Large area negative ion source for high voltage neutral beams
A source of negative deuterium ions in the multi-ampere range is described that is readily extrapolated to reactor size, 10 amp or more of neutral beam, that is of interest in future experiments and reactors. The negative ion source is based upon the double charge exchange process. A beam of positive ions is created and accelerated to an energy at which the attachment process D + M ..-->.. D/sup -/ + M/sup +/ proceeds efficiently. The positive ions are atomically neutralized either in D/sub 2/ or in the charge exchange medium M. Atomic species make a second charge exchange collision in the charge target to form D/sup -/. For a sufficiently thick target, the beam reaches an equilibrium fraction of negative ions. For reasons of efficiency, the target is typically alkali metal vapor; this experiment uses sodium. The beam of negative ions can be accelerated to high (>200 keV) energy, the electrons stripped from the ions, and a high energy neutral beam formed.
- Research Organization:
- California Univ., Berkeley (USA). Lawrence Berkeley Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5519250
- Report Number(s):
- LBL-10081; CONF-791102-89; TRN: 80-004884
- Resource Relation:
- Conference: 8. symposium on engineering problems of fusion research, San Francisco, CA, USA, 13 Nov 1979
- Country of Publication:
- United States
- Language:
- English
Similar Records
Formation of hydrogen negative ions by surface and volume processes with application to negative ion sources
Negative ion sources for neutral beam systems