Author/Authors :
Gee، نويسنده , , S.J. and Baldwin، نويسنده , , R. and Borthwick، نويسنده , , A. and Ciric، نويسنده , , D. and Crawford، نويسنده , , G. and Hackett، نويسنده , , L. and Homfray، نويسنده , , D. and Martin، نويسنده , , D. and Milnes، نويسنده , , J. and Mutters، نويسنده , , T. and Simmonds، نويسنده , , M. and Smith، نويسنده , , Melanie R. and Stephen، نويسنده , , R. and Stevenson، نويسنده , , P. and Surrey، نويسنده , , E. and Waldon، نويسنده , , C. and Warder، نويسنده , , S. and Whitehead، نويسنده , , A. and Young، نويسنده , , D.، نويسنده ,
Abstract :
Until summer 2003 two Neutral Beam Injectors (NBI), each equipped with one duopigatron ion source on loan from Oak Ridge National Laboratory (ORNL), were delivering up to 3 MW of deuterium neutral beam power into the Mega Amp Spherical Tokamak (MAST) plasma for a duration of up to 300 ms. The two ORNL injectors are now being replaced with JET type Positive Ion Neutral Injectors (PINIs). The MAST PINI design is a modification of the JET high current tetrode injector, with nominal deuterium beam voltage and current of 75 kV and 65 A, respectively. Each injector will deliver up to 2.5 MW of deuterium neutral beam power (in excess of 1 MW in hydrogen) for pulse lengths of up to 5 s.
ition to the replacement of the two injectors, many other components of the MAST NBI system are being replaced or modified. The various design issues of the upgraded MAST NBI system are addressed.
Keywords :
Neutral beam injection , Neutral beams , Plasma heating , Spherical tokamak
