(3He)–Dおよび(3He)–Hプラズマにおける最近のICRH実験は、反射高速波の干渉によるモード変換(MC)領域での電子加熱増強の可能性を確認した。このようなD–Tプラズマにおける加熱増強は、まずJET類似条件において、ダイポールおよび+π/2のICRHアンテナ位相の両方について、またT濃度を0%から100%まで変化させて調査される。DおよびT種の濃度が同等である場合、ほとんどのMCシナリオは核融合生成アルファ粒子およびNBI生成高速粒子による寄生吸収を受けることが示される一方、マイノリティ加熱(MH)ICRHスキームにおけるそのような高速粒子の影響は substantially 小さい。干渉効果によるイオン加熱増強の可能性がMHシナリオについて示される。Tリッチプラズマ(T濃度約80%)では熱イオン加熱が支配的になることが見出される。このようなシナリオにおけるイオン加熱効率は、D:T = 50:50プラズマにおける代替的な3HeマイノリティICRHシナリオと比較される。

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