87 citations · 1.2k across the 60 of their papers we have counts for
7 papers · 1 filter
Radially global computation of neoclassical phenomena in a tokamak pedestal
Matt Landreman, Felix I Parra, Peter J Catto +2
Conventional radially-local neoclassical calculations become inadequate if the radial gradient scale lengths of the H-mode pedestal become as small as the poloidal ion gyroradius.…
Extension of gyrokinetics to transport time scales
Felix I. Parra
Gyrokinetic simulations have greatly improved our theoretical understanding of turbulent transport in fusion devices. Most gyrokinetic models in use are delta-f simulations in whic…
A current driven electromagnetic mode in sheared and toroidal configurations
István Pusztai, Peter J. Catto, Felix I. Parra +1
The induced electric field in a tokamak drives a parallel electron current flow. In an inhomogeneous, finite beta plasma, when this electron flow is comparable to the ion thermal s…
Conditions for up-down asymmetry in the core of tokamak equilibria
Paulo Rodrigues, Nuno F. Loureiro, Justin Ball +1
A local magnetic equilibrium solution is sought around the magnetic axis in order to identify the key parameters defining the magnetic-surface's up-down asymmetry in the core of to…
Stellarators close to quasisymmetry
Ivan Calvo, Felix I. Parra, J. L. Velasco +1
Rotation is favorable for confinement, but a stellarator can rotate at high speeds if and only if it is sufficiently close to quasisymmetry. This article investigates how close it…
Intrinsic rotation driven by non-Maxwellian equilibria in tokamak plasmas
M. Barnes, F. I. Parra, J. P. Lee +3
The effect of small deviations from a Maxwellian equilibrium on turbulent momentum transport in tokamak plasmas is considered. These non-Maxwellian features, arising from diamagnet…
Turbulent momentum pinch of diamagnetic flows in a tokamak
Jungpyo Lee, Felix I. Parra, Michael Barnes
The ion toroidal rotation in a tokamak consists of an flow due to the radial electric field and a diamagnetic flow due to the radial pressure gradient. The turbulent pi…