Abstract
We present a novel, cascaded acceleration scheme for the generation of spectrally controlled ion beams using a laser-based accelerator in a ‘double-stage’ setup. An MeV proton beam produced during a relativistic laser–plasma interaction on a thin foil target is spectrally shaped by a secondary laser–plasma interaction on a separate foil, reliably creating well-separated quasi-monoenergetic features in the energy spectrum. The observed modulations are fully explained by a one-dimensional (1D) model supported by numerical simulations. These findings demonstrate that laser acceleration can, in principle, be applied in an additive manner.
Highlights
MA 02139-4307, USA. 7 Current address: Laboratoire LULI, École Polytechnique, 91128 Palaiseau CEDEX, France. 8 Current address: Institute of Environmental Physics and Remote Sensing, Universität Bremen, FB1 PO Box
An MeV proton beam produced during a relativistic laser–plasma interaction on a thin foil target is spectrally shaped by a secondary laser–plasma interaction on a separate foil, reliably creating well-separated quasi-monoenergetic features in the energy spectrum
The observed modulations are fully explained by a one-dimensional (1D) model supported by numerical simulations. These findings demonstrate that laser acceleration can, in principle, be applied in an additive manner
Summary
Beam is generated by the laser pulse P1 at the primary target foil T1 via the mechanism of target normal sheath acceleration (TNSA). At T2, a second TNSA field is generated by the appropriately delayed second laser pulse P2, imposing a characteristic spectral modulation on the primary proton beam.
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