期刊
PLASMA PHYSICS AND CONTROLLED FUSION
卷 57, 期 6, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0741-3335/57/6/065008
关键词
slab theory; gyrokinetic turbulence; microtearing modes
资金
- European Union's Horizon 2020 research and innovation programme [633053]
- RCUK Energy Programme [EP/I501045]
- Fundaca para a Ciencia e Tecnologia [Pest-OE/SADG/LA0010/2011, IF/00530/2013, PTDC/FIS/118187/2010]
- JSPS KAKENHI [24740373]
- EPSRC [EP/I500987/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/I500987/1] Funding Source: researchfish
- Fundação para a Ciência e a Tecnologia [PTDC/FIS/118187/2010] Funding Source: FCT
- Grants-in-Aid for Scientific Research [24740373] Funding Source: KAKEN
The problem of the linear microtearing mode in a slab magnetised plasma, and its connection to kinetic reconnecting modes, is addressed. Electrons are described using a novel hybrid fluid-kinetic model that captures electron heating, ions are gyrokinetic. Magnetic reconnection can occur as a result of either electron conductivity and inertia, depending on which one predominates. We eschew the use of an energy dependent collision frequency in the collisional operator model, unlike previous works. A model of the electron conductivity that matches the weakly collisional regime to the exact Landau result at zero collisionality and gives the correct electron isothermal response far from the reconnection region is presented. We identify in the breaking of the constant-A(parallel to) approximation the necessary condition for microtearing instability in the collisional regime. Connections with the theory of collisional non-isothermal (or semicollisional) and collisionless tearing-parity electron temperature gradient driven (ETG) modes are elucidated.
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