Journal
PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS
Volume 18, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevSTAB.18.081301
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Funding
- U.S. Department of Energy [DE-SC0011831, DE-AC02-07CH11359]
- Defense Threat Reduction Agency, Basic Research Award [HDTRA1-10-1-0051]
- Fermi Research Alliance, LLC
- dissertation-completion award - Graduate School of Northern Illinois University
- U.S. Department of Energy (DOE) [DE-SC0011831] Funding Source: U.S. Department of Energy (DOE)
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Collinear high-gradient O(GV/m) beam-driven wakefield methods for charged-particle acceleration could be critical to the realization of compact, cost-efficient, accelerators, e.g., in support of TeV-scale lepton colliders or multiple-user free-electron laser facilities. To make these options viable, the high accelerating fields need to be complemented with large transformer ratios >2, a parameter characterizing the efficiency of the energy transfer between a wakefield-exciting drive bunch to an accelerated witness bunch. While several potential current distributions have been discussed, their practical realization appears challenging due to their often discontinuous nature. In this paper we propose several alternative continuously differentiable (smooth) current profiles which support enhanced transformer ratios. We especially demonstrate that one of the devised shapes can be implemented in a photo-emission electron source by properly shaping the photocathode-laser pulse. We finally discuss a possible superconducting linear-accelerator concept that could produce shaped drive bunches at high-repetition rates to drive a dielectric-wakefield accelerator with accelerating fields on the order of similar to 60 MV/m and a transformer ratio similar to 5 consistent with a recently proposed multiuser free-electron laser facility.
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