Alpha channeling with high-field launch of lower hybrid waves

Ochs, I. E.; Bertelli, N.; Fisch, N. J.

doi:10.1063/1.4935123

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

Journal Article · Wed Nov 04 00:00:00 EST 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4935123· OSTI ID:1225227

^[1]; Bertelli, N. ^[2];

^[3]

Princeton Univ., Princeton, NJ (United States)
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Princeton Univ., Princeton, NJ (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

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.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1225227

Alternate ID(s):: OSTI ID: 1225108

Journal Information:: Physics of Plasmas, Vol. 22, Issue 11; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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Kinetic theory of transport driven current in centrally fuelled plasmas Rax, J. M.; Robiche, J.; Gueroult, R. Physics of Plasmas, Vol. 25, Issue 7 https://doi.org/10.1063/1.5030536	journal	July 2018
On the optimal conditions for alpha-channelling Cianfrani, Francesco; Romanelli, Francesco Nuclear Fusion, Vol. 58, Issue 7 https://doi.org/10.1088/1741-4326/aac128	journal	May 2018
On the optimal conditions for alpha channelling in tokamaks Cianfrani, Francesco; Romanelli, Francesco Nuclear Fusion, Vol. 59, Issue 10 https://doi.org/10.1088/1741-4326/ab3018	journal	August 2019
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