Confinement in electron heated plasmas in Wendelstein 7-X and ASDEX Upgrade; the necessity to control turbulent transport

Beurskens M.N.A.; Angioni C.; Bozhenkov S. A.Ford O.Kiefer C.Xanthopoulos P.Turkin Y.Alcusón J.A.Baehner J.P.Beidler C.Birkenmeier G.Fable E.Fuchert G.Geiger B.Grulke O.Hirsch M.Jakubowski M.Laqua H.P.Langenberg A.Lazerson S.Pablant N.Reisner M.Schneider P.Scott E.R.Stange T.von Stechow A.Stober J.Stroth U.Wegner Th.Weir G.Zhang D.Zocco A.Wolf R.C.Zohm H.the W7-X Teamthe ASDEX Upgrade Teamthe EUROfusion MST1 Team

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Confinement in electron heated plasmas in Wendelstein 7-X and ASDEX Upgrade; the necessity to control turbulent transport

机译：Confinement in electron heated plasmas in Wendelstein 7-X and ASDEX Upgrade; the necessity to control turbulent transport

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Abstract In electron (cyclotron) heated plasmas, in both ASDEX Upgrade (L-mode) and Wendelstein 7-X, clamping of the ion temperature occurs at T i ∼ 1.5 keV independent of magnetic configuration. The ions in such plasmas are heated through the energy exchange power as ne2(Te−Ti)/Te3/2 , which offers a broad ion heating profile, similar to that offered by alpha heating in future thermonuclear fusion reactors. However, the predominant electron heating may put an additional constraint on the ion heat transport, as the ratio T e/T i > 1 can exacerbates ITG/TEM core turbulence. Therefore, in practical terms the strongly ‘stiff’ core transport translates into T i-clamping in electron heated plasmas. Due to this clamping, electron heated L-mode scenarios, with standard gas fueling, in either tokamaks or stellarators may struggle to reach high normalized ion temperature gradients required in a compact fusion reactor. The comparison shows that core heat transport in neoclassically optimized stellarators is driven by the same mechanisms as in tokamaks. The absence of a strong H-mode temperature edge pedestal in stellarators, sofar (which, like in tokamaks, could lift the clamped temperature-gradients in the core), puts a strong requirement on reliable and sustainable core turbulence suppression techniques in stellarators.

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《Nuclear fusion》 |2022年第1期|共12页
作者
Beurskens M.N.A.; Angioni C.; Bozhenkov S. A.Ford O.Kiefer C.Xanthopoulos P.Turkin Y.Alcusón J.A.Baehner J.P.Beidler C.Birkenmeier G.Fable E.Fuchert G.Geiger B.Grulke O.Hirsch M.Jakubowski M.Laqua H.P.Langenberg A.Lazerson S.Pablant N.Reisner M.Schneider P.Scott E.R.Stange T.von Stechow A.Stober J.Stroth U.Wegner Th.Weir G.Zhang D.Zocco A.Wolf R.C.Zohm H.the W7-X Teamthe ASDEX Upgrade Teamthe EUROfusion MST1 Team;
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作者单位

Max-Planck Institut für Plasmaphysik;

University of Wisconsin-Madison;

Princeton Plasma Physics Laboratory;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种英语
中图分类原子核物理学、高能物理学;
关键词
stellarator transport; turbulent transport; electron heating; ion temperature clamping;

Confinement in electron heated plasmas in Wendelstein 7-X and ASDEX Upgrade; the necessity to control turbulent transport

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