Fast-ion velocity-space tomography using slowing-down regularization in EAST plasmas with co- and counter-current neutral beam injection: Paper

B. Madsen*, J. Huang, Mirko Salewski, H. Järleblad, P.C. Hansen, L. Stagner, J. Su, J. F. Chang, J. Fu, J. F. Wang, L. Z. Liang, G. Q. Zhong, Y. Y. Li, B. Lyu, H. Q. Liu, Q. Zang, Z. P. Luo, M. Nocente, D. Moseev, T. S. FanY. M. Zhang, D. Yang, J. Q. Sun, L. Y. Liao

*Corresponding author for this work

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Abstract

We demonstrate 2D reconstructions of the fast-ion velocity distribution from two-view fast-ion D-alpha (FIDA) measurements at the EAST tokamak. By expressing the distribution in a basis relying on the fast-ion slowing-down process in fusion plasmas, the smoothness and velocity-space resolution of reconstructions are improved. We reconstruct distributions of fast ions born from simultaneous co- and counter-current neutral beam injection and detect the expected distinct change in fast-ion birth pitch when comparing discharges utilizing different neutral beam injectors. For purely co-current injection, we find a good agreement between TRANSP-predicted and reconstructed fast-ion densities, pressures and current densities for energies above 20 keV. We furthermore illustrate the improvement of the reconstructed high-energy range (> 40 keV) of the distribution by combining FIDA with neutron emission spectroscopy measurements with the compact single-plate EJ301 scintillator.
Original languageEnglish
Article number115019
JournalPlasma Physics and Controlled Fusion
Volume62
Issue number11
Number of pages14
ISSN0741-3335
DOIs
Publication statusPublished - 2020

Keywords

  • Velocity-space tomography
  • Fast-ion D-alpha spectroscopy
  • Fast ions
  • Slowing-down regularization
  • EAST tokamak

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