Neutral beam injection and plasma convection in a magnetic field
Injection of a neutral beam into a plasma in a magnetic field has been studied by means of numerical plasma simulations. It is found that, in the absence of a rotational transform, the convection electric field arising from the polarization charges at the edges of the beam is dissipated by turbulent plasma convection, leading to anomalous plasma diffusion across the magnetic field. The convection electric field increases with the beam density and beam energy. In the presence of a rotational transform, polarization charges can be neutralized by the electron motion along the magnetic field. Even in the presence of a rotational transform, a steady-state convection electric field and, hence, anomalous plasma diffusion can develop when a neutral beam is constantly injected into a plasma. Theoretical investigations on the convection electric field are described for a plasma in the presence of rotational transform. 11 refs., 19 figs.
- Research Organization:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 7108894
- Report Number(s):
- PPPL-2522; ON: DE88011875
- Country of Publication:
- United States
- Language:
- English
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Diffusion of a plasma subject to neutral beam injection
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Related Subjects
PLASMA
NEUTRAL ATOM BEAM INJECTION
PLASMA CONFINEMENT
CONVECTIVE INSTABILITIES
ELECTRIC FIELDS
MAGNETIC FIELDS
PLASMA SIMULATION
BEAM INJECTION
CONFINEMENT
INSTABILITY
PLASMA INSTABILITY
SIMULATION
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