Statistical description of collisionless alfa-particle transport in cases of broken symmetry: from ITER to quasi-toroidally symmetric stellarators

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dc.contributor.author Gogoleva, Alena
dc.contributor.author Tribaldos Macía, Víctor
dc.contributor.author Reynolds Barredo, José Miguel
dc.contributor.author Beidler, Craig
dc.date.accessioned 2022-09-20T09:38:15Z
dc.date.available 2022-09-20T09:38:15Z
dc.date.issued 2020-05
dc.identifier.bibliographicCitation Gogoleva, A., Tribaldos, V., Reynolds-Barredo, J. M., & Beidler, C. D. (2020). Statistical description of collisionless α-particle transport in cases of broken symmetry: from ITER to quasi-toroidally symmetric stellarators. In Nuclear Fusion, 60(5), 056009-0560024
dc.identifier.issn 0029-5515
dc.identifier.uri http://hdl.handle.net/10016/35745
dc.description.abstract The confinement of alfa-particles is vital for any future fusion reactor. Unfortunately, the inevitable appearance of inhomogeneities in the magnetic field activates the non-collisional transport by virtue of ripple trapping and ripple induced stochastization. While a large and growing body of literature is devoted to the mitigation of these channels of losses for future reactor designs, far too little attention has been paid to characterize the statistical nature of the underlying stochastic process, which is generally assumed to be diffusive. Here the effect of breaking the toroidal symmetry on collisionless alfa-particle transport is analyzed numerically with a guiding center orbit following code MOCA for several configurations: a perfectly toroidally symmetric ITER-like tokamak and four stellarators with different levels of quasi-toroidal symmetry. Statistical characterization of banana widths, bouncing times and banana center evolution put into question the classical convection/diffusion approach to adequately describe collisionless alfa-particle transport as the magnetic configuration departs from toroidal symmetry.
dc.description.sponsorship The authors would like to thank R. Sanchez, A. Bustos and J. Alcuson for fruitful discussions. This work was supported in part by the Spanish project ENE2012-33219 and the Erasmus Mundus Program: International Doctoral College in Fusion Science and Engineering FUSION-DC. Part of this research was carried at the Max-Planck Institute for Plasma Physics in Greifswald (Germany), whose hospitality is gratefully acknowledged. MOCA calculations were done in Uranus, a supercomputer cluster located at Universidad Carlos III de Madrid and funded jointly by EU-FEDER and the Spanish Government via Project No. UNC313-4E-2361, ENE2009- 12213-C03-03, ENE2012-33219 and ENE2015-68265
dc.format.extent 15
dc.language.iso eng
dc.publisher IOP Publishing
dc.rights © 2020 IAEA, Vienna
dc.subject.other A-particle transport
dc.subject.other Iter
dc.subject.other Quasi-toroidal stellarator
dc.title Statistical description of collisionless alfa-particle transport in cases of broken symmetry: from ITER to quasi-toroidally symmetric stellarators
dc.type article
dc.relation.publisherversion https://iopscience.iop.org/article/10.1088/1741-4326/ab7936
dc.subject.eciencia Física
dc.identifier.doi https://doi.org/10.1088/1741-4326/ab7936
dc.rights.accessRights openAccess
dc.relation.projectID Gobierno de España. ENE2009-12213-C03-03
dc.relation.projectID Gobierno de España. ENE2012-33219
dc.relation.projectID Indefinido. UNC313-4E-2361
dc.relation.projectID Gobierno de España. ENE2015-68265-P
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 056009
dc.identifier.publicationissue 5
dc.identifier.publicationlastpage 056024
dc.identifier.publicationtitle NUCLEAR FUSION
dc.identifier.publicationvolume 60
dc.identifier.uxxi AR/0000025725
dc.contributor.funder Ministerio de Economía y Competitividad (España)
dc.contributor.funder Universidad Carlos III de Madrid
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