Interaction between an injected REB and a tokamak plasma

A REB (500kV, 13kA, 40nsec) was injected and trapped in a tokamak plasma (n ∼ 1–3 × 10¹³ cm⁻³, Te ∼ 60eV). Diamagnetic e measurement showed an increase of the energy density of 6.4 × 10¹⁵ eV cm⁻³ in the plasma. A shift of the current channel was observed. The heating efficiency seemed to be limited by limitation of the injected beam current due to insufficient charge neutralization and the shift of the current channel.