Publications (41)
Magnetic compressibility and ion-temperature-gradient-driven microinstabilities in magnetically confined plasmas
A. Zocco, P. Helander, J. W. Connor
The electromagnetic theory of the strongly driven ion-temperature-gradient (ITG) instability in magnetically confined toroidal plasmas is developed. Stabilizing and destabilizing e…
Collisionless microinstabilities in stellarators III - the ion-temperature-gradient mode
G. G. Plunk, P. Helander, P. Xanthopoulos +1
We investigate the linear theory of the ion-temperature-gradient (ITG) mode, with the goal of developing a general understanding that may be applied to stellarators. We highlight t…
Effect of plasma elongation on current dynamics during tokamak disruptions
T. Fülöp, P. Helander, O. Vallhagen +6
Plasma terminating disruptions in tokamaks may result in relativistic runaway electron beams with potentially serious consequences for future devices with large plasma currents. In…
The maximum- property in quasi-isodynamic stellarators
E. Rodriguez, P. Helander, A. G. Goodman
Some stellarators tend to benefit from favourable average magnetic curvature for trapped particles when the plasma pressure is sufficiently high. This so-called maximum--propert…
Drift of ablated material after pellet injection in a tokamak
O. Vallhagen, I. Pusztai, P. Helander +2
Pellet injection is used for fuelling and controlling discharges in tokamaks, and it is foreseen in ITER. During pellet injection, a movement of the ablated material towards the lo…
A single-field-period quasi-isodynamic stellarator
R. Jorge, G. G. Plunk, M. Drevlak +4
A single-field-period quasi-isodynamic stellarator configuration is presented. This configuration, which resembles a twisted strip, is obtained by the method of direct construction…