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Author(s):
V.D. Pustovitov
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Title:
Magnetic Diagnostics: General Principles and the Problem of Reconstruction of Plasma Current
and Pressure Profiles in Toroidal Systems
Date of publication:
Apr. 2000
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Key words:
Magnetic diagnostics, tokamaks, stellarators, plasma equilibrium, pressure profile, current distribution
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Abstract:
The restrictions of the magnetic diagnostics are discussed. Being related to the integral nature of the measurable quantities, they follow from the fundamental laws of electromagnetism. A series of particular examples demonstrating the strength of these restrictions is given and analyzed. A general rule is emphasized that the information obtained from external magnetic measurements is obviously insufficient for the reliable evaluation of plasma current and pressure profiles in tokamaks or in stellarators. The underlying reason is that outside the plasma the own field of the equilibrium plasma currents is determined by the boundary conditions on the plasma surface only.
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