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Title: Extractor configurations for a heavy ion fusion volume source

Abstract

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.

Authors:
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Director. Office of Science. Office of Fusion Energy Sciences (US)
OSTI Identifier:
840220
Report Number(s):
LBNL-44004; HIFAN 981
R&D Project: Z41001; TRN: US0501873
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Conference
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
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 43 PARTICLE ACCELERATORS; ACCELERATORS; BREAKDOWN; BRIGHTNESS; CURRENT DENSITY; DESIGN; FOCUSING; HEAVY IONS; PULSE RISE TIME

Citation Formats

Anderson, O A. Extractor configurations for a heavy ion fusion volume source. United States: N. p., 2004. Web.
Anderson, O A. Extractor configurations for a heavy ion fusion volume source. United States.
Anderson, O A. 2004. "Extractor configurations for a heavy ion fusion volume source". United States. https://www.osti.gov/servlets/purl/840220.
@article{osti_840220,
title = {Extractor configurations for a heavy ion fusion volume source},
author = {Anderson, O A},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/840220}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Aug 30 00:00:00 EDT 2004},
month = {Mon Aug 30 00:00:00 EDT 2004}
}

Conference:
Other availability
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