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.
Fast-ion velocity-space tomography using slowing-down regularization in EAST plasmas with co- and counter-current neutral beam injection
Madsen, B.; Huang, J.; Salewski, M.; Jarleblad, H.; Hansen, P. C.; Stagner, L.; Su, J.; Chang, J. F.; Fu, J.; Wang, J. F.; Liang, L. Z.; Zhong, G. Q.; Li, Y. Y.; Lyu, B.; Liu, H. Q.; Zang, Q.; Luo, Z. P.; Nocente, M.; Moseev, D.; Fan, T. S.; Zhang, Y. M.; Yang, D.; Sun, J. Q.; Liao, L. Y.
ID | 463536 |
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DOI | 10.1088/1361-6587/abb79b |
PRODUCT TYPE | Journal Article |
LAST UPDATE | 2022-02-04T09:48:59Z |
EU PROJECT | EUROfusion |
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TITLE | Implementation of activities described in the Roadmap to Fusion during Horizon 2020 through a Joint programme of the members of the EUROfusion consortium |
FOUNDING PROGRAM | H2020 |