On velocity-space sensitivity of fast-ion D-alpha spectroscopy

M Salewski, B Geiger, D Moseev, W W Heidbrink, A S Jacobsen, S B Korsholm, F Leipold, J Madsen, S K Nielsen, J Rasmussen, M Stejner, M Weiland
2014 Plasma Physics and Controlled Fusion  
The velocity-space observation regions and sensitivities in fast-ion D α (FIDA) spectroscopy measurements are often described by so-called weight functions. Here we derive expressions for FIDA weight functions accounting for the Doppler shift, Stark splitting, and the charge-exchange reaction and electron transition probabilities. Our approach yields an efficient way to calculate correctly scaled FIDA weight functions and implies simple analytic expressions for their boundaries that separate
more » ... es that separate the triangular observable regions in (v , v ⊥ )-space from the unobservable regions. These boundaries are determined by the Doppler shift and Stark splitting and could until now only be found by numeric simulation.
doi:10.1088/0741-3335/56/10/105005 fatcat:efybdkhtpjdqvlrrklqdlvhcdu