Peer-Reviewed Journal Details
Mandatory Fields
Authors
R Fischer, A Bock, M Dunne, JC Fuchs, L Giannone, K Lackner, PJ Mc Carthy, E Poli, R Preuss, M Rampp, M Schubert, J Stober, W Suttrop, G Tardini, M Weiland
Year
2016
Month
April
Journal
Fusion Science and Technology
Title
Coupling of the Flux Diffusion Equation with the Equilibrium Reconstruction at ASDEX Upgrade
Status
Published
Times Cited
()
Optional Fields
Keywords
Tokamak equilibrium reconstruction; Grad-Shafranov equation; current diffusion equation
Volume
69
Issue
2
Start Page
526
End Page
536
Abstract
A tokamak equilibrium reconstruction can benefit much from internal measurements of the current distribution. If lacking robust internal measurements, the reconstruction will be ill posed in the plasma core, not allowing for a sensible estimation of the current distribution. Such deficiencies can be compensated for by modeling the current distribution evolution by employing the current diffusion equation between successive equilibria. A scheme for the coupling of the predictive current diffusion equation with the equilibrium reconstruction from an inverse Grad-Shafranov equilibrium solver minimizing a least-squares criterion on measured and modeled data is proposed. The scheme is intended for routine equilibrium analysis shortly after the discharge where all diagnostic data are available. Results from the implementation at ASDEX Upgrade are shown, applied to a reversed-shear plasma with counter-current electron cyclotron current drive and to the start-up phase of the plasma. Results are compared to TRANSP calculations.
Publisher Location
American Nuclear Society
ISBN / ISSN
Edition
URL
DOI Link
10.13182/FST15-185
Grant Details
Funding Body
Grant Details