110 citations · 871 across the 34 of their papers we have counts for
6 papers · 1 filter
Electrostatic stability of electron-positron plasmas in dipole geometry
Alexey Mishchenko, Gabriel Plunk, Per Helander
The electrostatic stability of electron-positron plasmas is investigated in the point-dipole and Z-pinch limits of dipole geometry. The kinetic dispersion relation for sub-bounce-f…
Gyrokinetic Stability of Electron-Positron-Ion Plasmas
Alexey Mishchenko, Alessandro Zocco, Per Helander +1
The gyrokinetic stability of electron-positron plasmas contaminated by ion (proton) admixture is studied in slab geometry. The appropriate dispersion relation is derived and solved…
Collisionless microinstabilities in stellarators. IV. The ion-driven trapped-electron mode
G. G. Plunk, J. W. Connor, P. Helander
Optimised stellarators and other magnetic-confinement devices having the property that the average magnetic curvature is favourable for all particle orbits are called maximum- d…
Impurity transport and bulk ion flow in a mixed collisionality stellarator plasma
Sarah L. Newton, Per Helander, Albert Mollén +1
The accumulation of impurities in the core of magnetically confined plasmas, resulting from standard collisional transport mechanisms, is a known threat to their performance as fus…
Available energy and ground states of collisionless plasmas
Per Helander
The energy budget of a collisionless plasma subject to electrostatic fluctuations is considered, and the excess of thermal energy over the minimum accessible to it under various co…
Stellarator bootstrap current and plasma flow velocity at low collisionality
P. Helander, F. I. Parra, S. L. Newton
The bootstrap current and flow velocity of a low-collisionality stellarator plasma are calculated. As far as possible, the analysis is carried out in a uniform way across all low-c…