A study of picosecond laser–solid interactions up to 1019 W cm−2

Beg, F. N.; Bell, A. R.; Dangor, A. E.; Danson, C.; Fews, AP; Glinsky, Michael E.; Hammel, B. A.; Lee, Paul; Norreys, P.; Tatarakis, M.

doi:10.1063/1.872103

Cited by 616 publications

(403 citation statements)

References 57 publications

(49 reference statements)

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“…Since the fast electron energy is dependent on I 0 k 2 0 , 31,32 it is possible using 3x radiation to obtain fast electrons with a range comparable to the size of the compressed target. The initial temperature and resistivity of the target are assumed to be 300 eV and 3 Â 10 À8 Xm.…”

Section: Theoretical Modelmentioning

confidence: 99%

Fast-electron self-collimation in a plasma density gradient

2012

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Reduction of the fast electron angular dispersion by means of varying-resistivity structured targets Phys. Plasmas 20, 013109 (2013) Nuclear stopping power in warm and hot dense matter Phys. Plasmas 20, 012705 (2013) Threshold conditions for lasing of a free electron laser oscillator with longitudinal electrostatic wiggler Phys. Plasmas 19, 123106 (2012) Halo formation and self-pinching of an electron beam undergoing the Weibel instability Phys. Plasmas 19, 103106 (2012) Additional information on Phys. Plasmas A theoretical and numerical study of fast electron transport in solid and compressed fast ignition relevant targets is presented. The principal aim of the study is to assess how localized increases in the target density (e.g., by engineering of the density profile) can enhance magnetic field generation and thus pinching of the fast electron beam through reducing the rate of temperature rise. The extent to which this might benefit fast ignition is discussed. V C 2012 American Institute of Physics. [http://dx

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Section: Theoretical Modelmentioning

confidence: 99%

Fast-electron self-collimation in a plasma density gradient

2012

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“…In experiments at laser intensities up to 5 ϫ 10 18 W / cm 2 , Beg et al 19 used a combination of PIN diodes and scintillators to determine the bremsstrahlung spectrum in five spectral windows ranging up to 250 keV and found that the emission spectrum could not be fitted by a single temperature. Multichannel bremsstrahlung dosimeters based on thermoluminescence detectors or imaging plate detectors have been employed in intense laser-matter interaction experiments to determine the hot electron spectrum and the absolute conversion of laser energy into hot electrons.…”

Section: A Hot Electron Spectramentioning

confidence: 99%

The role of hot electron refluxing in laser-generated K-alpha sources

Neumayer¹,

Aurand²,

Basko³

et al. 2010

Physics of Plasmas

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A study of the contribution of refluxing electrons in the production of K-alpha radiation from high-intensity laser irradiated thin targets has been performed. Thin copper foils both freestanding, and backed by a thick substrate were irradiated with laser pulses of energies around 100 J at intensities ranging from below 1017 to above 1019 W/cm2. At high laser intensities we find a strong reduction in the K-alpha yield from targets backed by the substrate. The observed yield reduction is in good agreement with a simple model using hot electron spectra from particle-in-cell simulations or directly inferred from the measured bremsstrahlung emission and can therefore be interpreted as due to the suppression of hot electron refluxing. The study shows that refluxing electrons play a dominant role in high-intensity laser driven K- alpha generation and have to be taken into account in designing targets for laser driven high-flux K-alpha sources.

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“…Also plotted are 3 estimations of the hot electron temperature from Beg, Haines and Wilks [12][13][14]. Figure 3 b) clearly shows that the escaping hot electron temperature is very similar as the laser is defocussed over 3 orders of magnitude of incident intensity.…”

Section: Fig 2 Polar Plots Of the Angularly-resolved Electron Variedmentioning

confidence: 87%

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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A study of picosecond laser–solid interactions up to 1019 W cm−2

Cited by 616 publications

References 57 publications

Fast-electron self-collimation in a plasma density gradient

Fast-electron self-collimation in a plasma density gradient

The role of hot electron refluxing in laser-generated K-alpha sources

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

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