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Title: Limitations of bootstrap current models

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.
Authors:
 [1] ;  [1] ;  [1] ;  [1]
  1. General Atomics, San Diego, CA (United States)
Publication Date:
Grant/Contract Number:
FG02-95ER54309
Type:
Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 56; Journal Issue: 4; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Research Org:
General Atomics, San Diego, CA (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; bootstrap current; neoclassical; tokamak; drift-kinetic
OSTI Identifier:
1356331

Belli, Emily A., Candy, Jefferey M., Meneghini, Orso, and Osborne, Thomas H.. Limitations of bootstrap current models. United States: N. p., Web. doi:10.1088/0741-3335/56/4/045006.
Belli, Emily A., Candy, Jefferey M., Meneghini, Orso, & Osborne, Thomas H.. Limitations of bootstrap current models. United States. doi:10.1088/0741-3335/56/4/045006.
Belli, Emily A., Candy, Jefferey M., Meneghini, Orso, and Osborne, Thomas H.. 2014. "Limitations of bootstrap current models". United States. doi:10.1088/0741-3335/56/4/045006. https://www.osti.gov/servlets/purl/1356331.
@article{osti_1356331,
title = {Limitations of bootstrap current models},
author = {Belli, Emily A. and Candy, Jefferey M. and Meneghini, Orso and Osborne, Thomas H.},
abstractNote = {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.},
doi = {10.1088/0741-3335/56/4/045006},
journal = {Plasma Physics and Controlled Fusion},
number = 4,
volume = 56,
place = {United States},
year = {2014},
month = {3}
}