71 citations · 990 across the 59 of their papers we have counts for
6 papers · 2 filters
Radial transport of toroidal angular momentum in tokamaks
Ivan Calvo, Felix I. Parra
The radial flux of toroidal angular momentum is needed to determine tokamak intrinsic rotation profiles. Its computation requires knowledge of the gyrokinetic distribution function…
Less constrained omnigeneous stellarators
Felix I. Parra, Ivan Calvo, Per Helander +1
A stellarator is said to be omnigeneous if all particles have vanishing average radial drifts. In omnigeneous stellarators, particles are perfectly confined in the absence of turbu…
Equivalence of two independent calculations of the higher order guiding center Lagrangian
F. I. Parra, I. Calvo, J. W. Burby +2
The difference between the guiding center phase-space Lagrangians derived in [J.W. Burby, J. Squire, and H. Qin, Phys. Plasmas {\bf 20}, 072105 (2013)] and [F.I. Parra, and I. Calv…
Flow damping in stellarators close to quasisymmetry
Ivan Calvo, Felix I. Parra, J. L. Velasco +1
Quasisymmetric stellarators are a type of optimized stellarators for which flows are undamped to lowest order in an expansion in the normalized Larmor radius. However, perfect quas…
Optimizing stellarators for large flows
Ivan Calvo, Felix I. Parra, J. Arturo Alonso +1
Plasma flow is damped in stellarators because they are not intrinsically ambipolar, unlike tokamaks, in which the flux-surface averaged radial electric current vanishes for any val…
When omnigeneity fails
Felix I. Parra, Ivan Calvo, Jose Luis Velasco +1
A generic non-symmetric magnetic field does not confine magnetized charged particles for long times due to secular magnetic drifts. Stellarator magnetic fields should be omnigeneou…