Analysis of ICRF coupling and heating in CIT and JET

We study the effect of an L- to H-mode transition in a tokamak on the coupling of fast wave launchers in the Ion Cyclotron Range of Frequencies. Waveguides or coils can readily be accommodated within the formalism. We calculate the waveguide or coil reflection coefficient for conditions appropriate to CIT. It is concluded that an L- to H-mode transition can impose substantial loading variations on the launcher system which can be handled by a fast reponse matching system similar to that successfully used on JET. The subject of linear wave propagation and its associated power conservation in a slab geometry for waves in the ion cyclotron range of frequencies is treated. The development is applicable to instances where full-wave effects such as reflection, mode-conversion, and absorption may be important. The local power conservation relation follows from a definition of local power absorption and a companion general expression for kinetic flux based on basic principles. These expressions are evaluated to second order in a numerical code, and results are presented for several cases. For fundamental minority 3He and second harmonic absorption in machines comparable to JET, fast wave launching in CIT is discussed. (author) 5 refs., 2 figs., 1 tab