Threshold of parametric decay instability accompanying electron Bernstein wave heating in spherical tokamaks

2004/10/21 by E. Z. Gusakov, Evgeniy Gusakov, Gusakov, Evgeniy +2
Earth and Planetary Sciences · Physics and Astronomy · #FOS: Physical sciences #Ionosphere and magnetosphere dynamics #Magnetic confinement fusion research #Meteorological Phenomena and Simulations #Plasma Physics (physics.plasm-ph) #physics.plasm-ph

paper · pdf · doi:10.48550/arxiv.physics/0410190

12th International Congress on Plasma Physics, 25-29 October 2004, Nice (France)

openalex publication_date 2004/10/21 · arxiv created 2005/04/16 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The parametric instability of upper hybrid wave decay into back scattered upper hybrid wave and lower hybrid wave is considered for conditions of inhomogeneous plasma of spherical tokamaks. The possibility of absolute instability is demonstrated and the corresponding threshold is determined. It is shown that the threshold power increases with pump frequency and electron temperature. Threshold power is estimated for typical parameters of experiment in MAST tokamak. It is shown that in this case parametrical reflection arises, if probing power exceeds 90W/cm², which gives 30 kW for a beam of 10 cm radius.

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