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 $mθ+kz=mθnζ$, 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 meanfield 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 (ARPAE)
 OSTI Identifier:
 1524594
 Alternate Identifier(s):
 OSTI ID: 1414984
 Grant/Contract Number:
 AR0000677
 Resource Type:
 Journal Article: Accepted Manuscript
 Journal Name:
 Physics of Plasmas
 Additional Journal Information:
 Journal Volume: 24; Journal Issue: 12; Journal ID: ISSN 1070664X
 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. doi: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. doi: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 $mθ+kz=mθnζ$, 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 meanfield 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},
issn = {1070664X},
number = 12,
volume = 24,
place = {United States},
year = {2017},
month = {12}
}
Web of Science
Figures / Tables:
Works referenced in this record:
Electrostatically driven helical plasma state
journal, May 2017
 Akçay, Cihan; Finn, John M.; Nebel, Richard A.
 Physics of Plasmas, Vol. 24, Issue 5
Semiimplicit magnetohydrodynamic calculations
journal, June 1987
 Schnack, D. D.; Barnes, D. C.; Mikic, Z.
 Journal of Computational Physics, Vol. 70, Issue 2
Single and multiple helicity Ohmic states in reversed‐field pinches
journal, May 1992
 Finn, John M.; Nebel, Rick; Bathke, Charles
 Physics of Fluids B: Plasma Physics, Vol. 4, Issue 5
Review of spheromak research
journal, June 1994
 Jarboe, T. R.
 Plasma Physics and Controlled Fusion, Vol. 36, Issue 6
Figures / Tables found in this record: