Artículo
Modulation of prompt fast-ion loss by applied n=2 fields in the DIII-D tokamak
Autor/es | Zeeland, M. A. van
Ferraro, N. M. Heidbrink, W. W. Kramer, G. J. Pace, D. C. Chen, X. García Muñoz, Manuel |
Departamento | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear |
Fecha de publicación | 2014 |
Fecha de depósito | 2020-09-02 |
Publicado en |
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Resumen | Energy and pitch angle resolved measurements of escaping neutral beam ions (E approximate to 80 keV) have been made during DIII-D L-mode discharges with applied, slowly rotating, n = 2 magnetic perturbations. Data from ... Energy and pitch angle resolved measurements of escaping neutral beam ions (E approximate to 80 keV) have been made during DIII-D L-mode discharges with applied, slowly rotating, n = 2 magnetic perturbations. Data from separate scintillator detectors (FILDs) near and well below the plasma midplane show fast-ion losses correlated with the internal coil (I-coil) fields. The dominant fast-ion loss signals are observed to decay within one poloidal transit time after beam turn-off indicating they are primarily prompt loss orbits. Also, during application of the rotating I-coil fields, outboard midplane edge density and bremsstrahlung emission profiles exhibit a radial displacement of up to delta R approximate to 1 cm. Beam deposition and full orbit modeling of these losses using M3D-C1 calculations of the perturbed kinetic profiles and fields reproduce many features of the measured losses. In particular, the predicted phase of the modulated loss signal with respect to the I-coil currents is in close agreement with FILD measurements as is the relative amplitudes of the modulated losses for the co and counter-current beam used in the experiment. These simulations show modifications to the beam ion birth profile and subsequent prompt loss due to changes in the edge density; however, the dominant factor causing modulation of the losses to the fast-ion loss detectors is the perturbed magnetic field (delta B/B approximate to 10(-3) in the plasma). Calculations indicate total prompt loss to the DIII-D wall can increase with application of the n = 2 perturbation by up to 7% for co-current injected beams and 3% for counter-current injected beams depending on phase of the perturbation relative to the injected beam. |
Identificador del proyecto | DE-FC02-04ER54698
SC-G903402 DEAC02- 09CH11466 DE-FG02-04ER54761 DE-FG02- 05ER54808 |
Cita | Van Zeeland, M.A., Ferraro, N.M., Heidbrink, W.W., Kramer, G.J., Pace, D.C., Chen, X. y García Muñoz, M. (2014). Modulation of prompt fast-ion loss by applied n=2 fields in the DIII-D tokamak. Plasma Physics and Controlled Fusion, 56 (1), 015009-. |
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