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Physical mechanism behind and access to the I-mode confinement regime in tokamaks.
- Source :
-
Nuclear Fusion . Sep2020, Vol. 60 Issue 9, p1-10. 10p. - Publication Year :
- 2020
-
Abstract
- The I-mode is an attractive confinement regime for future tokamak based fusion reactors. A model is presented which explains the I-mode regime by the reduction of ITG turbulence near the separatrix at low collisionality, where the separatrix ion temperature can exceed the electron temperature. Drift-Alfvén-turbulence develops, with large and small-scale fluctuations being suppressed by phase randomization and finite-Larmor-radius effects, respectively. The intermediate scales form a broad peak in the frequency spectrum, which features the same properties as the characteristic weakly coherent mode. The model, which is studied by means of gyro-fluid simulations, reproduces a number of other experimental I-mode observations, such as decoupled energy and particle transport, intermittent turbulent bursts with precursors, an operational window widening with magnetic field strength, and the challenges met when detaching the plasma. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00295515
- Volume :
- 60
- Issue :
- 9
- Database :
- Academic Search Index
- Journal :
- Nuclear Fusion
- Publication Type :
- Academic Journal
- Accession number :
- 145383891
- Full Text :
- https://doi.org/10.1088/1741-4326/ab9e17