Identification of an Optimized Heating and Fast Ion Generation Scheme for the Wendelstein 7-X Stellarator

A Doppler shifted resonance minority species ion cyclotron range of frequency (ICRF) scheme for heating neutral beam ions has been identified and optimized for theWendelstein 7-X stellarator. Compared with more conventional methods, the synergetic scheme increases the normalized core collisional power transfer to the background plasma, and induces larger concentrations of energetic ions. Simulations in the intricate 3D magnetic stellarator geometry reveal an energetic distribution function that is only weakly anisotropic, and is thus relevant to fast ion and alpha particle driven Alfv ' en eigenmode experimental preparation. Quasilinear theory and simulations of the Joint European Torus indicate that the excellent confinement properties are due to increased velocity diffusion from ICRF interaction along the magnetic field lines. Agreement is found between SCENIC simulations and Joint European Torus experimental measurements for the total neutron rate and the energy distribution of the fast ions.


Published in:
Physical Review Letters, 124, 15, 155001
Year:
Apr 15 2020
ISSN:
0031-9007
1079-7114
Note:
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license.
Laboratories:


Note: The status of this file is: Anyone


 Record created 2020-04-29, last modified 2020-05-07

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