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Title: Particle orbits in a force-balanced, wave-driven, rotating torus

Abstract

A wave-driven rotating torus is a recently proposed fusion concept where the rotational transform is provided by the E × B drift resulting from a minor radial electric field. This field can be produced, for instance, by the RF-wave-mediated extraction of fusion-born alpha particles. In this paper, we discuss how macroscopic force balance, i.e., balance of the thermal hoop force, can be achieved in such a device. We show that this requires the inclusion of a small plasma current and vertical magnetic field and identify the desirable reactor regime through free energy considerations. We then analyze particle orbits in this desirable regime, identifying velocity-space anisotropies in trapped (banana) orbits, resulting from the cancellation of rotational transforms due to the radial electric and poloidal magnetic fields. The potential neoclassical effects of these orbits on the perpendicular conductivity, current drive, and transport are discussed.

Authors:
ORCiD logo [1]; ORCiD logo [1]
  1. Princeton Univ., NJ (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1430519
Alternate Identifier(s):
OSTI ID: 1389120
Grant/Contract Number:
FG02-97ER25308; SC0016072
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 9; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Ochs, I. E., and Fisch, N. J.. Particle orbits in a force-balanced, wave-driven, rotating torus. United States: N. p., 2017. Web. doi:10.1063/1.4991510.
Ochs, I. E., & Fisch, N. J.. Particle orbits in a force-balanced, wave-driven, rotating torus. United States. doi:10.1063/1.4991510.
Ochs, I. E., and Fisch, N. J.. Fri . "Particle orbits in a force-balanced, wave-driven, rotating torus". United States. doi:10.1063/1.4991510.
@article{osti_1430519,
title = {Particle orbits in a force-balanced, wave-driven, rotating torus},
author = {Ochs, I. E. and Fisch, N. J.},
abstractNote = {A wave-driven rotating torus is a recently proposed fusion concept where the rotational transform is provided by the E × B drift resulting from a minor radial electric field. This field can be produced, for instance, by the RF-wave-mediated extraction of fusion-born alpha particles. In this paper, we discuss how macroscopic force balance, i.e., balance of the thermal hoop force, can be achieved in such a device. We show that this requires the inclusion of a small plasma current and vertical magnetic field and identify the desirable reactor regime through free energy considerations. We then analyze particle orbits in this desirable regime, identifying velocity-space anisotropies in trapped (banana) orbits, resulting from the cancellation of rotational transforms due to the radial electric and poloidal magnetic fields. The potential neoclassical effects of these orbits on the perpendicular conductivity, current drive, and transport are discussed.},
doi = {10.1063/1.4991510},
journal = {Physics of Plasmas},
number = 9,
volume = 24,
place = {United States},
year = {Fri Sep 01 00:00:00 EDT 2017},
month = {Fri Sep 01 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on September 1, 2018
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