Effect of scrape-off-layer current on reconstructed tokamak equilibrium

King, J. R.; Kruger, S. E.; Groebner, R. J.; Hanson, J. D.; Hebert, J. D.; Held, E. D.; Jepson, J. R.

doi:10.1063/1.4972822

Title: Effect of scrape-off-layer current on reconstructed tokamak equilibrium

Journal Article · Fri Jan 13 00:00:00 EST 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4972822· OSTI ID:1339429

^[1];

^[1]; Groebner, R. J. ^[2]; Hanson, J. D. ^[3]; Hebert, J. D. ^[3]; Held, E. D. ^[4];

^[4]

Tech-X Corp., Boulder, CO (United States)
General Atomics, San Diego, CA (United States)
Auburn Univ., Auburn, AL (United States)
Utah State Univ., Logan, UT (United States)

Methods are described that extend fields from reconstructed equilibria to include scrape-off-layer current through extrapolated parametrized and experimental fits. The extrapolation includes both the effects of the toroidal-field and pressure gradients which produce scrape-off-layer current after recomputation of the Grad-Shafranov solution. To quantify the degree that inclusion of scrape-off-layer current modifies the equilibrium, the χ-squared goodness-of-fit parameter is calculated for cases with and without scrape-off-layer current. The change in χ-squared is found to be minor when scrape-off-layer current is included however flux surfaces are shifted by up to 3 cm. Here the impact on edge modes of these scrape-off-layer modifications is also found to be small and the importance of these methods to nonlinear computation is discussed.

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Research Organization:: Tech-X Corp., Boulder, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Contributing Organization:: General Atomics, San Diego, CA; Auburn University, Auburn, AL; Utah State University, Logan, UT

Grant/Contract Number:: FC02-08ER54972; AC02-05CH11231; FC02-04ER54698; FC02-06ER54875; FG02-03ER54692

OSTI ID:: 1339429

Alternate ID(s):: OSTI ID: 1361709

Journal Information:: Physics of Plasmas, Vol. 24, Issue 1; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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