Mathematical equivalence of non-local transport models and broadened deposition profiles

Gerd Vandersteen, Matthijs Herman van Berkel, Hans Zwart, Egbert Westerhof, Dick Hogeweij, J. Citrin, Dries Peumans, M.R. de Baar

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Abstract

Old and recent experiments show that there is a direct response to the heating power of transport observed in modulated electron cyclotron heating (ECH) experiments both in tokamaks and stellarators, which is commonly known as non-local transport. This is most apparent for modulated experiments in stellarators such as LHD and W7-AS. We show that this power dependence and its corresponding experimental observations such as the so-called hysteresis in flux [Inagaki, NF, 113006, 2013] can be reproduced by broadened ECH deposition profiles. In other words, many mathematical models proposed to describe non-local transport are equivalent to an deposition (effective) profile in its linearized forms [vanBerkel, NF, 106042, 2018]. This also connects with new insights on microwave scattering due to density fluctuations in the edge plasma which shows that in reality the deposition profiles are much broader than expected [Chellai, PRL, 105001, 2018] but it is unclear if this effect is sufficient to explain non-local transport. These relationships can be further studied by separating the transport in a slow (diffusive) and a fast (heating/non-local) time-scale using perturbative experiments.
Original languageEnglish
Publication statusPublished - 2019
Event61st Annual Meeting of the APS Division of Plasma Physics, DPP 2019 - Fort Lauderdale, United States
Duration: 21 Oct 201925 Oct 2019
Conference number: 61
https://www.aps.org/units/dpp/meetings/meeting.cfm?name=DPP19

Conference

Conference61st Annual Meeting of the APS Division of Plasma Physics, DPP 2019
Abbreviated titleDPP 2019
CountryUnited States
CityFort Lauderdale
Period21/10/1925/10/19
Internet address

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    Vandersteen, G., van Berkel, M. H., Zwart, H., Westerhof, E., Hogeweij, D., Citrin, J., ... de Baar, M. R. (2019). Mathematical equivalence of non-local transport models and broadened deposition profiles. Poster session presented at 61st Annual Meeting of the APS Division of Plasma Physics, DPP 2019, Fort Lauderdale, United States.