Advances on the high speed ignitor Pellet Injector (IPI)

Abstract

The control of the density profile during the initial plasma current rise is a critical issue to optimize ohmic and fusion heating rates of Ignitor plasmas. Simulations performed with the NGS ablation model, for the reference ignition plasma parameters (ne0 ≅ ni0 ≅ 1021 m−3, Te0 ≅ Ti0 ≅ 11 keV), indicate that deuterium pellets of a few mm (≤ 4 mm) in size injected at 3–4 km/s from the low field side should ensure adequate deep fuelling.