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It is shown that the alpha-particle contribution to the scattered power can be dominant in the coherent scattering of a CO 2 laser in a Maxwellian plasma. For T i = T e = 10 keV, the optimal forward-scattering angle is around 1.0°, with detection of the electron density fluctuation wavenumbers k ⊥ >> k ‖ (relative to the toroidal magnetic field). A strong resonance occurs at the lower hybrid frequency. Because of the strong dependence of the scattered signal on the alpha-particle temperature and the alpha distribution function, it seems feasible that CO 2 laser scattering, using heterodyne techniques, could give detailed local information on fusion alphas.
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Vahala et al. (1986) studied this question.
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