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A stable relativistic ion acceleration regime for thin foils irradiated by circularly polarized laser pulses is suggested. In this regime, the "light-sail" stage of radiation pressure acceleration for ions is smoothly connected with the initial relativistic "hole-boring" stage, and a defined relationship between laser intensity I(0), foil density n(0), and thickness l(0) should be satisfied. For foils with a wide range of n(0), the required I(0) and l(0) for the regime are theoretically estimated and verified with the particle-in-cell code ILLUMINATION. It is shown for the first time by 2D simulations that high-density monoenergetic ion beams with energy above GeV/u and divergence of 10 degrees are produced by circularly polarized lasers at intensities of 10(22) W/cm(2), which are within reach of current laser systems.
Bibliographical noteThe work here was supported by EPSRC (Grants
No. EP/E035728/1 and No. EP/D/06337X/1). M. Z. acknowledges support from the Royal Society. B. Q. acknowledges useful discussion with X. T. He and C. T.
Zhou at Center for Applied Physics and Technology,
ASJC Scopus subject areas
- Physics and Astronomy(all)
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