Traverse Focusing of Intense Charged Particle Beams with Chromatic Effects for Heavy Ion Fusion
Authors: James M. Mitrani, Igor D. Kaganovich, Ronald C. Davidson
Abstract:
A fi nal focusing scheme designed to minimize chromatic effects is discussed. The Neutralized Drift Compression
Experiment-II (NDCX-II) will apply a velocity tilt for longitudinal bunch compression, and a fi nal focusing solenoid
(FFS) for transverse bunch compression. In the beam frame, neutralized drift compression causes a sufficiently large
spread in axial momentum, pz , resulting in chromatic effects to the fi nal focal spot during transverse bunch compression.
Placing a weaker solenoid upstream of a stronger fi nal focusing solenoid (FFS) mitigates chromatic effects and improves
transverse focusing by a factor of approximately 2-4 for appropriate NDCX-II parameters.
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Presented at: 54th APS Division of Plasma Physics Conference, Providence, RI (October 2012)
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Download PPPL-4846 (pdf 1.98 MB 5 pp)
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