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Abstract

Central ion heating of tokamak plasma by absorption of ion Bernstein waves (IBWs) at the 4th ion cyclotron harmonic of hydrogen is planned for a forthcoming experiment on FTU. However, a strong absorption layer corresponding to the 9th ion cyclotron harmonic of deuterium is located roughly halfway between the centre and the edge of the plasma column. Besides the linear ion cyclotron damping due to the minority species, a nonlinear physical mechanism underlies this absorption, nonlinear ion cyclotron damping due to the self-interaction of an IBW, located at 9/2 Omega(H). Analysis of the power absorption by this depletion channel shows that, in a pure hydrogen plasma, at the maximum injected power of 1.5 MW, this nonlinear mechanism can cause an absorption of up to 75 % of the total power.

Additional information

Authors: CARDINALI A, ENEA, Centro Ricerche Energia Frascati, Roma (IT);CESARIO R, ENEA, Centro Ricerche Energia Frascati, Roma (IT);DE MARCO F, ENEA, Centro Ricerche Energia Frascati, Roma (IT);CASTALDO C, ENEA, Centro Ricerche Energia Frascati, Roma (IT)
Bibliographic Reference: Paper presented: Theory of Fusion Plasmas, Varenna (IT), August 22-26, 1994
Availability: Available from (1) as Paper EN 38685 ORA
Record Number: 199411430 / Last updated on: 1994-12-06
Category: PUBLICATION
Original language: en
Available languages: en