Journal article
Gyrokinetic electrostatic turbulence close to marginality in the Wendelstein 7-X stellarator
- Abstract:
- The transition from strong (fluidlike) to nearly marginal (Floquet-type) regimes of ion-temperature-gradient (ITG) driven turbulence is studied in the stellarator Wendelstein 7-X by means of numerical simulations. Close to marginality, extended (along magnetic field lines) linearly unstable modes are dominant, even in the presence of kinetic electrons, and provide a drive that results in finite turbulent transport. A total suppression of turbulence above the linear stability threshold of the ITG modes, commonly present in tokamaks and known as the “Dimits shift,” is not observed. We show that this is mostly due to the peculiar radial structure of marginal turbulence, which is more localized than in the fluid case and therefore less likely to be stabilized by shearing flows.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, pdf, 1.0MB, Terms of use)
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- Publisher copy:
- 10.1103/physreve.106.l013202
Authors
- Publisher:
- American Physical Society
- Journal:
- Physical Review E More from this journal
- Volume:
- 106
- Article number:
- L013202
- Publication date:
- 2022-07-25
- Acceptance date:
- 2022-07-07
- DOI:
- EISSN:
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2470-0053
- ISSN:
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2470-0045
- Language:
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English
- Keywords:
- Pubs id:
-
1272476
- Local pid:
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pubs:1272476
- Deposit date:
-
2022-08-04
Terms of use
- Copyright holder:
- Zocco et l.
- Copyright date:
- 2022
- Rights statement:
- ©2022 The Author(s). Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Open access publication funded by the Max Planck Society.
- Licence:
- CC Attribution (CC BY)
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