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- A nd 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.

East Team, T., Madsen, B., Huang, J., Salewski, M., Jarleblad, H., Hansen, P., et al. (2020). Fast-ion velocity-space tomography using slowing-down regularization in EAST plasmas with co- A nd counter-current neutral beam injection. PLASMA PHYSICS AND CONTROLLED FUSION, 62(11) [10.1088/1361-6587/abb79b].

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

Nocente M.;
2020

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- A nd 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.
Articolo in rivista - Articolo scientifico
velocity-space tomography; fast-ion D-alpha spectroscopy; fast ions; slowing-down regularization; EAST tokamak;
English
2020
62
11
115019
none
East Team, T., Madsen, B., Huang, J., Salewski, M., Jarleblad, H., Hansen, P., et al. (2020). Fast-ion velocity-space tomography using slowing-down regularization in EAST plasmas with co- A nd counter-current neutral beam injection. PLASMA PHYSICS AND CONTROLLED FUSION, 62(11) [10.1088/1361-6587/abb79b].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/349375
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