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Study of impurity transport in ohmically and neutral beam heated divertor discharges in JT-60

Y. Koide, T. Hirayama, T. Sugie, A. Sakasai, H. Kubo, N. Akaoka, T. Nishitani, K. Nagashima, H. Shirai, H. Takeuchi1988年被引用 6Nuclear FusionIF 3出版社

The impurity transport characteristics of ohmically and neutral beam heated diverted plasmas in JT-60 have been studied. In sawtoothfree, ohmically heated plasmas with Ip = 1.5 MA, e = (2−3) × 1019 m−3, q(a) = 3.2, no radiation buildup is observed. The temporal evolution of injected titanium has been measured by VUV and X-ray crystal spectrometers and PIN diodes. The spectral lines of Ti XX (259.3 Å) and Ti XXI (2.6097 Å) are compared with one-dimensional diffusive/convective impurity transport calculations. The transport calculations for Ohmic discharges with Ip = 1.5−2 MA, e = (1–3) × 1019 m–3, q(a) = 3−3.7, show that DA =(1−2) m2⋅s−1 and that the inward convective velocity is small. In neutral beam heated plasmas with Ip = 1.5 MA, e = 4 × 1019 m–3, q(a)= 3.6, Pb = 8 MW, no difference is observed in the global time evolution of the Ti XXI line emissions between co- and counter-injected discharges. The experimental observations are well represented by choosing DA = (1–2) m2⋅s−1 and a small inward velocity.

日本語訳

JT-60におけるオーミック加熱および中性粒子ビーム加熱ダイバータプラズマ中の不純物輸送特性を研究した。鋸歯状振動のないオーミック加熱プラズマ(Ip = 1.5 MA、e = (2−3) × 1019 m−3、q(a) = 3.5)では、放射の蓄積は観測されなかった。注入されたチタンの時間発展を、VUV分光器、X線結晶分光器、およびPINダイオードを用いて測定した。Ti XX(259.3 Å)およびTi XXI(2.6097 Å)のスペクトル線を、一次元拡散・対流不純物輸送計算と比較した。Ip = 1.5−2 MA、e = (1–3) × 1019 m–3、q(a) = 3.5−3.7のオーミック放電に対する輸送計算では、DA = (1−2) m2⋅s−1かつ内向き対流速度が小さい場合に実験結果と一致した。Ip = 1.5 MA、e = 4 × 1019 m–3、q(a) = 3.5、Pb = 8 MWの中性粒子ビーム加熱プラズマでは、同方向および逆方向入射放電間でTi XXIスペクトル線の全体的な時間発展に差異は観測されなかった。実験観測結果は、DA = (1–2) m2⋅s−1および小さな内向き速度を選択することで良好に再現された。

装置

jt-60sa高精度(タイトル一致)

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DivertorImpurityNeutral beamNeutral beam injectionOhmic heatingImpurity transportJT-60
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