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Optical mixing based confined alpha particle diagnostic

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4 Author(s)
Umstattd, R.J. ; Department of Applied Science, University of California, Davis, California 95616 ; Domier, C.W. ; Luhmann, N.C., Jr. ; Cohen, B.I.

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A method for probing the confined alpha particle velocity distribution function in a fusion plasma by exciting and scattering from a lower hybrid wave is described. Two microwave sources propagating perpendicular to the magnetic field optically mix inside the plasma, and the frequency of one of the sources is swept such that their difference frequency passes through a lower hybrid resonance. A third microwave source propagating antiparallel to one of the mixing sources scatters from this excited beat wave with the scattered radiation propagating antiparallel to the other mixing source. Thus, the scattered signal power can be easily recovered and used to reconstruct the alpha particle distribution function since the width of the detected resonance is proportional to the slope of the alpha distribution function. © 1997 American Institute of Physics.

Published in:

Review of Scientific Instruments  (Volume:68 ,  Issue: 1 )