Valovic, M.; Garzotti, L; Gurl, C.; Akers, R.J.; Harrison, J; Michael, Clive; Naylor, G; Scannell, R; MAST Team, The
Access into H-mode is studied in the MAST tokamak when plasma is fuelled by cryogenic pellets. It is shown that pellet fuelling from the high-field side allows access to H-mode in plasmas heated by neutral beams. Simple and two-stage L-H transitions are identified. The results of comparison of the L-H transitions with pellet injection with transitions where plasmas are fuelled solely by gas puffing depend on the gas puff geometry: fuelling by high-field side gas leads to an L-H transition at...[Show more]
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