Experimental database and design concept for a 1-MW, 200-keV neutral beam line based on a SITEX negative ion source
Scaling studies for a SITEX negative ion source to produce 200-keV, 10-A, long pulse D/sup -/ beams are under way at Oak Ridge National Laboratory (ORNL). Designs have been restricted to the use of established techniques and reasonably welldemonstrated scaling. The results show that the 1-A SITEX source can be directly scaled to produce 200-keV, 10-A long pulse ion beams with a source power efficiency of less than or equal to5 kW of total plasma generator power per ampere of D/sup -/ beam generated. Extracted electron-to-D/sup -/ ratios should be less than or equal to0.06, with all extracted electrons recovered at less than or equal to10% of the first gap potential energy difference. The close-coupled accelerating structure will be 5 cm long and have five electrodes with 21 slits each, with a 50-kV/cm field in each gap. No decel electrode was included because of the transverse magnetic field. Electrons formed in each gap by the about16% charge-exchange loss of D/sup -/ in the total accelerator column will be collected by electron recovery structures associated with the gaps at an average energy of 50% of a gap's potential energy difference. Atomic gas efficiency will be greater than or equal to67%. Beam divergence calculations using the ORNL optics code give theta /SUB rms/ = + or -0.4/sup 0/. The ion source magnetic field provides momentum dispersion of the extracted beam, separating out both the electrons and all heavy ion impurities and low energy D/sup 0/ particles formed by charge exchange in the accelerating column. A D/sub 2/ gas neutralization cell and a charge separation magnet provide 1 MW of D/sup 0/ beam at 200 keV for injection. The overall beam line dimensions are 2.2 X 1.0 X 5.0 m (H X W X L).
- Research Organization:
- Oak Ridge National Lab., Oak Ridge, TN 37830
- OSTI ID:
- 6203040
- Report Number(s):
- CONF-830406-; TRN: 85-002397
- Journal Information:
- Nucl. Technol./Fusion; (United States), Vol. 4:2; Conference: 5. topical meeting on technology of fusion energy, Knoxville, TN, USA, 26 Apr 1983
- Country of Publication:
- United States
- Language:
- English
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