Variational description of lower hybrid wave propagation and absorption in tokamaks
A variational approach to a global solution of the lower hybrid wave propagation and absorption in tokamaks is presented. It is restricted to current drive or electron heating applications (ie when lower hybrid resonance does not exist), and is based on the use of trial functions which are locally solutions of the homogeneous problem ("eikonal trial functions"). Results in circular cylindrical geometry are presented, for which radial power deposition profiles have been calculated. The influence of the main plasma and wave parameters has been investigated, and in particular the effect of the toroidal wave number on the power deposition, and also on the wave accessibility and "whispering gallery" phenomena. The radial extension and shape of the power deposition near the reflection layer of inaccessible waves (caustics) are displayed.
Bibliographic Reference: Paper presented: 16th European Conference on Controlled Fusion and Plasma Physics, Venezia (IT), March 13-17, 1989
Availability: Available from (1) as Paper EN 34463 ORA
Record Number: 198910652 / Last updated on: 1994-12-01
Original language: en
Available languages: en