A bremsstrahlung diagnostic has been deployed on the Mega Ampere Spherical Tokamak (MAST), with matrix viewing of the full plasma cross section in a narrow region of the continuum free of spectral lines. An uncooled CCD detector is used to provide 100 Hz 128×128 matrix viewing of the plasma emissivity which is spectrally selected using an interference filter of only ∼0.5 nm bandwidth. The apparently conflicting demands of a large field of view for the plasma and the small solid angle for narrow spectral bandwidth is accommodated in a compact lens, filter, and detector arrangement. Using measured electron temperature and density profiles the Zeff profile evolution is determined.
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Patel et al. (2004) studied this question.
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