Benchmark and combined velocity-space tomography of fast-ion D-alpha spectroscopy and collective Thomson scattering measurements

Asger Schou Jacobsen, Mirko Salewski, B. Geiger, Søren Bang Korsholm, Frank Leipold, Stefan Kragh Nielsen, Jesper Rasmussen, Morten Stejner Pedersen, M. Weiland

Research output: Contribution to journalJournal articleResearchpeer-review

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 fastion 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.
Original languageEnglish
Article number042002
JournalPlasma Physics and Controlled Fusion
Volume58
Issue number4
Number of pages5
ISSN0741-3335
DOIs
Publication statusPublished - 2016

Keywords

  • Velocity-space tomography
  • Collective Thomson scattering
  • Fast-ion D-alpha spectroscopy
  • Sawtooth crash
  • Tokamak

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