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Experimental study reveals full radial effective ion charge profiles in EAST tokamak plasmas, highlighting improved monitoring of fusion impurities.
The effective ion charge, Zeff, is a critical parameter in quantifying the impurity content and collisionality, and studying neutron yield and impurity transport in magnetically confined fusion plasmas. In order to obtain a full radial Zeff profile in the EAST tokamak, a visible spectrometer system with endscope type optics has been newly developed. A vertical profile of visible bremsstrahlung continuum is observed at 597.8±1.0 nm with well-focused fiber images in a typical L-mode discharge. A local emissivity profile of the visible bremsstrahlung is analyzed using Abel inversion algorithm. The Zeff radial profile is thus obtained for the first time in the EAST experiment.
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Yang et al. (2025) studied this question.
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