MAST neutral beam long pulse upgrade

• Published in: Fusion engineering and design Vol. 74; no. 1; pp. 403 - 407
• Main Authors: Gee, S.J., Baldwin, R., Borthwick, A., Ciric, D., Crawford, G., Hackett, L., Homfray, D., Martin, D., Milnes, J., Mutters, T., Simmonds, M., Smith, R., Stephen, R., Stevenson, P., Surrey, E., Waldon, C., Warder, S., Whitehead, A., Young, D.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01-11-2005; New York, NY Elsevier Science
• Subjects: Applied sciences; Controled nuclear fusion plants; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Installations for energy generation and conversion: thermal and electrical energy; Neutral beam injection; Neutral beams; Plasma heating; Spherical tokamak; Neutral beams; Neutral beam injection; Plasma heating; Spherical tokamak; Deuterium; Tokamak; Plasma; Nuclear fusion reactor; Neutral beam; Hydrogen; Ion source
• ISSN: 0920-3796; 1873-7196
• DOI: 10.1016/j.fusengdes.2005.06.094

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.
In addition 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.