Benchmark and combined velocity-space tomography of fast-ion D-alpha spectroscopy and collective Thomson scattering measurements. (5th February 2016)

• Record Type: Journal Article
• Authors: Jacobsen, A S; Salewski, M; Geiger, B; Korsholm, S B; Leipold, F; Nielsen, S K; Rasmussen, J; Stejner, M; Weiland, M
• Other Names: collab.
• Is Part Of: Plasma physics and controlled fusion. Volume 58:Number 4(2016:Apr.)
• Publication Date: 2016-02-05
• Subjects: velocity-space tomography -- collective Thomson scattering -- fast-ion D-alpha spectroscopy -- sawtooth crash -- tokamak; Plasma (Ionized gases) -- Periodicals; Controlled fusion -- Periodicals; 530.44
• DOI: 10.1088/0741-3335/58/4/042002
• Languages: English
• ISSNs: 0741-3335

Abstract

Abstract: We demonstrate the combination of fast-ion D-alpha spectroscopy (FIDA) and collective Thomson scattering (CTS) measurements to determine a common best estimate of the fast-ion velocity distribution function by velocity-space tomography. We further demonstrate a benchmark of FIDA tomography and CTS measurements without using a numerical simulation as common reference. Combined velocity-space tomographies from FIDA and CTS measurements confirm that sawtooth crashes reduce the fast-ion phase-space densities in the plasma center and affect ions with pitches close to one more strongly than those with pitches close to zero.