Enhanced proton acceleration in an applied longitudinal magnetic field

Arefiev, A.; Toncian, T.; Fiksel, G.

doi:10.1088/1367-2630/18/10/105011

Title: Enhanced proton acceleration in an applied longitudinal magnetic field

Journal Article · Mon Oct 31 00:00:00 EDT 2016 · New Journal of Physics

DOI:https://doi.org/10.1088/1367-2630/18/10/105011· OSTI ID:1426149

^[1]; Toncian, T. ^[2]; Fiksel, G. ^[3]

Univ. of Texas, Austin, TX (United States). Center for High Energy Density Science
Univ. of Texas, Austin, TX (United States). Center for High Energy Density Science; Institute for Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf e.V., Dresden (Germany)
Univ. of Michigan, Ann Arbor, MI (United States)

Using two-dimensional particle-in-cell simulations, we examine how an externally applied strong magnetic field impacts proton acceleration in laser-irradiated solid-density targets. We find that a kT-level external magnetic field can sufficiently inhibit transverse transport of hot electrons in a flat laser-irradiated target. While the electron heating by the laser remains mostly unaffected, the reduced electron transport during proton acceleration leads to an enhancement of maximum proton energies and the overall number of energetic protons. The resulting proton beam is much better collimated compared to a beam generated without applying a kT-level magnetic field. A factor of three enhancement of the laser energy conversion efficiency into multi-MeV protons is another effect of the magnetic field. The required kT-level magnetic fields are becoming feasible due to a significant progress that has been made in generating magnetic fields with laser-driven coils using ns-long laser pulses. The possibility of improving characteristics of laser-driven proton beams using such fields is a strong motivation for further development of laser-driven magnetic field capabilities.

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Research Organization:: Univ. of Texas, Austin, TX (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0002008

OSTI ID:: 1426149

Journal Information:: New Journal of Physics, Vol. 18, Issue 10; ISSN 1367-2630

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 42 works

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