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Title: Enhancing proton acceleration by using composite targets

Efficient laser ion acceleration requires high laser intensities, which can only be obtained by tightly focusing laser radiation. In the radiation pressure acceleration regime, where the tightly focused laser driver leads to the appearance of the fundamental limit for the maximum attainable ion energy, this limit corresponds to the laser pulse group velocity as well as to another limit connected with the transverse expansion of the accelerated foil and consequent onset of the foil transparency. These limits can be relaxed by using composite targets, consisting of a thin foil followed by a near critical density slab. Such targets provide guiding of a laser pulse inside a self-generated channel and background electrons, being snowplowed by the pulse, compensate for the transverse expansion. The use of composite targets results in a significant increase in maximum ion energy, compared to a single foil target case.
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Publication Date:
OSTI Identifier:
Report Number(s):
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review ST Accelerators and Beams
Physical Review ST Accelerators and Beams
Research Org:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org:
Accelerator & Fusion Research Division
Country of Publication:
United States
PACS numbers: 52.25.Os, 52.38.Kd, 52.27.Ny