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Identification of ion cyclotron emission from fusion alpha particles during JET deuterium-tritium experiments

G A Cottrell, V P Bhatnagar, O da Costa, R O Dendy, A Edwards, J Jacquinot, M F F Nave, M Schmid, A Sibley, P Smeulders1992年Plasma Physics and Controlled FusionIF 2.2出版社

Summary form only given, as follows. In the course of the preliminary tritium experiment (PTE) in JET, where combined D and T neutral beam injection generated a DT fusion power of 1.7 MW, ion cyclotron emission (ICE) in the frequency range up to 180 MHz was measured using an ICRF heating antenna as probe. The ICE spectrum showed a number of superthermal narrow, equally spaced emission lines which correspond to deuteron or alpha -particle ion cyclotron harmonics at the outer mid-plane edge (major radius R approximately 4 m). DD and DT power spectra are similar in form, and show split lines which, above approximately 100 MHz, merge into a continuum. With tritium injection, the ICE power increased by a factor comparable to the increase of neutron flux, indicating that 3.5 MeV fusion alpha -particles provide the free energy for generating ICE. The ICE power increases almost linearly with neutron flux over a range of six decades. The evolution of the ICE follows the rise of the neutron flux, but is delayed by a time comparable with the slowing-down time of the alpha -particles. The ICE intensity is anti-correlated with large amplitude edge-localized modes.

日本語訳

要約のみ記載。JETにおける予備トリチウム実験(PTE)の過程で、DおよびT中性粒子ビーム入射の組み合わせにより1.7 MWのDT核融合出力が生成され、その際にICRF加熱アンテナをプローブとして用いて、最大180 MHzの周波数範囲におけるイオンサイクロトロン放射(ICE)が測定された。ICEスペクトルは、外側中平面端部(主半径R約4 m)における重陽子またはアルファ粒子のイオンサイクロトロン高調波に対応する、多数の超熱的で等間隔の輝線を示した。DDおよびDTパワースペクトルは形状が類似しており、約100 MHzを超えると連続スペクトルに融合する分裂線を示した。トリチウム入射により、ICEパワーは中性子束の増加に匹敵する係数で増加し、3.5 MeVの核融合アルファ粒子がICEを生成するための自由エネルギーを提供していることを示した。ICEパワーは、6桁の範囲にわたって中性子束とほぼ線形に増加する。ICEの時間発展は中性子束の上昇に追従するが、アルファ粒子の減速時間に匹敵する時間だけ遅延する。ICE強度は、大振幅の周辺局在モードと逆相関を示す。

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JETTritiumDeuteriumDeuterium-tritiumElectron cyclotron emissionAlpha particlesIon cyclotron emission
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