Non-axisymmetric equilibrium reconstruction of a current-carrying stellarator using external magnetic and soft x-ray inversion radius measurements

X. Ma; D. A. Maurer; S. F. Knowlton; M. C. Archmiller; M. R. Cianciosa; D. A. Ennis; J. D. Hanson; G. J. Hartwell; J. D. Hebert; J. L. Herfindal; M. D. Pandya; N. A. Roberds; P. J. Traverso

doi:10.1063/1.4938031

Non-axisymmetric equilibrium reconstruction of a current-carrying stellarator using external magnetic and soft x-ray inversion radius measurements

X. Ma, D. A. Maurer, S. F. Knowlton, M. C. Archmiller, M. R. Cianciosa, D. A. Ennis, J. D. Hanson, G. J. Hartwell, J. D. Hebert, J. L. Herfindal, M. D. Pandya, N. A. Roberds, P. J. Traverso

Plasma Theory and Modeling

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Abstract

Non-axisymmetric free-boundary equilibrium reconstructions of stellarator plasmas are performed for discharges in which the magnetic configuration is strongly modified by ohmically driven plasma current. These studies were performed on the compact toroidal hybrid device using the V3FIT reconstruction code with a set of 50 magnetic diagnostics external to the plasma. With the assumption of closed magnetic flux surfaces, the reconstructions using external magnetic measurements allow accurate estimates of the net toroidal flux within the last closed flux surface, the edge safety factor, and the plasma shape of these highly non-axisymmetric plasmas. The inversion radius of standard sawteeth is used to infer the current profile near the magnetic axis; with external magnetic diagnostics alone, the current density profile is imprecisely reconstructed.

Original language	English
Article number	122509
Journal	Physics of Plasmas
Volume	22
Issue number	12
DOIs	https://doi.org/10.1063/1.4938031
State	Published - Dec 1 2015

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Ma, X., Maurer, D. A., Knowlton, S. F., Archmiller, M. C., Cianciosa, M. R., Ennis, D. A., Hanson, J. D., Hartwell, G. J., Hebert, J. D., Herfindal, J. L., Pandya, M. D., Roberds, N. A., & Traverso, P. J. (2015). Non-axisymmetric equilibrium reconstruction of a current-carrying stellarator using external magnetic and soft x-ray inversion radius measurements. Physics of Plasmas, 22(12), Article 122509. https://doi.org/10.1063/1.4938031

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title = "Non-axisymmetric equilibrium reconstruction of a current-carrying stellarator using external magnetic and soft x-ray inversion radius measurements",

abstract = "Non-axisymmetric free-boundary equilibrium reconstructions of stellarator plasmas are performed for discharges in which the magnetic configuration is strongly modified by ohmically driven plasma current. These studies were performed on the compact toroidal hybrid device using the V3FIT reconstruction code with a set of 50 magnetic diagnostics external to the plasma. With the assumption of closed magnetic flux surfaces, the reconstructions using external magnetic measurements allow accurate estimates of the net toroidal flux within the last closed flux surface, the edge safety factor, and the plasma shape of these highly non-axisymmetric plasmas. The inversion radius of standard sawteeth is used to infer the current profile near the magnetic axis; with external magnetic diagnostics alone, the current density profile is imprecisely reconstructed.",

author = "X. Ma and Maurer, {D. A.} and Knowlton, {S. F.} and Archmiller, {M. C.} and Cianciosa, {M. R.} and Ennis, {D. A.} and Hanson, {J. D.} and Hartwell, {G. J.} and Hebert, {J. D.} and Herfindal, {J. L.} and Pandya, {M. D.} and Roberds, {N. A.} and Traverso, {P. J.}",

note = "Publisher Copyright: {\textcopyright} 2015 AIP Publishing LLC.",

year = "2015",

month = dec,

day = "1",

doi = "10.1063/1.4938031",

language = "English",

volume = "22",

journal = "Physics of Plasmas",

issn = "1070-664X",

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Ma, X, Maurer, DA, Knowlton, SF, Archmiller, MC, Cianciosa, MR, Ennis, DA, Hanson, JD, Hartwell, GJ, Hebert, JD, Herfindal, JL, Pandya, MD, Roberds, NA & Traverso, PJ 2015, 'Non-axisymmetric equilibrium reconstruction of a current-carrying stellarator using external magnetic and soft x-ray inversion radius measurements', Physics of Plasmas, vol. 22, no. 12, 122509. https://doi.org/10.1063/1.4938031

TY - JOUR

T1 - Non-axisymmetric equilibrium reconstruction of a current-carrying stellarator using external magnetic and soft x-ray inversion radius measurements

AU - Ma, X.

AU - Maurer, D. A.

AU - Knowlton, S. F.

AU - Archmiller, M. C.

AU - Cianciosa, M. R.

AU - Ennis, D. A.

AU - Hanson, J. D.

AU - Hartwell, G. J.

AU - Hebert, J. D.

AU - Herfindal, J. L.

AU - Pandya, M. D.

AU - Roberds, N. A.

AU - Traverso, P. J.

PY - 2015/12/1

Y1 - 2015/12/1

N2 - Non-axisymmetric free-boundary equilibrium reconstructions of stellarator plasmas are performed for discharges in which the magnetic configuration is strongly modified by ohmically driven plasma current. These studies were performed on the compact toroidal hybrid device using the V3FIT reconstruction code with a set of 50 magnetic diagnostics external to the plasma. With the assumption of closed magnetic flux surfaces, the reconstructions using external magnetic measurements allow accurate estimates of the net toroidal flux within the last closed flux surface, the edge safety factor, and the plasma shape of these highly non-axisymmetric plasmas. The inversion radius of standard sawteeth is used to infer the current profile near the magnetic axis; with external magnetic diagnostics alone, the current density profile is imprecisely reconstructed.

AB - Non-axisymmetric free-boundary equilibrium reconstructions of stellarator plasmas are performed for discharges in which the magnetic configuration is strongly modified by ohmically driven plasma current. These studies were performed on the compact toroidal hybrid device using the V3FIT reconstruction code with a set of 50 magnetic diagnostics external to the plasma. With the assumption of closed magnetic flux surfaces, the reconstructions using external magnetic measurements allow accurate estimates of the net toroidal flux within the last closed flux surface, the edge safety factor, and the plasma shape of these highly non-axisymmetric plasmas. The inversion radius of standard sawteeth is used to infer the current profile near the magnetic axis; with external magnetic diagnostics alone, the current density profile is imprecisely reconstructed.

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U2 - 10.1063/1.4938031

DO - 10.1063/1.4938031

M3 - Article

AN - SCOPUS:84952838333

SN - 1070-664X

VL - 22

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 12

M1 - 122509

ER -

Non-axisymmetric equilibrium reconstruction of a current-carrying stellarator using external magnetic and soft x-ray inversion radius measurements

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