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Neutron emission profile measurements during the first tritium experiments at JET

F.B. Marcus, J.M. Adams, B. Balet, D.S. Bond, S.W. Conroy, P.J.A. Howarth, O.N. Jarvis, M.J. Loughlin, G.J. Sadler, P. Smeulders1993年被引用 31Nuclear FusionIF 3出版社

During a series of experiments with tritium (T) in deuterium (D) plasmas in the Joint European Torus (JET), the temporal evolution and the two dimensional (2-D) spatial profiles of the 2.5 and 14 MeV neutron emissivities from D-D and D-T fusion reactions were inferred from measurements with the JET neutron emission profile monitor. These experiments, involving triton production from D-D fusion, beam deposition and diffusion, D-T fusion, and tritium removed from wall tiles, were investigated in four plasma scenarios: (i) In high performance deuterium plasmas with deuterium neutral beam injection, the 14 MeV neutron emissivity due to triton burnup was observed. (ii) In discharges with 1% tritium beam injection, neutron emissivity ratios showed that approximately the same deposition profiles resulted from tritium as from deuterium beams. A thermalized tritium diffusion experiment was performed in which the T-D density ratio was found to be spatially constant across the plasma; in conjunction with similar particle source profiles, this indicates that deuterium and tritium have similar particle transport properties. (iii) In two high performance discharges for which two of the sixteen neutral beam sources operated with 100% tritium, the production rate of 14 MeV neutrons reached 6 × 1017 n.s-1 The alpha particle 2-D birth profile was directly inferred from the measured 14 MeV neutron emissivity profile. Both the axial 14 MeV neutron emissivity and the axial ion temperature saturated before the maximum global emission was reached. (iv) During the tritium cleanup phase, residual tritium entering the plasma produced a spatially constant ratio of tritium to deuterium, confirming the similarity of their particle transport properties

日本語訳

一連の重水素(D)プラズマ中でのトリチウム(T)を用いた実験を、欧州トーラス共同装置(JET)で行っている間に、D-DおよびD-T核融合反応から生じる2.5および14MeV中性子放出率の時間的発展と二次元(2次元)空間分布を、JET中性子放出分布モニタの測定から推定した。D-D核融合によるトリトン生成、ビーム堆積と拡散、D-T核融合、および壁タイルから除去されたトリチウムを含むこれらの実験を、4つのプラズマシナリオで調査した:(i)重水素中性粒子ビーム入射を伴う高性能重水素プラズマでは、トリトン燃焼による14MeV中性子放出率が観測された。(ii)1%トリチウムビーム入射の放電では、中性子放出率比から、重水素ビームとほぼ同じトリチウムの堆積分布が得られることが示された。熱化トリチウム拡散実験が行われ、T-D密度比はプラズマ全体で空間的に一定であることが判明した。同様の粒子源分布と併せると、これは重水素とトリチウムが同様の粒子輸送特性を持つことを示している。(iii)16基の中性粒子ビーム源のうち2基が100%トリチウムで動作した2回の高性能放電では、14MeV中性子の生成率は6×10¹⁷ n・s⁻¹に達した。アルファ粒子の2次元生成分布は、測定された14MeV中性子放出率分布から直接推定された。軸方向の14MeV中性子放出率と軸方向のイオン温度はともに、最大の全体放出率に達する前に飽和した。(iv)トリチウム除去段階では、プラズマに入射した残留トリチウムが空間的に一定のトリチウム対重水素比を生み出し、それらの粒子輸送特性の類似性を裏付けた。

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JETTritiumNeutron emission
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