Nonlinear coupling of lower hybrid grills and comparison with experimental data from ASDEX
Computations of the reflection coefficient based on the nonlinear lower hybrid (LH) coupling theory are presented and compared with measurements of the reflection coefficient of the ASDEX tokamak LH grill, where powers of up to 4 kW/cm2 have been launched. Such an LH power density modifies the electron density in front of the grill, as a result of ponderomotive forces. This changes the coupling and the power reflection coefficient. Comparison of computed reflection coefficients with experimentally observed ones suggests that heating of the plasma in front of the grill by the transmitted LH power has also to be taken into account, in order to explain the observed saturation of the growth of the reflection coefficient with power.
Bibliographic Reference: Report: IPP 4/243 EN (1990) 22 pp.
Availability: Available from Max-Planck-Institut für Plasmaphysik, 8046 Garching bei München (DE)
Record Number: 199011829 / Last updated on: 1994-12-02
Original language: en
Available languages: en