Nonlinear electromagnetic wave transformation in a longitudinally magnetized plasma waveguide

Abstract

This paper deals with an experimental study of electromagnetic wave transformation in a longitudinally magnetized plasma waveguide (LMG plasma column). We have obtained the line averaged plasma density dependence with the incident power launched into the plasma. The results were carried out in argon. The paper presents evidence of anomalous absorption of an intense right hand circulary polarized wave (RHCP wave) at high magnetic fields.

Coupling of a Trivelpiece-Gould wave to a new type of electromagnetic wave observed around the electron cyclotron frequency in an inhomogeneous plasma column

“…We stress that the electromagnetic wave excitation mechanism can hardly be due to a direct wave-wave coupling, since a wavenumber matching is not possible in any region of the interaction chamber, as the two waves have very different wavelengths. Further, higher order wave excitation based on echo-like phenomenology (BAKER andYONG. 1968 : YONG andBAKER, 1969) could hardly result in such a large amplitude EM wave.…”

“…Further, higher order wave excitation based on echo-like phenomenology (BAKER andYONG. 1968 : YONG andBAKER, 1969) could hardly result in such a large amplitude EM wave.…”

“…THE STUDY of the physical mechanisms that lead to wave transformation in plasmas has recently acquired an ever increasing importance in scientific research (GOLANT and PILIYA, 1972;VEGAS et al, 1984;SMITH et al, 1984;STEFAN and KRALL, 1985). In this context, special attention has been paid to the conversion of electromagnetic waves into electrostatic waves (STENZEL et al, 1974;SHARMA and KUMAR, 1984), and vice versa (LEMBEGE and JONES, 1982;SALEEM et al, 1985).…”

Experimental verification of cyclotron absorption of polarized electromagnetic waves in a plasma waveguide

“…7 The result is that, in this case, there may be some absorption of electromagnetic waves with LHCP polarization for magnetic fields that satisfy the condition (tJ = Wee' 8 The absorption in this case occurs via a two-stage process with two different thresholds, On the other hand, Kuckes 9 demonstrated that a RHCP wave is essentially completely absorbed under electron cyclotron resonance conditions. However, no systematic study has been made of the effectiveness of the absorption mechanism as a function of the polarization of the incident waves, taking into account the propagation theory of waves in cold plasmas which establishes, for these resonance conditions, a relation between the transformation of the waves and the collisional nature of the plasma.…”