6 papers · 1 filter
A Weakly Nonlinear Theory of Zonal-Flow Forcing in Gyrokinetic Turbulence
Georgia Acton, Eduardo Rodrìguez, Gareth Roberg-Clark +1
The forced generation of zonal flows by microinstability-driven turbulence is investigated within the framework of local gyrokinetic theory far from marginality. We use a numerical…
Near-axis quasi-isodynamic database
Eduardo Rodriguez, Gabriel G. Plunk
In this work, we investigate the landscape of quasi-isodynamic stellarators using the near-axis expansion of the magnetic field. Building on recent theoretical developments, we con…
A geometric approach to constructing quasi-isodynamic fields
G. G. Plunk, E. RodrÃguez
The near-axis theory for quasi-isodynamic stellarator equilibria is reformulated in terms of geometric inputs, to allow greater control of the ``direct construction'' of quasi-isod…
Near-axis measures of quasi-isodynamic configurations
Eduardo Rodriguez, Gabriel G Plunk
We present a number of measures and techniques to characterise and effectively construct quasi-isodynamic stellarators within the near-axis framework, without the need to resort to…
Near-axis description of stellarator-symmetric quasi-isodynamic stellarators to second order
Eduardo Rodriguez, Gabriel G. Plunk, Rogerio Jorge
The near-axis description of optimised stellarators, at second order in the expansion, provides important information about the field, both of physical and practical importance for…
The zonal-flow residual does not tend to zero in the limit of small mirror ratio
Eduardo Rodriguez, Gabriel G Plunk
The intensity of the turbulence in tokamaks and stellarators depends on its ability to excite and sustain zonal flows. Insight into this physics may be gained by studying the ''res…