Cross-section effect on charge exchange recombination spectroscopy measurement with the EAST tokamak

Abstract Background: Charge-exchange spectroscopy is a powerful diagnostic tool for determining ion temperatures and rotational velocities in tokamak plasmas. This technique depends on detailed understanding of the atomic physics processes that affect the measured apparent velocities with respect to the true ion rotational velocities. Purpose: The study aims to give correction to Charge eXchange Recombination Spectroscopy(CXRS) measurement with Experimental Advanced Superconducting Tokamak(EAST) because of energy dependence of the charge-exchange cross-sections. Methods: Kinetic theory and numerical approximation of cross-section effects are usually used to evaluate the associated corrections. On EAST, kinetic theory and numerical approximation of cross-section effects will be applied to calculate the corrections. Results: A direct comparison between kinetic theory and numerical approximation of cross-section effects will be given. And kinetic theory is applied to give correction to the CXRS measure data in 2015. Conclusion: The correction results showed that two ways are feasible and charge-exchange cross-section effect has more influence on rotational velocity. It gives a possible way for the CXRS data correction because of charge-exchange cross-section effect. (authors)