Physics – Plasma Physics
Scientific paper
2008-06-04
Mechanics Research Communications, Volume 38, Issue 2, March 2011, Pages 146-151
Physics
Plasma Physics
13 pages, 2 figures, moderate revision, final version, edited for length, to appear in MRC
Scientific paper
10.1016/j.mechrescom.2011.01.007
The neoclassical prescription to use an equation of motion to determine the electrostatic field within a tokamak plasma is fraught with difficulties. Herein we examine two popular expressions for the equilibrium electrostatic field so determined and show that one fails to withstand a formal scrutiny thereof while the other fails to respect the vector nature of the diamagnetic current. Reconsideration of the justification for the presence of the equilibrium electrostatic field indicates that no field is needed for a neutral plasma when considering the net bound current defined as the curl of the magnetization. With any shift in the toroidal magnetic flux distribution, a dynamic electric field is generated with both radial and poloidal components, providing an alternate explanation for any measurements thereof.
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