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Title: Magnetic flux pumping in 3D nonlinear magnetohydrodynamic simulations

A self-regulating magnetic flux pumping mechanism in tokamaks that maintains the core safety factor at q≈1, thus preventing sawteeth, is analyzed in nonlinear 3D magnetohydrodynamic simulations using the M3D-C1 code. In these simulations, the most important mechanism responsible for the flux pumping is that a saturated (m=1,n=1) quasi-interchange instability generates an effective negative loop voltage in the plasma center via a dynamo effect. It is shown that sawtoothing is prevented in the simulations if β is sufficiently high to provide the necessary drive for the (m=1,n=1) instability that generates the dynamo loop voltage. In conclusion, the necessary amount of dynamo loop voltage is determined by the tendency of the current density profile to centrally peak which, in our simulations, is controlled by the peakedness of the applied heat source profile.
Authors:
 [1] ; ORCiD logo [2] ;  [3] ;  [3] ; ORCiD logo [3] ;  [3] ; ORCiD logo [2]
  1. Max-Planck/Princeton Research Center for Plasma Physics, Princeton, NJ (United States)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. Max Planck Institute for Plasma Physics, Garching (Germany)
Publication Date:
Report Number(s):
PPPL-5407
Journal ID: ISSN 1070-664X; TRN: US1800926
Grant/Contract Number:
AC02-09CH11466
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 10; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Research Org:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1416335

Krebs, I., Jardin, S. C., Gunter, S., Lackner, K., Hoelzl, M., Strumberger, E., and Ferraro, N.. Magnetic flux pumping in 3D nonlinear magnetohydrodynamic simulations. United States: N. p., Web. doi:10.1063/1.4990704.
Krebs, I., Jardin, S. C., Gunter, S., Lackner, K., Hoelzl, M., Strumberger, E., & Ferraro, N.. Magnetic flux pumping in 3D nonlinear magnetohydrodynamic simulations. United States. doi:10.1063/1.4990704.
Krebs, I., Jardin, S. C., Gunter, S., Lackner, K., Hoelzl, M., Strumberger, E., and Ferraro, N.. 2017. "Magnetic flux pumping in 3D nonlinear magnetohydrodynamic simulations". United States. doi:10.1063/1.4990704. https://www.osti.gov/servlets/purl/1416335.
@article{osti_1416335,
title = {Magnetic flux pumping in 3D nonlinear magnetohydrodynamic simulations},
author = {Krebs, I. and Jardin, S. C. and Gunter, S. and Lackner, K. and Hoelzl, M. and Strumberger, E. and Ferraro, N.},
abstractNote = {A self-regulating magnetic flux pumping mechanism in tokamaks that maintains the core safety factor at q≈1, thus preventing sawteeth, is analyzed in nonlinear 3D magnetohydrodynamic simulations using the M3D-C1 code. In these simulations, the most important mechanism responsible for the flux pumping is that a saturated (m=1,n=1) quasi-interchange instability generates an effective negative loop voltage in the plasma center via a dynamo effect. It is shown that sawtoothing is prevented in the simulations if β is sufficiently high to provide the necessary drive for the (m=1,n=1) instability that generates the dynamo loop voltage. In conclusion, the necessary amount of dynamo loop voltage is determined by the tendency of the current density profile to centrally peak which, in our simulations, is controlled by the peakedness of the applied heat source profile.},
doi = {10.1063/1.4990704},
journal = {Physics of Plasmas},
number = 10,
volume = 24,
place = {United States},
year = {2017},
month = {9}
}