EXPERIMENTAL STUDY OF LOW FREQUENCY SURFACE WAVES IN A RESISTIVE PLASMA COLUMN
Low frequency (omega << omega-ci), non-axisymmetric (m + z < +- 1) surface waves have been observed in a low temperature hydrogen plasma. Good agreement is found between the values of Re(k-//EL) measured in the experiment and those calculated using a theory describing wave propagation in a uniform, resistive plasma column. However, the waves are observed to be much more strongly damped than is predicted from this theory. A possible explanation is that the presence of density and temperature gradients leads to enhanced damping due either to the larger resistivity in the vicinity of the plasma boundary, or to the effect of the spatial Alfven resonance. A simple non-uniform plasma theory shows that, even for the low temperature plasma considered, the wave damping due to the spatial Alfven resonance should be much greater than that calculated from the uniform plasma theory. A much closer agreement is obtained by comparing the experimental values of wave damping with those calculated from the non-uniform theory.
Bibliographic Reference: WRITE TO CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE, 21, AVENUE DES BAINS, CH-1007 LAUSANNE (SWITZERLAND), MENTIONING REPORT LRP 248/84, 1984
Record Number: 1989123035400 / Last updated on: 1987-01-01
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