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Author(s):
J. Xu, K. Ida and J. Fujita
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Title:
A Note for Pitch Angle Measurement of Magnetic Field in a Toroidal Plasma Using Motional Stark Effect
Date of publication:
Apr. 1995
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Key words:
motional Stark effect, pitch angle measurement
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Abstract:
In this letter, the spectral asymmetry of the motional Stark spectrum of a neutral beam emission in a toroidal plasma is revealed. The pi component is more peaked on the more-Doppler-shifted wavelength side about the sigma component, mainly owing to the existence of the angular divergence of the injected beam. A method using the sigma component to measure the pitch angle in the case of a high magnetic field with an optical system containing two polarizers is also demonstrated. It is predicted that the pitch angle could be measured with an accuracy of about 2%.
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