Periodic boundary model for fast magnetosonic wave propagation in the Elmo Bumpy Torus

Journal Article · Fri Jan 01 00:00:00 EST 1982 · Phys. Fluids; (United States)

DOI:https://doi.org/10.1063/1.863607· OSTI ID:5786151

Owens, T L; Mullen, J H; Huddleston, P L

Fast-wave propagation in a cylindrical magnetoplasma with periodic boundary conditions approximating those of the Elmo Bumpy Torus (EBT) is analyzed. Significant differences from straight cylinder models are found. For example, for the m = -1 poloidal mode and for model EBT-S (scale) parameters (i.e., n< or approx. =4 x 10/sup 12/ cm/sup -3/, B = 7--14 kG, and plasma radius approx. =15 cm), branches of the dispersion relation occur in bands of frequency separated by frequency intervals where no waves or only short wavelength modes occur, analogous to the stop band zones of free space periodic structures. Another difference is that the number of mode onsets which occur in a given frequency interval is larger than that found for straight cylinder problems. Other results indicate good wave-energy penetration for eigenmodes in both EBT-S and EBT-P (proof of principle). For EBT-P, with n = 3 x 10/sup 13/, B = 22.5 kG, and plasma radius = 17 cm, the wave fields peak strongly in the midplane of the mirror sectors near the minor axis.

• Research Organization: McDonnell Douglas Corporation, St. Louis, Missouri 63166
• OSTI ID: 5786151
• Journal Information: Phys. Fluids; (United States), Vol. 25:1
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ELMO BUMPY TORUS
MAGNETOACOUSTIC WAVES
BOUNDARY CONDITIONS
CYLINDRICAL CONFIGURATION
DISPERSION RELATIONS
MAGNETIZATION
MATHEMATICAL MODELS
PLASMA
WAVE PROPAGATION
CONFIGURATION
ELMO DEVICES
HYDROMAGNETIC WAVES
MAGNETIC MIRRORS
OPEN PLASMA DEVICES
THERMONUCLEAR DEVICES
700108* - Fusion Energy- Plasma Research- Wave Phenomena