Fuelling of deuterium–tritium plasma by peripheral pellets in JET experiments

Abstract

A baseline scenario of deuterium-tritium (D-T) plasma with peripheral high field side fuelling pellets has been produced on JET in order to mimic the situation in ITER. The isotope mix ratio is controlled in order to target the value of 50%-50% by combination of tritium gas puffing and deuterium pellet injection. Multiple factors controlling the fuelling efficiency of individual pellets are analysed with following findings: (1) prompt particle losses due to pellet triggered ELMs are detected, (2) plasmoids drift velocity might be smaller than predicted by simulation, (3) post-pellet particle loss is controlled by transient ELMy phases. Overall pellet particle flux normalised to heat flux is similar to that in previous pellet fuelling experiments on AUG and JET.