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On the impact of temperature gradient flattening and system size on heat transport in microtearing turbulence
Resource type
Authors/contributors
- Ajay, C.J. (Author)
- McMillan, B.F. (Author)
- Pueschel, M.J. (Author)
Title
On the impact of temperature gradient flattening and system size on heat transport in microtearing turbulence
Abstract
Microtearing instability is one of the major sources of turbulent transport in high-β tokamaks. These modes lead to very localized transport at low-order rational magnetic field lines, and we show that flattening of the local electron temperature gradient at these rational surfaces plays an important role in setting the saturated flux level in microtearing turbulence. This process depends crucially on the density of rational surfaces, and thus the system-size, and gives rise to a worse-than-gyro-Bohm transport scaling for system-sizes typical of existing tokamaks and simulations.
Publication
Nuclear Fusion
Volume
63
Issue
6
Date
2023-06
ISSN
0029-5515
Accessed
9/16/24, 1:56 PM
Library Catalog
Eindhoven University of Technology research portal
Extra
3 citations (Crossref/DOI) [2024-10-03]
3 citations (Crossref/DOI) [2024-10-02]
Notes
Funding Information:
We acknowledge Tobias Goerler and Alessandro Di Siena for helping us set up global simulations. This research was funded in whole or in part by the Engineering and Physical Sciences Research Council (EPSRC), EP/R034737/1. For the purpose of open access, the author has applied a Creative Commons Attribution (CC BY) licence to any Author Accepted Manuscript version arising from this submission. We acknowledge the CINECA award under the ISCRA initiative, for the availability of high performance computing resources and support.
Citation
Ajay, C. J., McMillan, B. F., & Pueschel, M. J. (2023). On the impact of temperature gradient flattening and system size on heat transport in microtearing turbulence. Nuclear Fusion, 63(6). https://doi.org/10.1088/1741-4326/acca94
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