Linewidth-modulated motional Stark effect measurements of internal field structure in low-field configurations

Reinecke, E. A.; Fonck, R. J.; Thorson, T. A.
January 2001
Review of Scientific Instruments;Jan2001, Vol. 72 Issue 1, p1000
Academic Journal
Motional Stark effect measurements of internal field structure in low-field magnetic confinement configurations are considered for both magnitude and direction of the local magnetic field. The amplitude and phase delay of an oscillating spectral linewidth driven by a rotating polarizer provides a means of determining the magnitude and direction of the total field simultaneously while avoiding difficulties of neutral beam energy drift. Photon-noise limit estimates for a diagnostic beam on the low-field PEGASUS toroidal experiment indicate sensitivities of roughly 20 G and 0.2° for the magnitude and direction angle. These values are sufficient to provide significant constraints on magnetic equilibrium reconstructions. © 2001 American Institute of Physics.


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