Further development of low noise MEVVA ion source
Based on the idea of a space-charge-limited mode of operation, the influence of a pair of electrostatic meshes on the beam parameters of the LBNL MEVVA-5 ion source was investigated. The meshes were placed in the expansion zone of the vacuum arc plasma. Apart from reducing the level of beam current fluctuations, this mode of operation provides significant control over the ion charge state distribution of the extracted beam. These effects can be understood taking not only space charge but also the high-directed ion drift velocities into account that are the same for different ion charge states of a material. The results of simulations of the processes involved are in good agreement with the experimental results.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Director, Office of Science; The Russian Foundation of Basic Research under Grant No. 99-02-18163. (US)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 788041
- Report Number(s):
- LBNL-47843; R&D Project: Z2C084; TRN: AH200135%%168
- Resource Relation:
- Conference: 9th International Conference on Ion Sources (ICIS 01), Oakland, CA (US), 09/03/2001--09/07/2001; Other Information: PBD: 28 Aug 2001
- Country of Publication:
- United States
- Language:
- English
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