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Perturbations to deuterium and tritium distributions caused by close collisions with high-energy alpha-particles

F.S. Zaitsev, R.J. Akers, M.R. O'Brien2002年被引用 8Nuclear FusionIF 3出版社

The effect of nuclear elastic scattering (NES) of deuterium and tritium in close collisions with hot alpha-particles is considered. Calculations of the perturbed deuterium and tritium distribution functions are based on numerical solution of the three-dimensional trajectory averaged kinetic equation. The equation includes the full drift trajectory averaged Coulomb collision operator and the NES particle source. Modelling is carried out for parameters relevant to JET DT experiments and results of calculations are compared with typical measurements of NES deuterons. In addition, we evaluate the maximum achievable NES perturbation to the DT plasma. Finally, a potential opportunity for estimation of alpha-particle pitch-angle anisotropy, using measurements of NES perturbed deuterium or tritium distributions is discussed. We show that it is important to account for NES effects in order to accurately diagnose the alpha-particle distribution.

日本語訳

重水素およびトリチウムの、高温アルファ粒子との近接衝突における核弾性散乱(NES)の影響を考察する。重水素およびトリチウムの摂動分布関数の計算は、三次元ドリフト軌道平均化運動論方程式の数値解に基づく。この方程式には、完全なドリフト軌道平均化クーロン衝突演算子およびNES粒子源が含まれる。モデリングはJETのDT実験に相当するパラメータに対して実施され、計算結果は典型的なNES重水素測定値と比較される。さらに、DTプラズマに対するNES摂動の最大値を評価する。最後に、NESにより摂動を受けた重水素またはトリチウムの測定を用いた、アルファ粒子のピッチ角異方性推定の可能性について考察する。アルファ粒子分布を正確に診断するためには、NES効果を考慮することが重要であることを示す。

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