Cross field diffusion and fluctuation spectra in a levitated octupole in the presence of a toroidal field

Technical Report · Sat Nov 01 04:00:00 EST 1980

DOI:https://doi.org/10.2172/6729177· OSTI ID:6729177

Ehrhardt, A. B.; Garner, H. R.; Navratil, G. A.; Post, R. S.

The diffusion coefficient, D/sub perpendicular to/, for a collisionless hydrogen plasma was measured in the Levitated Octupole when a weak toroidal field was added. A 20-fold decrease in the anomalous diffusion was observed with B/sub T//B/sub P/ approx. 0.1. Since the plasma is collisionless locally trapped particles in the poloidal field mirrors allows the convective cell activity (f < 600 Hz) to persist even when toroidal field was added. A shift in the k/sub perpendicular to/ spectrum to shorter wavelengths was noted. Measurements and calculations indicate that the higher frequency portion of the spectrum (f > 600 Hz) cannot be responsible for the observed diffusion.

• Research Organization: Wisconsin Univ., Madison (USA)
• Sponsoring Organization: USDOE
• DOE Contract Number: AS02-76ET53051
• OSTI ID: 6729177
• Report Number(s): DOE/ET/53051-14
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
&amp; Production
CLOSED CONFIGURATIONS
COLLISIONLESS PLASMA
CONVECTIVE INSTABILITIES
ENERGY SPECTRA
INSTABILITY
LEVITATION
MAGNETIC FIELD CONFIGURATIONS
MULTIPOLAR CONFIGURATIONS
OCTUPOLAR CONFIGURATIONS
PLASMA
PLASMA DRIFT
PLASMA INSTABILITY
SPECTRA