One-dimensional ordinary-slow extraordinary-Bernstein mode conversion in the electron cyclotron range of frequencies

摘要

The ordinary-slow extraordinary-Bernstein (O-SX-B) mode conversion in the electron cyclotron range of frequencies (ECRF) is revisited in slab geometry.The analytical formula of the O-SX conversion efficiency by Mj(o)lhus is upgraded to include the magnetic field gradient,and the analytical expression of the SX-B conversion efficiency by Ram and Schultz is generalized for the case of oblique injection.Therefore,the conversion efficiency and optimal parallel refractive index for the whole O-SX-B conversion are obtained analytically and a shift of optimal parallel refractive index due to SX-FX loss is found.Full wave calculations are also presented to be compared with the analytical results.