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Helicon and lower hybrid current drive comparisons in tokamak geometry

Published online by Cambridge University Press:  17 July 2023

Peter J. Catto Open the ORCID record for Peter J. Catto [Opens in a new window]  and
Muni Zhou Open the ORCID record for Muni Zhou [Opens in a new window]
Peter J. Catto*
Affiliation:
Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA, USA
Muni Zhou
Affiliation:
Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA, USA Department of Astrophysical Sciences, Princeton University, Princeton, NJ, USA School of Natural Science, Institute for Advanced Study, Princeton, NJ, USA
*
†Email address for correspondence: catto@psfc.mit.edu
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Abstract

The parallel current driven by applied helicon waves is evaluated in tokamak geometry along with the radio frequency (rf) power absorbed by the passing electrons. The results are compared with the corresponding expressions for lower hybrid current drive. The efficiency of both current drive schemes is found to be the same for any single wave frequency, single mode number limit. The evaluation of the parallel currents is performed using an adjoint technique. Tokamak geometry is retained by using an eigenfunction expansion appropriate for a transit averaged long mean free path treatment of electrons making correlated poloidal passes through the applied rf fields.

Keywords

fusion plasmaplasma confinementplasma waves
Type
Research Article
Information
Journal of Plasma Physics , Volume 89 , Issue 4 , August 2023 , 905890405
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Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press

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