Ion Bernstein wave excitation and propagat on via finite ion-Larmor-radius mode-transformation are invest''gated theore tically and experimentally. It is shown that in the ion cyclo tron range of frequencies m < 4:-

We investigate the ion cyclotron harmonic damping effects on slow and East waves in the lower hybrid frequency range for tokamak reactor parameters. Inclusion of the higher order terms in the *iot plasma dielectric tensor introduces ion cyclotron harmonic damping; these terms also contribute to the real part of the dispersion relation and affect the wave trajectories. However, wave absorption by 15 keV deuterium and tritium ions can be avoided by choosing the slow wave frequency above the lower hybrid frequency and the fast wave frequency below the lower hybrid frequency. But preliminary estimates show that energetic alpha particles tend to absorb both the slow and the fast waves. This absorption may become a serious obstacle for fusion-reactor current drive in the lower hybrid frequency range.

Parametric excitation of ion Bernstein waves is observed with an ICRF fast wave induction loop antenna in the ion oycl< 1 frequency range (u 2Si i ~ 4 "i'-Important features of the decay process are investigated and discussed.

DE85 005352 Parasitic excitation of ion Bernstein waves is observed from a Faraday shielded fast wave loop antenna in the ion cyclotron frequency range. Local analysis of the Vlasov-Maxwell equations demonstrates the role of plasma density gradient in the coupling process. The effects of plasma density and of parallel wave number on the excitation process are investigated. DrSCLAIMER This report was prepared as an account or work sr.inrorcd by an agency of the United Stales Government. Neither the United Stales Government nor any agency therccr.

• nCTntBHma OF was nacumn » MBgwn NOTICE This report was prepared as an account of work sponsored by the United States Govatnment. Neither the tfnited States nor the United States Department of Energy, nor any of their employees, nor any of their contractors, subcontractors, or their employees, nakea any warranty, express or implied, or aaajmes eny legal liability or responsibility for the accuracy, completeness or usefulness of any infortaation, apparatus, product or process disclosed, or represents that Its use would not infringe privately owned rights.