Scaling of H-mode energy confinement with Ip and BT in the MAST spherical tokamak

The dependences of energy confinement on plasma current and toroidal magnetic field have been investigated in the MAST spherical tokamak in H-mode plasmas. Multivariate fits show that the dependence of energy confinement time on plasma current Ip is weaker than linear while the dependence on toroida...

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Bibliographic Details
Published in:Nuclear fusion 2009-07, Vol.49 (7), p.075016-075016 (8)
Main Authors: Valovič, M, Akers, R, Cunningham, G, Garzotti, L, Lloyd, B, Muir, D, Patel, A, Taylor, D, Turnyanskiy, M, Walsh, M
Format: Article
Language:English
Subjects:
Exact sciences and technology
Magnetic confinement and equilibrium
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
Plasma properties
Tokamaks
Transport properties
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Summary:The dependences of energy confinement on plasma current and toroidal magnetic field have been investigated in the MAST spherical tokamak in H-mode plasmas. Multivariate fits show that the dependence of energy confinement time on plasma current Ip is weaker than linear while the dependence on toroidal magnetic field BT is stronger than linear, in contrast to conventional energy confinement scalings. These Ip and BT dependences have also been confirmed by single parameter scans. Transport analysis indicates that the strong BT scaling of energy confinement could possibly be explained by weaker q and stronger nu* dependence of heat diffusivity in comparison with conventional tokamaks.
ISSN:0029-5515
1741-4326
DOI:10.1088/0029-5515/49/7/075016