Geometric scalings for the electrostatically driven helical plasma state
Abstract
A new plasma state has been investigated [Akcay et al., Phys. Plasmas 24, 052503 (2017)], with a uniform applied axial magnetic field in a periodic cylinder of length $L=2πR$, driven by helical electrodes. The drive is single helicity, depending on $mθ+kz=mθ-nζ$, where $ζ=z/R$ and $k=-n/R$. For strong $(m,n)=(1,1)$ drive, the state was found to have a strong axial mean current density, with a mean-field safety factor $$q_0(r)$$ just above the pitch of the electrodes $m/n=1$ in the interior. This state has possible applications to DC electrical transformers and tailoring of the current profile in tokamaks. Here, we study two geometric issues of interest for these applications: (i) scaling of properties with the plasma length or aspect ratio and (ii) behavior for different helicities, specifically $(m,n)=(1,n)$ for n > and $(m,n)=(2,1)$.
- Authors:
-
- Tibbar Plasma Technologies, Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Tibbar Plasma Technologies, Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Advanced Research Projects Agency - Energy (ARPA-E)
- OSTI Identifier:
- 1524594
- Alternate Identifier(s):
- OSTI ID: 1414984
- Grant/Contract Number:
- AR0000677
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 24; Journal Issue: 12; 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
Akçay, Cihan, Finn, John M., Nebel, Richard A., and Barnes, Daniel C. Geometric scalings for the electrostatically driven helical plasma state. United States: N. p., 2017.
Web. doi:10.1063/1.5011774.
Akçay, Cihan, Finn, John M., Nebel, Richard A., & Barnes, Daniel C. Geometric scalings for the electrostatically driven helical plasma state. United States. https://doi.org/10.1063/1.5011774
Akçay, Cihan, Finn, John M., Nebel, Richard A., and Barnes, Daniel C. Wed .
"Geometric scalings for the electrostatically driven helical plasma state". United States. https://doi.org/10.1063/1.5011774. https://www.osti.gov/servlets/purl/1524594.
@article{osti_1524594,
title = {Geometric scalings for the electrostatically driven helical plasma state},
author = {Akçay, Cihan and Finn, John M. and Nebel, Richard A. and Barnes, Daniel C.},
abstractNote = {A new plasma state has been investigated [Akcay et al., Phys. Plasmas 24, 052503 (2017)], with a uniform applied axial magnetic field in a periodic cylinder of length $L=2πR$, driven by helical electrodes. The drive is single helicity, depending on $mθ+kz=mθ-nζ$, where $ζ=z/R$ and $k=-n/R$. For strong $(m,n)=(1,1)$ drive, the state was found to have a strong axial mean current density, with a mean-field safety factor $q_0(r)$ just above the pitch of the electrodes $m/n=1$ in the interior. This state has possible applications to DC electrical transformers and tailoring of the current profile in tokamaks. Here, we study two geometric issues of interest for these applications: (i) scaling of properties with the plasma length or aspect ratio and (ii) behavior for different helicities, specifically $(m,n)=(1,n)$ for n > and $(m,n)=(2,1)$.},
doi = {10.1063/1.5011774},
journal = {Physics of Plasmas},
number = 12,
volume = 24,
place = {United States},
year = {Wed Dec 27 00:00:00 EST 2017},
month = {Wed Dec 27 00:00:00 EST 2017}
}
Web of Science
Figures / Tables:
Works referenced in this record:
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journal, May 2017
- Akçay, Cihan; Finn, John M.; Nebel, Richard A.
- Physics of Plasmas, Vol. 24, Issue 5
Semi-implicit magnetohydrodynamic calculations
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Properties of the electrostatically driven helical plasma state
text, January 2017
- Akçay, Cihan; Finn, John M.; Nebel, Richard A.
- arXiv
Figures / Tables found in this record: