2007•OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information)Open access
DESIGN AND PERFORMANCE OF THE MATCHING BEAMLINE BETWEEN THE BNL EBIS AND AN RFQ.
James G. Alessi, Edward N Beebe, J. Brodowski, Ahovi Kponou, Masahiro Okamura, Alexander Pikin, D. Raparia, John Ritter, Louis P. Snydstrup, V. Zajic
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Abstract
A part of a new EBIS-based heavy ion preinjector, the low energy beam transport (LEBT) section between the high current EBIS and the RFQ is a challenging design, because it must serve many functions. In addition to the requirement to provide an efficient matching between the EBIS and the RFQ, this line must serve as a fast ''switchyard'', allowing singly charged ions from external sources to be transported into the EBIS trap region, and extracted, highly charged ions to be deflected to off-axis diagnostics (time-of-flight or emittance). The space charge of the 5-10 mA extracted heavy ion beam is a major consideration in the design, and the space charge force varies for different ion beams having Q/m from 1-0.16. The line includes electrostatic lenses, spherical and parallel-plate deflectors, magnetic solenoid, and diagnostics for measuring current, charge state distributions, emittance, and profile. A prototype of this beamline has been built, and results of tests are presented.
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