Collimated quasi-monoenergetic protons from interaction of two intersecting lasers with thin double-layer target

The acceleration of protons from the interaction of two intersecting laser pulses in a double-layer target, consisting of a carbon slab with a thin hydrogen layer behind it, is investigated. It is found that a bunch of well-collimated, up to 270 MeV, quasi-monoenergetic protons can be generated. The...

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Veröffentlicht in:Physics of plasmas 2019-03, Vol.26 (3)
Hauptverfasser: Tong, Sheng-Fei, Sheng, Zheng-Mao, Yu, M. Y.
Format: Artikel
Sprache:eng
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Zusammenfassung:The acceleration of protons from the interaction of two intersecting laser pulses in a double-layer target, consisting of a carbon slab with a thin hydrogen layer behind it, is investigated. It is found that a bunch of well-collimated, up to 270 MeV, quasi-monoenergetic protons can be generated. The affected target electrons are heated and accelerated forward by the laser pulses so that the target gradually becomes transparent as the lasers bore into it. Eventually, the thin target becomes fully transparent. The converging laser pulses can then pass through it and the hot backside electron cloud, together with the electrons trapped in them. As a result, behind the target, an inhomogeneous sheath electric field is formed, which not only accelerates the protons but also merges them into a quasi-monoenergetic bunch with low divergence. The energy and spatial spread of the bunch, as well as the peak energy, can be controlled by manipulating the locations of the two lasers.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.5087768