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Isotope effect in turbulent transport in high density FT-2 tokamak discharges

D.V. Kouprienko, A.D. Gurchenko, E.Z. Gusakov, A.B. Altukhov, L.G. Askinazi, A.A. Belokurov, V.V. Dyachenko, L.A. Esipov, V.A. Ivanov, O.A. Kaledina2022年被引用 1Nuclear FusionIF 3出版社

A detailed study of the general transport properties of the FT-2 tokamak shows significant isotopic difference in ohmically heated quasi-stationary plasma in high density regimes 〈ne〉 ≈ (6–9) × 1019 m−3. For deuterium, the signatures of a transition to the H-mode are found at a plasma density exceeding a certain value, while hydrogen plasma remains in L-mode in all comparable discharge scenarios. The origin of this isotopic discrepancy is studied both with energy transport analysis and direct turbulence and plasma velocity measurements performed with Langmuir probes and microwave diagnostics. A special, more complicated dynamic experimental series with current ramp up, performed in these high density regimes, demonstrated the stability and robustness of an improved energy confinement in deuterium, whereas a comparable confinement improvement in hydrogen plasma was observed.

日本語訳

FT-2トカマクの一般輸送特性の詳細な研究により、高密度領域〈ne〉≈(6–9)×10^19 m^-3におけるオーミック加熱準定常プラズマにおいて、顕著な同位体差が示された。重水素では、特定の密度を超えるとHモード遷移の兆候が見られる一方、水素では同等のすべての放電シナリオにおいてLモードのままである。この同位体差は、エネルギー輸送解析と、ラングミュアプローブおよびマイクロ波診断を用いた直接的なプラズマ流速測定の両方によって研究された。これらの高密度領域で実施された、より複雑な電流ランプアップを伴う特別な動的実験シリーズは、重水素における改善されたエネルギー閉じ込めの安定性と堅牢性を示した一方、水素プラズマでは同等の閉じ込め改善は観測されたものの、その特性は異なっていた。

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Turbulent transport
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