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- W55256885 abstract "Diffusions of collisionless plasmas were investigated in the dc Octopole. Three types of diffusions were observed in this regime. One is neoclassical diffusion which occurs at low electron temperatures (T/sub c/ < 0.5 eV) and low poloidal magnetic fields. Another diffusion is thermal fluctuation diffusion which takes place when the plasma dielectric constant is small, i.e., in low densities and high magnetic fields. When electrons are heated above 0.5 eV, the third diffusion mode appears. The plasma lifetime in this mode is proportional to the reciprocal of the electron temperature and to the strength of the poloidal magnetic field, but is independent of plasma density and the toroidal magnetic field. Thus, the diffusion is called ''poloidal Bohm'' diffusion since the scaling is similar to Bohm scaling except it has the strength of the poloidal magnetic field instead of the total magnetic field. The magnitude of the plasma lifetime is 500 approx. 1000 times longer than a ''poloidal Bohm Time''. Judging from the magnitude of the diffusion coefficient, the cause of this diffusion is likely to be a weak turbulence due to the presence of trapped electrons. It is also noted that the poloidal Bohm scaling seems to fit the resultsmore » of plasma confinement times of tokamaks and spherators. (auth)« less" @default.
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- W55256885 date "1975-01-01" @default.
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- W55256885 title "Diffusions of dc octopole plasmas in the trapped-electron regime" @default.
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