Alpha channelling: status and perspectives


  • Datum: 25.10.2019
  • Uhrzeit: 10:30 - 12:30
  • Vortragende(r): Prof. F. Romanelli
  • Francesco Romanelli has been the Leader from 2006 to 2014 of the Joint European Torus the largest magnetic fusion experiment in the world and the Leader of the European Fusion Development Agreement (EFDA), in charge of the coordination of physics and technology activities in the European fusion laboratories. In 2010 he has chaired the EIROforum partnership between the eight major European multi-governmental research organizations (CERN, ESA, ESO, EMBL, ILL, ESRF, XFEL and JET). He has directed the activities in Physics of Magnetic Confinement Fusion at ENEA Frascati from 1996 to 2006. From 2003 to 2006 he has been Chairman of the Science and Technology Advisory Committee of EFDA. He is presently Professor of Physics of Nuclear Energy at the University of Rome "Tor Vergata" and Research Director at ENEA.
  • Ort: Garching und Greifswald
  • Raum: Hörsaal D2 (Übertragung nach HGW S1)
  • Gastgeber: IPP
Alpha channelling: status and perspectives
Alpha channelling is a mechanism to deposit the energy of the fusion-generated alpha particles directly into the bulk ion population through wave-particle interaction. Its interest is associated with the possibility of increasing the margin for high-gain operation of a burning plasma. The alpha-channelling mechanism relies on the interaction between the fusion alphas and a high-frequency wave (typically an ion Bernstein wave (IBW) obtained via mode conversion of a Fast Wave injected by an external antenna) that extracts the kinetic energy associated with perpendicular motion through a resonant interaction that breaks the magnetic moment. The crucial point is that diffusion in velocity and diffusion in space are tied together. Thus, the extraction of alpha particle energy by the IBW is associated with a radial displacement of the alpha particle towards the plasma edge. The present understanding of alpha channelling will be reviewed and the perspective for burning plasma applications will be discussed.
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