首页|Towards explanation of 'broad' and 'narrow' ECRH regimes observed in the GDT experiment

Towards explanation of 'broad' and 'narrow' ECRH regimes observed in the GDT experiment

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In the experiments with combined ECRH and NBI plasma heating started at the GDT facility (Budker Institute) in 2014, two quite different scenarios of plasma discharges were realized. The first one was characterized by a broad radial distribution of the absorbed ECRH power and a stable plasma with improved energy confinement of fast ions, while in the other the electron temperature profile was highly peaked with local values of T_e ＞ 500 eV, but plasma was susceptible to low-frequency instabilities that had a net negative effect on confinement. We discuss the first theoretical explanation of these phenomena. Essentially different temperature profiles are considered as a result of self-consistent evolution in time after the ECRH is switched on. To explore this concept, we combine an advanced quasi-optical model for the calculation of microwave power absorption with a simple transport model describing electron energy balance in a gas-dynamic trap.

magnetic mirrorelectron cyclotron resonance heatingrf wavesquasi-optical beamgas-dynamic confinement

A.G. Shalashov、E.D. Gospodchikov、T.A. Khusainov、A.L. Solomakhin、D.V. Yakovlev、P.A. Bagryansky

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Institute of Applied Physics of the Russian Academy of Sciences, 46 Ulyanov str., 603950 Nizhny Novgorod, Russian Federation, Lobachevsky State University of Nizhny Novgorod, 23 Gagarin ave., 603950 Nizhny Novgorod, Russian Federation

Institute of Applied Physics of the Russian Academy of Sciences, 46 Ulyanov str., 603950 Nizhny Novgorod, Russian Federation

Institute of Applied Physics of the Russian Academy of Sciences, 46 Ulyanov str., 603950 Nizhny Novgorod, Russian Federation, Budker Institute of Nuclear Physics, 11 Lavrentiev ave., 630090 Novosibirsk, Russian Federation

Budker Institute of Nuclear Physics, 11 Lavrentiev ave., 630090 Novosibirsk, Russian Federation

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2022

10.1088/1741-4326/ac9293

Nuclear fusion

Nuclear fusion

SCI
ISSN：0029-5515
年,卷(期)：2022.62(12)
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