Prospects for the creation of positron–electron plasmas in a non-neutral stellarator

The prospects of creating positron–electron plasmas confined in a stellarator are discussed. A pure electron plasma would be created before the positrons are introduced, to facilitate efficient injection and a long confinement time of the positrons. Gyrokinetic simulations are presented suggesting that a positron– electron plasma may be stable to low-frequency microturbulence if operated well below the Brillouin limit, and transport may be neoclassical. If this is the case, significant positron–electron plasma densities can be reached with positron sources that exist today.