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This content will become publicly available on November 4, 2016

Title: Alpha channeling with high-field launch of lower hybrid waves

Although lower hybrid waves are effective at driving currents in present-day tokamaks, they are expected to interact strongly with high-energy particles in extrapolating to reactors. In the presence of a radial alpha particle birth gradient, this interaction can take the form of wave amplification rather than damping. While it is known that this amplification more easily occurs when launching from the tokamak high-field side, the extent of this amplification has not been made quantitative. Here, by tracing rays launched from the high- field-side of a tokamak, the required radial gradients to achieve amplification are calculated for a temperature and density regime consistent with a hot-ion-mode fusion reactor. As a result, these simulations, while valid only in the linear regime of wave amplification, nonetheless illustrate the possibilities for wave amplification using high-field launch of the lower hybrid wave.
Authors:
 [1] ;  [2] ;  [3]
  1. Princeton Univ., Princeton, NJ (United States)
  2. Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
  3. Princeton Univ., Princeton, NJ (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Publication Date:
OSTI Identifier:
1225227
Grant/Contract Number:
AC02-09CH11466
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 11; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Research Org:
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY tokamaks; current drive; lower hybrid wave; alpha channeling; diffusion; alfven waves; plasma channeling; particle distribution functions