Abstract
Local magnetic fields in a tokamak plasma have been measured by laser light scattering from the free electrons. This technique exploits the sensitivity of the cyclotron modulation of the scattered light spectrum to the angle between the local magnetic field and the plane in which the scattered light is observed. Theoretical constraints for observation of the modulated light spectrum are satisfied in the experimental conditions. Sufficient accuracy is achieved to derive the detailed volume current distribution—an essential factor in the energy balance and in plasma stability. The method may be applied to the considerably larger fusion research facilities currently envisaged.
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