Power Flow and Gap Coupling to Slow Wave Plasma Modes

Abstract

The interaction impedance for the slow wave plasma modes of Trivelpiece and Gould is obtained for a coaxial system of plasma column, surrounding dielectric and conducting surface. The theory presented includes a finite axial magnetic field. Calculations are presented for the special case of no static magnetic field for the so-called surface wave interaction impedance versus βa. Coupling to the slow wave plasma modes by a known electric field across a gap in the conducting surface at the dielectric surface is analyzed for the coaxial plasma system including a static axial magnetic field. Such an analysis follows that of Sensiper. This results in an impedance as seen by the cavity gap. Calculations are presented for the special case of no static magnetic field.