Controlling the cross-field flux of cold α-particles with resonant magnetic perturbations in a helical fusion plasma device

Abstract

A new scenario to control transport of 'cold' α-particles in a helical fusion device by changing poloidal field coil current during plasma discharge is proposed here. A way to enhance radial transport of α-particles in the intermediate energy range is considered which relies on specific features of helical magnetic field. To remove helically trapped, cold α-particles, a β-induced change in the B/B 0 modulation along the particle trajectory is employed. To remove passing particles resonant effects connected with the poloidal field coil currents are used.

Review of stellarator/heliotron design issues towards MFE DEMO

“…One of important targets is the SDC (super-dense core) ignition plasma, in which the external heating methods such as the electron Bernstein wave (EBW) [42], fueling methods [33] and He ash removal [43] are important issues.…”

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“…3͑a͔͒, where E s =−⌬ s . Then, a significant change in the motion occurs at t ϳ 11 s. after which time, the electron becomes again a helically trapped particle and drifts outwardly, 16 even across the outermost region of the HMS. However, the electron is never lost.…”