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Charge-exchange measurements of d-d triton distribution functions in high-power neutral beam heating on JT-60U

F V Tchernychev, Y Kusama, M Nemoto, A Morioka, K Tobita, S Ishida1999年Plasma Physics and Controlled FusionIF 2.2出版社

We present the first results of the fusion triton measurements in JT-60U using the MeV energy range neutral particle analyser (NPA). An energy distribution of slowing-down fusion tritons has been obtained during the experiments of high-power neutral beam injection (NBI). We associate a dominant mechanism of triton neutralization with charge-exchange (CX) on the plasma residual neutral deuterium and on the hydrogen-like carbon impurity ions. To determine a contribution of these processes in triton neutralization the simplified steady-state balance of carbon impurity ions is considered. The spectrum of slowing-down triton is modelled using the analytical solution of the simplified zero-dimensional Fokker-Planck equation. A good agreement between the experiment with the model is demonstrated.

日本語訳

我々は、MeVエネルギー範囲の中性粒子分析器(NPA)を用いたJT-60Uにおける核融合トリトン測定の最初の結果を提示する。高パワー中性粒子ビーム入射(NBI)の実験中に、減速中の核融合トリトンのエネルギー分布が得られた。我々は、トリトン中和の主要なメカニズムを、プラズマ残留中性重水素および水素様炭素不純物イオン上の荷電交換(CX)と関連付ける。トリトン中和におけるこれらのプロセスの寄与を決定するために、炭素不純物イオンの簡略化された定常状態バランスが考慮される。減速トリトンのスペクトルは、簡略化されたゼロ次元フォッカー・プランク方程式の解析解を用いてモデル化される。実験とモデルの間の良好な一致が実証される。

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Neutral beamNeutral beam injectionJT-60U
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