Dependence of laser accelerated protons on laser energy following the interaction of defocused, intense laser pulses with ultra-thin targets

Brenner, C. M.; Green, J.S.; Robinson, A. P. L.; Carroll, D. C.; Dromey, B.; Foster, P. S.; Kar, S.; Li, Y.T.; Markey, K.; Spindloe, C.; Streeter, M. J. V.; Tolley, M.; Wahlström, C.-G.; Xu, Ming; Zepf, Matthew; McKenna, P.; Neely, D.

doi:10.1017/s0263034611000395

Cited by 28 publications

(23 citation statements)

References 28 publications

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“…However, this reduction was smaller for a given intensity than that demonstrated when the target was kept at best focus and the laser energy reduced. This measurement of the maximum proton energy is consistent with the data found by Brenner et al [4,5] for shorter pulse laser conditions. Measurements of the divergence of the electrons were also conducted by Coury et al using the K-alpha x-rays from the rear surface.…”

Section: Introductionsupporting

confidence: 92%

Escaping Electrons from Intense Laser-Solid Interactions as a Function of Laser Spot Size

Rusby

Gray

Butler

et al. 2018

EPJ Web of Conferences

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Abstract. The interaction of a high-intensity laser with a solid target produces an energetic distribution of electrons that pass into the target. These electrons reach the rear surface of the target creating strong electric potentials that act to restrict the further escape of additional electrons. The measurement of the angle, flux and spectra of the electrons that do escape gives insights to the initial interaction. Here, the escaping electrons have been measured using a differentially filtered image plate stack, from interactions with intensities from mid 10 20 -10 17 W/cm 2 , where the intensity has been reduced by defocussing to increase the size of the focal spot. An increase in electron flux is initially observed as the intensity is reduced from 4x10 20 to 6x10 18 W/cm 2 . The temperature of the electron distribution is also measured and found to be relatively constant. 2D particle-in-cell modelling is used to demonstrate the importance of pre-plasma conditions in understanding these observations.

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Section: Introductionsupporting

confidence: 92%

Escaping Electrons from Intense Laser-Solid Interactions as a Function of Laser Spot Size

Rusby

Gray

Butler

et al. 2018

EPJ Web of Conferences

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“…Brenner et al 18 investigated the effect of the focal size separately using the high contrast Astra laser (to exclude the ASE effect). By comparing the datasets with the same laser intensity and different focal size, we can see that the maximum energy and the proton flux are closely related to the spot diameter.…”

mentioning

confidence: 99%

Enhancement of ion generation in femtosecond ultraintense laser-foil interactions by defocusing

Carroll

et al. 2012

Applied Physics Letters

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“…cal spot size and at the intensity of interest in this work (10 16 W/cm 2 ), it is considered that the TNSA is the dominant regime [5]. It can occur at lower irradiances, that is, of the order of 10 15-16 W/cm 2 and sub-nanosecond pulse duration producing ion acceleration in the forward direction.…”

Section: Multi-energy Ion Implantation From High-intensity Lasermentioning

confidence: 99%

Multi-energy ion implantation from high-intensity laser

et al. 2016

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Abstract. The laser-matter interaction using nominal laser intensity above 10 15 W/cm 2 generates in vacuum non--equilibrium plasmas accelerating ions at energies from tens keV up to hundreds MeV. From thin targets, using the TNSA regime, plasma is generated in the forward direction accelerating ions above 1 MeV per charge state and inducing high-ionization states. Generally, the ion energies follow a Boltzmann-like distribution characterized by a cutoff at high energy and by a Coulomb-shift towards high energy increasing the ion charge state. The accelerated ions are emitted with the high directivity, depending on the ion charge state and ion mass, along the normal to the target surface. The ion fl uencies depend on the ablated mass by laser, indeed it is low for thin targets. Ions accelerated from plasma can be implanted on different substrates such as Si crystals, glassy-carbon and polymers at different fl uences. The ion dose increment of implanted substrates is obtainable with repetitive laser shots and with repetitive plasma emissions. Ion beam analytical methods (IBA), such as Rutherford backscattering spectroscopy (RBS), elastic recoil detection analysis (ERDA) and proton-induced X-ray emission (PIXE) can be employed to analyse the implanted species in the substrates. Such analyses represent 'off-line' methods to extrapolate and to character the plasma ion stream emission as well as to investigate the chemical and physical modifi cations of the implanted surface. The multi-energy and species ion implantation from plasma, at high fl uency, changes the physical and chemical properties of the implanted substrates, in fact, many parameters, such as morphology, hardness, optical and mechanical properties, wetting ability and nanostructure generation may be modifi ed through the thermal-assisted implantation by multi-energy ions from laser-generated plasma.

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Dependence of laser accelerated protons on laser energy following the interaction of defocused, intense laser pulses with ultra-thin targets

Cited by 28 publications

References 28 publications

Escaping Electrons from Intense Laser-Solid Interactions as a Function of Laser Spot Size

Escaping Electrons from Intense Laser-Solid Interactions as a Function of Laser Spot Size

Enhancement of ion generation in femtosecond ultraintense laser-foil interactions by defocusing

Multi-energy ion implantation from high-intensity laser

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