Quasi-symmetry and the nature of radial turbulent transport in quasi-poloidal stellarators
Publisher:
AIP Publishing
Issued date:
2016-10-01
Citation:
Alcuson, J. A., Reynolds-Barredo, J. M., Bustos, A., Sanchez, R., Tribaldos, V., Xanthopoulos, P., Goerler, T., & Newman, D. E. (2016). Quasi-symmetry and the nature of radial turbulent transport in quasi-poloidal stellarators. In Physics of Plasmas, 23(10), 102308.
ISSN:
1070-664X
xmlui.dri2xhtml.METS-1.0.item-contributor-funder:
Comunidad de Madrid
Ministerio de Economía y Competitividad (España)
Universidad Carlos III de Madrid
Sponsor:
Research funded in part by the Spanish National Project Nos. ENE2012-33219 and ENE2012-31753. Research supported in part by the DOE Office of Science Grant No. DE-FG02-04ER5741 at the University of Alaska. Research carried out in part at the Institüt für Plasmaphysik of the Max-Planck Institüt in Greifswald (Germany), whose hospitality is gratefully acknowledged. Fruitful interactions with members of the ABIGMAP research network, funded by the Spanish National Project No. MAT2015-69777-REDT, is also acknowledged. Gene simulations have been possible thanks in part to a continued grant (Nos. FI-2014-1-0021, FI-2014-2-0026, FI-2014-3-0012, and FI-2015-1-0011) to use resources from the MareNostrum supercomputer at BSC (Barcelona, Spain). Gene and TRACER runs have also been carried out in Uranus, a supercomputer cluster located at Universidad Carlos III de Madrid (Spain) funded jointly by EU FEDER funds and by the Spanish Government via the National Project Nos. UNC313-4E-2361, ENE2009-12213-C03-03, ENE2012-33219, and ENE2012-31753.
Project:
Gobierno de España. ENE2009-12213-C03-03
Gobierno de España. ENE2012-33219
Gobierno de España. ENE2012-31753
Indefinido. UNC313-4E-2361
Keywords:
Physics
,
Model
Rights:
© 2016 Author(s). Published by AIP Publishing.
Abstract:
Quasi-symmetric configurations have a better neoclassical confinement compared to that of standard stellarators. The reduction of the neoclassical viscosity along the direction of quasi-symmetry should facilitate the self-generation of zonal flows and, consequ
Quasi-symmetric configurations have a better neoclassical confinement compared to that of standard stellarators. The reduction of the neoclassical viscosity along the direction of quasi-symmetry should facilitate the self-generation of zonal flows and, consequently, the mitigation of turbulent fluctuations and the ensuing radial transport. Therefore, it is expected that quasi-symmetries should also result in better confinement properties regarding radial turbulent transport. In this paper we show that, at least for quasi-poloidal configurations, the influence of quasi-symmetry on radial transport exceeds the expected reduction of fluctuation levels and associated effective transport coefficients, and that the intimate nature of transport itself is affected. In particular, radial turbulent transport becomes increasingly subdiffusive as the degree of quasi-symmetry becomes larger. This behavior is somewhat reminiscent of what has been previously reported in tokamaks with strong radially sheared zonal flows. Published by AIP Publishing.
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