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

Ma, X.; Maurer, D. A.; Knowlton, Stephen F.; ArchMiller, M. C.; Ennis, D. A.; Hanson, J. D.; Hartwell, G. J.; Hebert, J. D.; Herfindal, J. L.; Pandya, M. D.; Roberts, N. A.; Traverso, P. J.; Cianciosa, M. R.

doi:10.1063/1.4938031

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

Journal Article · Tue Dec 22 00:00:00 EST 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4938031· OSTI ID:1263869

Ma, X. ^[1]; Maurer, D. A. ^[1]; Knowlton, Stephen F. ^[1]; ArchMiller, M. C. ^[1]; Ennis, D. A. ^[1]; Hanson, J. D. ^[1]; Hartwell, G. J. ^[1]; Hebert, J. D. ^[1]; Herfindal, J. L. ^[1]; Pandya, M. D. ^[1]; Roberts, N. A. ^[1]; Traverso, P. J. ^[1]; Cianciosa, M. R. ^[2]

Auburn Univ., Auburn, AL (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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. Lastly, the inversion radius of standard saw-teeth is used to infer the current profile near the magnetic axis; with external magnetic diagnostics alone, the current density profile is imprecisely reconstructed.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1263869

Alternate ID(s):: OSTI ID: 22489930

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 12 Vol. 22; ISSN PHPAEN; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Development of a non-parametric Gaussian process model in the three-dimensional equilibrium reconstruction code V3FIT Howell, Eric C.; Hanson, J. D. Journal of Plasma Physics, Vol. 86, Issue 1 https://doi.org/10.1017/s0022377819000813	journal	January 2020
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