Phase-space resolved measurement of 2nd harmonic ion cyclotron heating using FIDA tomography at the ASDEX Upgrade tokamak: Paper

M. Weiland, R. Bilato, B. Geiger, P. A. Schneider, G. Tardini, M. Garcia-Muñoz, F. Ryter, Mirko Salewski, H. Zohm

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Abstract

Recent upgrades to the FIDA (fast-ion D-alpha) diagnostic at ASDEX Upgrade allow to reconstruct the fast-ion phase space at several radial positions with decent energy and pitch resolution. These new diagnostic capabilities are applied to study the physics of 2nd harmonic ion cyclotron heating, which is a foreseen heating scenario for ITER. In particular, the acceleration of deuterium beam ions above the injection energy by absorption of ion cyclotron waves at the 2nd harmonic is investigated and compared to theoretical predictions by the TORIC-SSFPQL and TORIC-NUBEAM code packages. Furthermore, comparisons to other fast-ion diagnostics (neutron yield and neutral particle analyzers) are discussed.
Original languageEnglish
Article number116058
JournalNuclear Fusion
Volume57
Issue number11
Number of pages15
ISSN0029-5515
DOIs
Publication statusPublished - 2017

Keywords

  • Velocity space tomography
  • Fast ions
  • Spectroscopy
  • Neutron rate
  • Neutral particle analyzer
  • Zero orbit width
  • Quasi-linear

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