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Phys Rev E Stat Nonlin Soft Matter Phys. 2008 Mar;77(3 Pt 2):036407. Epub 2008 Mar 18.

Lateral movement of a laser-accelerated proton source on the target's rear surface.

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1
Institute of Laser Engineering, Osaka University, Suita, Osaka, Japan. nakamura.tatsufumi@jaea.go.jp

Abstract

The spatial dependence of proton acceleration at the rear surface of a target that is irradiated by high-contrast and ultraintense laser pulses is investigated. Lateral movement of the proton acceleration position at the rear surface is observed; this is tested by a two-pinhole measurement which results in the observation of protons with a narrow energy band. This drifting is only observed when relativistic-intensity laser pulses irradiate targets with a small preplasma at oblique incidence, as is confirmed by two-dimensional particle-in-cell simulations. This scenario of proton acceleration by the fast-moving sheath field leads to energy selection of the accelerated protons as a function of observing position.

PMID:
18517533
DOI:
10.1103/PhysRevE.77.036407
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