Limitations of bootstrap current models

Belli, Emily A.; Candy, Jefferey M.; Meneghini, Orso; Osborne, Thomas H.

doi:10.1088/0741-3335/56/4/045006

Title: Limitations of bootstrap current models

Journal Article · Thu Mar 27 00:00:00 EDT 2014 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/0741-3335/56/4/045006· OSTI ID:1356331

Belli, Emily A. ^[1]; Candy, Jefferey M. ^[1]; Meneghini, Orso ^[1]; Osborne, Thomas H. ^[1]

General Atomics, San Diego, CA (United States)

We assess the accuracy and limitations of two analytic models of the tokamak bootstrap current: (1) the well-known Sauter model and (2) a recent modification of the Sauter model by Koh et al. For this study, we use simulations from the first-principles kinetic code NEO as the baseline to which the models are compared. Tests are performed using both theoretical parameter scans as well as core- to-edge scans of real DIII-D and NSTX plasma profiles. The effects of extreme aspect ratio, large impurity fraction, energetic particles, and high collisionality are studied. In particular, the error in neglecting cross-species collisional coupling – an approximation inherent to both analytic models – is quantified. Moreover, the implications of the corrections from kinetic NEO simulations on MHD equilibrium reconstructions is studied via integrated modeling with kinetic EFIT.

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: FG02-95ER54309

OSTI ID:: 1356331

Journal Information:: Plasma Physics and Controlled Fusion, Vol. 56, Issue 4; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 27 works

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