Cross-section Effect On Charge Exchange Recombination Spectroscopy Measurement On The EAST Tokamak

EAST (Experimental Advanced Superconducting Tokamak) is the first full superconducting Tokamak in the world. This thesis mainly studies correction to Charge eXchange Recombination Spectroscopy (CXRS) measurement with EAST because of energy dependence of the charge-exchange cross-sections. CXRS is a key diagnostic tool to present and future tokamak, ion temperature and rotational velocity are essential to study plasma configuration and constraint in tokamak.First it is a brief introduction about tokamak and full superconducting tokamak, followed by summarizing principle and the key components of charge exchange recombination spectroscopy. Cross-section is due to the non-perpendicular observations between viewing geometry and the tangential direction of NBI. In order to get the angle between viewing sight in every channel and the tangential direction of NBI, the spatial calibration has been finished with the help of mechanical arm. The spatial calibration makes preparation for the following correction to charge exchange cross-section.Another work of this thesis has corrected charge exchange cross-section to CXRS on EAST. For thermal particles, with a Maxwellian velocity distribution function, a Gaussian spectrum, for which the Doppler-broadened width represents the local ion temperature and Doppler-shift represents rotational velocity. The collision-energy dependent cross-section leads effectively to a lineshift (apparent velocity) and a reduction in linewidth (apparent temperature) in the CXRS of EAST. So the ion temperature and rotational velocity from CX spectrum are not accurate. The correction to Charge eXchange cross-section is very important. 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. 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.