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Title: Parametric study of high-energy ring-shaped electron beams from a laser wakefield accelerator

Journal Article · · New Journal of Physics
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Abstract Laser wakefield accelerators commonly produce on-axis, low-divergence, high-energy electron beams. However, a high charge, annular shaped beam can be trapped outside the bubble and accelerated to high energies. Here we present a parametric study on the production of low-energy-spread, ultra-relativistic electron ring beams in a two-stage gas cell. Ring-shaped beams with energies higher than 750 MeV are observed simultaneously with on axis, continuously injected electrons. Often multiple ring shaped beams with different energies are produced and parametric studies to control the generation and properties of these structures were conducted. Particle tracking and particle-in-cell simulations are used to determine properties of these beams and investigate how they are formed and trapped outside the bubble by the wake produced by on-axis injected electrons. These unusual femtosecond duration, high-charge, high-energy, ring electron beams may find use in beam driven plasma wakefield accelerators and radiation sources.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
Cockcroft Institute; Engineering and Physical Sciences Research Council (EPSRC); EuCARD-2; European Union (EU); John Adams Institute; Ministry of Science, Technology and Higher Education, Portugal; USDOE; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-76SF00515; AC52-07NA27344; NA0002372
OSTI ID:
1843520
Report Number(s):
LLNL-JRNL-834933
Journal Information:
New Journal of Physics, Journal Name: New Journal of Physics Journal Issue: 1 Vol. 24; ISSN 1367-2630
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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