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High resolution charge-exchange spectroscopic measurements of aluminum impurity ions in a high temperature plasma

Kumar, S.T.A. and Den Hartog, D. J. and Chapman, B. E. and O'Mullane, Martin and Nornberg, M. and Craig, D. and Eilerman, S. and Fiksel, G. and Parke, E. and Reusch, J. (2012) High resolution charge-exchange spectroscopic measurements of aluminum impurity ions in a high temperature plasma. Plasma Physics and Controlled Fusion, 54 (1). pp. 1-4. ISSN 0741-3335

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Abstract

Charge-exchange recombination spectroscopy, which is generally used to measure low-Z impurities in fusion devices, has been used for measuring Al+11 and Al+13 impurities in the Madison Symmetric Torus reversed field pinch. To obtain the impurity ion temperature, the experimental emission spectrum is fitted with a model which includes fine structure in the atomic transition. Densities of these two ionization states, calculated from charge-exchange emission brightness, are used in combination with a collisional radiative model to estimate the abundance of all other charge states of aluminum in the plasma and the contribution of aluminum to the effective ionic charge of the plasma.