Long pulse characteristics of 5 MW ion source for SST-1 neutral beam injector

• Published in: Fusion engineering and design Vol. 83; no. 5; pp. 729 - 735
• Main Authors: Jana, M.R., Mattoo, S.K., Chakraborty, A.K., Baruah, U.K., Patel, G.B., Jayakumar, P.K.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.10.2008; 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; Ion source; Long pulse; Neutral beam injector; 52.75.−d; 29.25.Lg.Ni; Long pulse; Ion source; Neutral beam injector; Nuclear fusion reactor; 52.75.-d; Neutral beam; Hydrogen; Plasma heating; Steady state
• ISSN: 0920-3796; 1873-7196
• DOI: 10.1016/j.fusengdes.2008.04.013

We present characteristics of a 5 MW ion source for SST-1 neutral beam injector. Before the source could be tested for its performance, it was conditioned by 480 arc discharges of 1 s and beam extraction of hydrogen species at various beam voltages ranging between 19 kV and 56 kV. Breakdown free beam extraction could be secured only after about 3000 beam second extraction. The ion source is capable of delivering 1.7 MW of neutral beam power at 55 kV with horizontal and vertical focal length of 5.4 m and 7 m respectively. Beam divergence is ∼0.97°. Steady-state beam energy of 31 MJ at 41 kV was achieved during 14 s long beam extraction. We have not noticed any deterioration of beam parameters, including beam divergence during long pulse operation. These results indicate that 0.5 MW of neutral beam power at 30 kV required for heating of plasma in SST-1 can be delivered.