36 citations · 108 across the 10 of their papers we have counts for
10 papers
Radial transport of electric current by electromagnetic microturbulence in tokamaks
Haomin Sun, Toby Adkins, Justin Ball +1
The turbulent transport of toroidal angular momentum helps determine the rotation profiles of tokamak plasmas, and thereby their confinement and stability. The electron contributio…
A Transport Theory of Turbulent Coronal Heating in General Geometry
Jonathan Squire, Benjamin D. G. Chandran, Toby Adkins +3
Magnetic geometry shapes how turbulence transports and dissipates energy in strongly magnetized plasmas. The solar corona, a maze of open and closed flux tubes with sharp transvers…
Turbulent heating in collisionless low-beta plasmas: imbalance, Landau damping, and electron-ion energy partition
T. Adkins, R. Meyrand, J. Squire
An understanding of how turbulent energy is partitioned between ions and electrons in weakly collisional plasmas is crucial for modelling many astrophysical systems. Using theory a…
The gyrokinetic field invariant and electromagnetic temperature-gradient instabilities in `good-curvature' plasmas
P. G. Ivanov, P. Luhadiya, T. Adkins +1
Curvature-driven instabilities are ubiquitous in magnetised fusion plasmas. By analysing the conservation laws of the gyrokinetic system of equations, we demonstrate that the well-…
Scale invariance and critical balance in electrostatic drift-kinetic turbulence
T. Adkins, P. G. Ivanov, A. A. Schekochihin
The equations of electrostatic drift kinetics are observed to possess a symmetry associated with their intrinsic scale invariance. Under the assumptions of spatial periodicity, sta…
An analytical form of the dispersion function for local linear gyrokinetics in a curved magnetic field
P. G. Ivanov, T. Adkins
Starting from the equations of collisionless linear gyrokinetics for magnetised plasmas with an imposed inhomogeneous magnetic field, we present the first known analytical, closed-…
Electromagnetic instabilities and plasma turbulence driven by electron-temperature gradient
T. Adkins, A. A. Schekochihin, P. G. Ivanov +1
Electromagnetic (EM) instabilities and turbulence driven by the electron-temperature gradient are considered in a local slab model of a tokamak-like plasma. The model describes per…
Collisionless relaxation of a Lynden-Bell plasma
Robert J. Ewart, Andrew Brown, Toby Adkins +1
Plasmas whose Coulomb-collision rates are very small may relax on shorter time scales to non-Maxwellian quasi-equilibria, which, nevertheless, have a universal form, with dependenc…
Extended electron tails in electrostatic microinstabilities and the nonadiabatic response of passing electrons
M. R. Hardman, F. I. Parra, C. Chong +6
Ion-gyroradius-scale microinstabilities typically have a frequency comparable to the ion transit frequency. Due to the small electron-to-ion mass ratio and the large electron trans…
A solvable model of Vlasov-kinetic plasma turbulence in Fourier-Hermite phase space
T. Adkins, A. A. Schekochihin
A class of simple kinetic systems is considered, described by the 1D Vlasov-Landau equation with Poisson or Boltzmann electrostatic response and an energy source. Assuming a stocha…