Extractor configurations for a heavy ion fusion volume source
In order for volume sources to deliver the current (e.g., 0.8 A of Ar{sup +} per module) and brightness necessary for heavy ion fusion (HIF), they must operate at high current density. Conventional extractor designs for 1 to 2 MeV run into voltage breakdown limitations and cannot easily produce the required current rise time (about one microsecond). We discuss two systems that can overcome these volume-extraction problems. Each uses multichannel preaccelerators followed by a single channel main accelerator. Fast beam switching is done in the low energy beamlet stages. A new design, utilizing concentric ring preaccelerators, was recently described for another application [2]. A more conventional design uses a large number of small round beamlets. In either case, the merging beamlets are angled toward the axis, a feature that dominates other focusing. By suitable adjustment of the individual angles, beam aberrations are reduced. Because of the high current density, the overall structure is compact. Emittance growth from merging of beamlets is calculated and scaling is discussed.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Director. Office of Science. Office of Fusion Energy Sciences (US)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 840220
- Report Number(s):
- LBNL-44004; HIFAN 981; R&D Project: Z41001; TRN: US0501873
- Resource Relation:
- Conference: 1999 Particle Accelerator Conference PAC, New York, NY (US), 03/29/1999--04/02/1999; Other Information: PBD: 30 Aug 2004
- Country of Publication:
- United States
- Language:
- English
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