Cyclotron waves in a bounded magnetoplasma

Journal Article · Tue Jan 01 04:00:00 EST 1980 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.327417· OSTI ID:5753059

Das, S K; Basu, J

The paper presents a study of the cyclotron waves in a plasma column enclosed in a conducting cylinder and placed in an axial static magnetic field. The cutoff frequencies of the waves are investigated with special reference to the role of the plasma radius a in the wave propagation. The cyclotron modes discussed cover all the possible types, namely, circularly symmetric C/sub o/m modes and asymmetric C/sub n/m modes with n> or =1, each C/sub n/m mode being split into two, designated as C/sup -//sub n/m and C/sup +//sub n/m modes, corresponding to two different polarizations of the field components. The upper and lower limits of the cutoff frequencies of the various modes as a tends to zero and infinity, respectively, are derived. It is found that cyclotron modes can broadly be divided into the following two categories: (1) C/sup +//sub n/1 modes, the limiting cutoff frequencies of which are the electron cyclotron frequency ..omega../sub ce/ and lower hybrid frequency ..omega../sub lh/, and (2) modes other than C/sup +//sub n/1 modes, the limiting frequencies being the upper hydrid frequency ..omega../sub uh/ and a frequency ..omega../sub 0/ which is a function of electron and ion plasma frequencies, ..omega../sub pe/ and ..omega../sub ..pi../, as well as electron and ion cyclotron frequencies, ..omega../sub ce/ and ..omega../sub ci/. The modes belonging to the first category represent, in all cases, forward waves while those of the second category may represent backward or forward waves, depending essentially on a if ..omega../sub pe/ and ..omega../sub ce/ are kept constant. The critical radii at which the change takes place for the lowest-order modes are derived. The effect of plasma ions on the propagation of the C/sup +//sub n/1 modes is found to be considerable if a is sufficiently large. For other modes the effect can be considerable if both a and ..omega../sub ce/ have sufficiently high values.

• Research Organization: S.R.S. Vidyamahapith, Kamarpukur, Hooghly, West Bengal, India
• OSTI ID: 5753059
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 51:1; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700108* -- Fusion Energy-- Plasma Research-- Wave Phenomena
ASYMMETRY
BREMSSTRAHLUNG
CONFIGURATION
CYCLOTRON RADIATION
CYLINDRICAL CONFIGURATION
ELECTROMAGNETIC RADIATION
MAGNETIC FIELDS
MATHEMATICAL MODELS
PLASMA
POLARIZATION
RADIATIONS
SYMMETRY