Author: Calvin T. SwiftPublisher:
ISBN:
Category : Electromagnetic waves
Languages : en
Pages : 68
Book Description
The problem of an electromagnetic wave obliquely incident upon a plasma slab is considered as a boundary-value problem by use of a self-consistent solution of the coupled linearized Vlasov and Maxwell equations. Power reflection, transmission, and absorption coefficients are derived under the assumption that all particles undergo specular reflection at the surfaces of the plasma slab. Although the analysis is valid for arbitrary slab thickness, computational results are presented for slabs which are thin when compared with a wavelength. The results show that a series of resonances occur which are attributed to the finite temperature of the plasma. The results further show that the resonances are Landau damped as the thermal velocity of the plasma electrons increases. It is shown that similar resonances can be predicted from the coupled linearized hydrodynamic Maxwell equations; however, as is well known, such a model does not predict Landau damping. The effects of a finite collision frequency are then included by means of a simple Bhatnagar-Gross-Krook (BGK) collision term. The numerical computations vividly indicate that the resonances undergo severe damping for extremely small ratios of the collision frequency to the signal frequency. Finally, the plasma capacitor problem is considered, and the results indicate that the longitudinal resonances have characteristics very similar to those of the plane-wave resonances.
Author: Calvin Thomas Swift
Author: 
Author: United States. Superintendent of Documents
Author: 
Author: 
Author: James R. Hansen
Author: 
Author: United States. Superintendent of Documents
Author: