A "lighthouse" laser-driven staged proton accelerator allowing for ultrafast angular and spectral control
arxiv(2024)
摘要
Compact laser-plasma acceleration of fast ions has made great strides since
its discovery over two decades ago, resulting in the current generation of
high-energy (≥ 100 MeV) ultracold beams over ultrashort (≤ 1
ps) durations. To unlock broader applications of these beams, we need the
ability to tailor the ion energy spectrum. Here, we present a scheme that
achieves precisely this by accelerating protons in a "lighthouse" fashion,
whereby the highest-energy component of the beam is emitted in a narrow cone,
well separated from the lower-energy components. This is made possible by a
two-stage interaction in which the rear surface of the target is first set into
rapid motion before the main acceleration phase. This approach offers the
additional advantages of leveraging a robust sheath acceleration process in
standard micron-thick targets and being optically controllable.
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