Experimental evidence and theory for the interaction of superthermal electrons with the MHD modes during ECRH

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Title

Experimental evidence and theory for the interaction of superthermal electrons with the MHD modes during ECRH (EN)

Creator

Lazaros, A (EN)

Type

journalArticle (EN)

Partial document
Publication in journal (EN)

Article
Scientific article (EN)

Issued

2014-03-01T01:16:34Z

2001 (EN)

Year

2001 (EN)

Description

The interaction of Electron Cyclotron Resonant Heating (ECRH) with the m/n = 2/1 magnetohydrodynamic (MHD) mode, which was observed in toroidal plasmas, is attributed to the superthermal electrons which are produced on the EC resonance by the ECRH. Superthermal electrons diffusing across the q = 2 surface, exchange power with the m/n = 2/1 MHD mode which is either suppressed or enhanced. When the EC resonance is outside the rational surface the mode is always suppressed. When the EC resonance is inside the rational surface, modes with a large amplitude are enhanced while modes with a small amplitude are suppressed. It is also shown quantitatively that a superthermal electron population, three orders of magnitude below the thermal electron density, would be sufficient to suppress the mode and an experiment is proposed for the confirmation of the theory. (C) 2001 Elsevier Science B.V. All rights reserved. (EN)

Scientific field

Nuclear Science & Technology (EN)

Engineering and Technology ▶ Mechanical Engineering
Nuclear Energy and Engineering (EN)

Subject

Superthermal electrons (EN)

Magnetohydrodynamics (EN)

Electron cyclotron resonance (EN)

Thermal electrons (EN)

Electron transitions (EN)

Plasmas (EN)

Rational surface (EN)

Journal