Journal
PHYSICAL REVIEW LETTERS
Volume 103, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.015003
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Funding
- U.S. DOE Center for Multiscale Plasma Dynamics
- STFC
- Leverhulme Trust Network for Magnetized Plasma Turbulence
- EPSRC [EP/G003955/1] Funding Source: UKRI
- STFC [ST/F002505/2] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G003955/1] Funding Source: researchfish
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Electrostatic turbulence in weakly collisional, magnetized plasma can be interpreted as a cascade of entropy in phase space, which is proposed as a universal mechanism for dissipation of energy in magnetized plasma turbulence. When the nonlinear decorrelation time at the scale of the thermal Larmor radius is shorter than the collision time, a broad spectrum of fluctuations at sub-Larmor scales is numerically found in velocity and position space, with theoretically predicted scalings. The results are important because they identify what is probably a universal Kolmogorov-like regime for kinetic turbulence; and because any physical process that produces fluctuations of the gyrophase-independent part of the distribution function may, via the entropy cascade, result in turbulent heating at a rate that increases with the fluctuation amplitude, but is independent of the collision frequency.
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