Relativistically correct hole-boring and ion acceleration by circularly polarized laser pulses

Robinson, A. P. L.; Gibbon, Paul; Zepf, Matthew; Kar, S.; Evans, R. G.; Bellei, C.

doi:10.1088/0741-3335/51/2/024004

Cited by 234 publications

(308 citation statements)

References 20 publications

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“…3,15,16 and 19), and has been extended to the relativistic case in Ref. 11. Here we will just restate these results.…”

Section: Theorymentioning

confidence: 68%

“…Previous studies of hole-boring RPA have generally indicated that HB RPA should produce ions of modest energies (1-10 MeV) and that extremely high intensities (mid 10 22 W cm À2 ) are required to exceed 100 MeV. 11 Here we reexamine this problem and find that using HB RPA to reach proton energies of 100-200 MeV is possible for laser intensities of around 10 21 W cm À2 .…”

Section: Introductionmentioning

confidence: 78%

“…[1][2][3][4][5][6][7][8][9] Considerable effort has been put into both the theoretical and, more recently, the experimental aspects 10 of this problem. RPA has been classified into two modes: "hole-boring" 3,[11][12][13][14][15][16] (HB) and "light-sail" (LS). 1,2,6,17 Much attention has been focussed on the light sail mode of RPA because of the favourable scaling that this scheme exhibits.…”

Section: Introductionmentioning

confidence: 99%

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Production of high energy protons with hole-boring radiation pressure acceleration

Robinson¹

2011

Physics of Plasmas

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The possibility of producing energetic protons with energies in the range of 100–200 MeV via hole-boring (HB) radiation pressure acceleration (RPA) at intensities around 1021 W cm−2 is reexamined. It is found that hole-boring RPA can occur well below the relativistically corrected critical density in numerical simulations, with average proton energies in good agreement with established formulas. This suggests that protons in this energy range can be produced via HB RPA at around 1021 W cm−2. It is also shown that the prospects of doing this could be improved by using lasers of the same intensity but longer wavelength.

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“…3,15,16 and 19), and has been extended to the relativistic case in Ref. 11. Here we will just restate these results.…”

Section: Theorymentioning

confidence: 68%

Section: Introductionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

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Production of high energy protons with hole-boring radiation pressure acceleration

Robinson¹

2011

Physics of Plasmas

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“…The angular width of the gamma-ray spectrum generated by the skin-depth emission model as presented in Ridgers et al 3 predicts that the angular distribution is φ sim = cos −1 (v HB /c) where φ sim is the expected half angle, v HB is the hole boring velocity from Robinson et al 14 . The simulations in that paper provided angular widths that are broadly consistent with this prescription.…”

Section: B Angular Spread Of Gamma-ray Emissionmentioning

confidence: 99%

Synchrotron radiation, pair production, and longitudinal electron motion during 10-100 PW laser solid interactions

et al. 2014

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At laser intensities above 10 23 W/cm 2 the interaction of a laser with a plasma is qualitatively different to the interactions at lower intensities. In this intensity regime solid targets start to become relativistically underdense, gamma-ray production by synchrotron emission starts to become an important feature of the dynamics and, at even higher intensities, electron-positron pair production by the non-linear Breit-Wheeler process starts to occur. Previous work in this intensity regime has considered ion acceleration 1 , 2 , identified different mechanisms for the underlying plasma physics of laser generation of gamma-rays 3 , 4 , 5 considered the effect of target parameters on gamma-ray generation 6 and considered the creation of solid density positronium plasma 3 . However a complete linked understanding of the important new physics of this regime is still lacking. In this paper, an analysis is presented of the effects of target density, laser intensity, target preplasma properties and other parameters on the conversion efficiency, spectrum and angular distribution of gamma-rays by synchrotron emission. An analysis of the importance of Breit-Wheeler pair production is also presented. Target electron densities between 10 22 cm −3 and 5×10 24 cm −3 and laser intensities covering the range between 10 21 W/cm 2 (available with current generation laser facilities) and 10 24 W/cm 2 (upper intensity range expected from the ELI facility) are considered. It is found that peak efficiency of conversion of laser energy into gammaray energy is achieved when the target density is 0.1 times the relativistically corrected critical density and that higher efficiency is obtained at higher laser intensity. Target front surface preplasmas of sufficient length are found to increase the efficiency of gamma-ray production compared with striking overdense solid targets directly in a fashion comparable to that in Nakamura et al. 6 by ensuring that the laser pulse interacts with a plasma of the optimum density. However maximum laser conversion to gamma-rays is achieved by striking a uniform target of the optimum density or a preplasma of sufficient length that the preplasma is nearly a uniform slab. It is found that the efficiency of Breit-Wheeler pair production is not related to either relativistic transparency or efficiency of gamma-ray production but is maximized by striking a high density target with the most intense laser possible. A qualitative model for this behaviour is presented. An analysis of the behavior of the longitundal motion of electrons as target density and laser intensity change is presented and it is found that there are two distinct regimes separated by the ratio of the relativistically corrected plasma frequency to the laser frequency. It is found that the transition between the two regimes is related to the structure of the electron phase space at the head of the laser.

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“…First, if the foil is semiinfinite, ions experience a ''hole-boring'' (HB) phase of RPA [10,11]. At an early stage, the electron and ion density profiles and the electrostatic field E z before ions move are described by Fig.…”

mentioning

confidence: 99%

Radiation-Pressure Acceleration of Ion Beams from Nanofoil Targets: The Leaky Light-Sail Regime

et al. 2010

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Relativistically correct hole-boring and ion acceleration by circularly polarized laser pulses

Cited by 234 publications

References 20 publications

Production of high energy protons with hole-boring radiation pressure acceleration

Production of high energy protons with hole-boring radiation pressure acceleration

Synchrotron radiation, pair production, and longitudinal electron motion during 10-100 PW laser solid interactions

Radiation-Pressure Acceleration of Ion Beams from Nanofoil Targets: The Leaky Light-Sail Regime

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