Journal
PLASMA PHYSICS REPORTS
Volume 46, Issue 12, Pages 1144-1149Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/S1063780X20120041
Keywords
stellarator; ECR plasma heating; flat electron temperature profile; dip-shaped electron density profile; electron Bernstein wave
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Funding
- Russian Foundation for Basic Research [18-02-00609]
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The shape is analyzed of the electron temperature profiles measured in experiments on the axial ECR heating at the L-2M stellarator at different densities and heating powers. It is ascertained that when the reduced ECR heating power exceeds some threshold value, the electron temperature profiles become broadened and flat in the core region of the plasma column. The correlation is revealed between the appearances of the flat temperature profiles and the density profiles with a dip in the axial region (the dip-shaped profiles) occurring as a result of the density pump-out effect. It is concluded that the appearance of the dip-shaped density profiles in the plasma results in a change in the mechanism of microwave radiation absorption. Hypothetically, the cyclotron absorption of the electron Bernstein waves becomes the dominant mechanism for the microwave radiation absorption that, in turn, results in the formation of the broad and flat (in the core region) electron temperature profiles.
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