Control of energy spread and dark current in proton and ion beams generated in high-contrast laser solid interactions.

By using temporal pulse shaping of high-contrast, short pulse laser interactions with solid density targets at intensities of 2 × 10(21) W cm(-2) at a 45° incident angle, we show that it is possible to reproducibly generate quasimonoenergetic proton and ion energy spectra. The presence of a short pulse prepulse 33 ps prior to the main pulse produced proton spectra with an energy spread between 25% and 60% (ΔE/E) with energy of several MeV, with light ions becoming quasimonoenergetic for 50 nm targets. When the prepulse was removed, the energy spectra was broad. Numerical simulations suggest that expansion of the rear-side contaminant layer allowed for density conditions that prevented the protons from being screened from the sheath field, thus providing a low energy cutoff in the observed spectra normal to the target surface.

[1]  T. Mehlhorn,et al.  Generation of laser-driven light ions suitable for fast ignition of fusion targets , 2011 .

[2]  G I Dudnikova,et al.  Monoenergetic proton beams accelerated by a radiation pressure driven shock. , 2010, Physical review letters.

[3]  Michael Bussmann,et al.  The scaling of proton energies in ultrashort pulse laser plasma acceleration , 2010 .

[4]  D Kiefer,et al.  Radiation-pressure acceleration of ion beams driven by circularly polarized laser pulses. , 2009, Physical review letters.

[5]  Andrea Macchi,et al.  "Light sail" acceleration reexamined. , 2009, Physical review letters.

[6]  Christopher Ridgers,et al.  Rapid self-magnetization of laser speckles in plasmas by nonlinear anisotropic instability , 2009 .

[7]  D W Litzenberg,et al.  Accelerating monoenergetic protons from ultrathin foils by flat-top laser pulses in the directed-Coulomb-explosion regime. , 2008, Physical review. E, Statistical, nonlinear, and soft matter physics.

[8]  D. Neely,et al.  High contrast plasma mirror: spatial filtering and second harmonic generation at 1019 W cm−2 , 2008 .

[9]  R. G. Evans,et al.  Radiation pressure acceleration of thin foils with circularly polarized laser pulses , 2007, 0708.2040.

[10]  Paul McKenna,et al.  Spectral control in proton acceleration with multiple laser pulses , 2007 .

[11]  Vladimir Chvykov,et al.  Generation of 10 11 contrast 50 TW laser pulses , 2006 .

[12]  Patrick Audebert,et al.  Ultrafast Laser-Driven Microlens to Focus and Energy-Select Mega-Electron Volt Protons , 2006, Science.

[13]  A. Bell,et al.  Effect of target composition on proton energy spectra in ultraintense laser-solid interactions. , 2006, Physical review letters.

[14]  K. Flippo,et al.  Laser acceleration of quasi-monoenergetic MeV ion beams , 2006, Nature.

[15]  K.-U. Amthor,et al.  Laser-plasma acceleration of quasi-monoenergetic protons from microstructured targets , 2006, Nature.

[16]  J. Meyer-ter-Vehn,et al.  Influence of the laser prepulse on proton acceleration in thin-foil experiments. , 2004, Physical review letters.

[17]  Erik Lefebvre,et al.  Practicability of protontherapy using compact laser systems. , 2004, Medical physics.

[18]  M Borghesi,et al.  Highly efficient relativistic-ion generation in the laser-piston regime. , 2004, Physical review letters.

[19]  S. Wilks,et al.  Direct experimental evidence of back-surface ion acceleration from laser-irradiated gold foils. , 2004, Physical review letters.

[20]  Matthew Zepf,et al.  The plasma mirror—A subpicosecond optical switch for ultrahigh power lasers , 2004 .

[21]  A. R. Bell,et al.  An implicit Vlasov-Fokker-Planck code to model non-local electron transport in 2-D with magnetic fields , 2004 .

[22]  Ph. A. Martin,et al.  Complete characterization of a plasma mirror for the production of high-contrast ultraintense laser pulses. , 2004, Physical review. E, Statistical, nonlinear, and soft matter physics.

[23]  V. Tikhonchuk,et al.  Charge separation effects in solid targets and ion acceleration with a two-temperature electron distribution. , 2004, Physical review. E, Statistical, nonlinear, and soft matter physics.

[24]  P. Mora,et al.  Plasma expansion into a vacuum. , 2003, Physical review letters.

[25]  D. H. Campbell,et al.  Proton imaging detection of transient electromagnetic fields in laser-plasma interactions (invited) , 2003 .

[26]  B Shahine,et al.  Particle in cell simulation of laser-accelerated proton beams for radiation therapy. , 2002, Medical physics.

[27]  A. V. Kuznetsov,et al.  Oncological hadrontherapy with laser ion accelerators , 2002 .

[28]  Wei Lu,et al.  OSIRIS: A Three-Dimensional, Fully Relativistic Particle in Cell Code for Modeling Plasma Based Accelerators , 2002, International Conference on Computational Science.

[29]  C. Capjack,et al.  Fast ignitor concept with light ions , 2001 .

[30]  M. D. Perry,et al.  Fast ignition by intense laser-accelerated proton beams. , 2001, Physical review letters.

[31]  T. C. Sangster,et al.  Intense high-energy proton beams from Petawatt-laser irradiation of solids. , 2000, Physical review letters.

[32]  Gu,et al.  Forward ion acceleration in thin films driven by a high-intensity laser , 2000, Physical review letters.

[33]  Michael D. Perry,et al.  Electron, photon, and ion beams from the relativistic interaction of Petawatt laser pulses with solid targets , 2000 .

[34]  Deanna M. Pennington,et al.  Energetic proton generation in ultra-intense laser–solid interactions , 2000 .

[35]  Hutchinson,et al.  Supersonic Ionization Wave Driven by Radiation Transport in a Short-Pulse Laser-Produced Plasma. , 1996, Physical review letters.

[36]  Paul Gibbon,et al.  Short-pulse laser - plasma interactions , 1996 .

[37]  D A Gregory,et al.  Self-organization of scattering in photorefractive KNbO(3) into a reconfigurable hexagonal spot array. , 1995, Optics letters.

[38]  Brunel.  Not-so-resonant, resonant absorption. , 1987, Physical review letters.

[39]  S. J. Thomson,et al.  XXVI. Rays of positive electricity , 1907 .