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Title: Kinetic Turbulence in Collisionless High- β Plasmas

Journal Article · · Physical Review. X
ORCiD logo [1];  [2];  [3];  [4];  [5]
  1. Institute for Advanced Study, Princeton, NJ (United States)
  2. Princeton Univ., NJ (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. University of Otago, North Dunedin (New Zealand)
  4. Princeton Univ., NJ (United States)
  5. Univ. of Oxford (United Kingdom). Clarendon Lab.; Merton College, Oxford (United Kingdom)

We present results from three-dimensional hybrid-kinetic simulations of Alfvénic turbulence in a high-β, collisionless plasma. The key feature of such turbulence is the interplay between local wave-wave interactions between the fluctuations in the cascade and the nonlocal wave-particle interactions associated with kinetic microinstabilities driven by anisotropy in the thermal pressure (namely, firehose, mirror, and ion cyclotron). We present theoretical estimates for, and calculate directly from the simulations, the effective collisionality and plasma viscosity in pressure-anisotropic high-β turbulence, demonstrating that, for strong Alfvénic turbulence, the effective parallel-viscous scale is comparable to the driving scale of the cascade. Below this scale, the kinetic-energy spectrum indicates an Alfvénic cascade with a slope steeper than –5/3 due to the anisotropic viscous stress. The magnetic-energy spectrum is shallower than –5/3 near the ion-Larmor scale due to fluctuations produced by the firehose instability. Most of the cascade energy (≈ 80%–90%) is dissipated as ion heating through a combination of Landau damping and anisotropic viscous heating. Our results have implications for models of particle heating in low-luminosity accretion onto supermassive black holes, the effective viscosity of the intracluster medium, and the interpretation of near-Earth solar-wind observations.

Research Organization:
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); University of California, Berkeley, CA (United States)
Sponsoring Organization:
USDOE; National Aeronautics and Space Administration (NASA); Marsden Fund; Engineering and Physical Sciences Research Council (EPSRC); Science and Technology Facilities Council (STFC); National Science Foundation (NSF)
Grant/Contract Number:
SC0019046; NNX17AK63G; UOO1727; EP/R034737/1; ST/W000903/1; ACI-1548562
OSTI ID:
1971529
Alternate ID(s):
OSTI ID: 1974433; OSTI ID: 1984387
Journal Information:
Physical Review. X, Vol. 13, Issue 2; ISSN 2160-3308
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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