Response of a tokamak plasma to particle and momentum sources
The response of an axisymmetric toroidal tokamak plasma to first-order particle and momentum sources is investigated. The momentum sources drive coupled poloidal and toroidal mass flows and electrostatic field evolution which relax to asymptotic values on a time scale that is characteristic of the dominant viscous or external drag mechanism. The asymptotic steady-state momentum balance provides the necessary condition to completely determine the particle fluxes and currents in the flux surfaces, and, hence, to determine transport fluxes across flux surfaces. Transport fluxes are driven across flux surfaces both by interspecies collisional momentum exchange, the usual case, and by momentum exchange between the plasma and external sources and/or drags. A generalized Ohm's law is obtained and used to determine the manner in which particle and momentum sources can drive parallel currents and can alter the evolution of the q-profile. The theory is formulated for arbitrary plasma cross sections, beta, and collision regimes.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 6504073
- Report Number(s):
- ORNL/TM-6575; TRN: 79-006316
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
TOKAMAK DEVICES
CHARGED-PARTICLE TRANSPORT
ELECTRIC CURRENTS
ELECTROSTATICS
LINEAR MOMENTUM
NEUTRAL ATOM BEAM INJECTION
OHM LAW
BEAM INJECTION
CLOSED PLASMA DEVICES
CURRENTS
RADIATION TRANSPORT
THERMONUCLEAR DEVICES
700105* - Fusion Energy- Plasma Research- Plasma Kinetics-Theoretical- (-1987)