Pellet Fueling of JET Plasmas During Ohmic, ICRF and NBI Heating

摘要

Pellet fueling experiments have been performed on JET using a single-shot pneumatic injector giving 4.6mm (4.5 x 10 sup 21 D atoms) and 3.6mm (2.2 x 10 sup 21 D atoms) diameter cylindrical deuterium pellets with velocity 0.8 less than or equal to V(km.s sup -1 ) less than or equal to 1.2. Z/sub eff/ < 1.5 with n/sub D//n/sub e/ approx. 1 on axis has been achieved. In configurations with a magnetic seperatrix, peaked electron density profiles with n/sub e/(o)/anti n/sub e/ approx. 2 are obtained, with n/sub e/(0) approx. = 1.2 x 10 sup 20 m sup -3 and T/sub e/(0) approx. = 1keV. Separately, high value of n/sub D/(0)tau/sub E/T/sub i/(0) = 1.3 x 10 sup 20 m sup -3 .s.keV at T/sub i/90) = 6.5keV has been obtained with pellet fueling followed by NBI heating. (ERA citation 12:036153)