Computer Simulation of the Three-Dimensional Regime of Proton Acceleration in the Interaction of Laser Radiation with a Thin Spherical Target

Results from particle-in-cell simulations of the three-dimensional regime of proton acceleration in the interaction of laser radiation with a thin spherical target are presented. It is shown that the density of accelerated protons can be several times higher than that in conventional accelerators. The focusing of fast protons created in the interaction of laser radiation with a spherical target is demonstrated. The focal spot of fast protons is localized near the center of the sphere. The conversion efficiency of laser energy into fast ion energy attains 5%. The acceleration mechanism is analyzed and the electron and proton energy spectra are obtained.

[1]  Stefano Atzeni,et al.  Inertial fusion fast ignitor: Igniting pulse parameter window vs the penetration depth of the heating particles and the density of the precompressed fuel , 1999 .

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

[3]  Francesco Pegoraro,et al.  Nonlinear electrodynamics of the interaction of ultra-intense laser pulses with a thin foil , 1998 .

[4]  Tabak,et al.  Absorption of ultra-intense laser pulses. , 1992, Physical review letters.

[5]  T. E. Cowan,et al.  Nuclear fusion from explosions of femtosecond laser-heated deuterium clusters , 1999, Nature.

[6]  A. V. Kuznetsov,et al.  Efficiency of ion acceleration by a relativistically strong laser pulse in an underdense plasma , 2001 .

[7]  A. Piriz,et al.  Optimum particle range for triggering fast ignition , 1998 .

[8]  S. V. Bulanov,et al.  Relativistic Interaction of Laser Pulses with Plasmas , 2001 .

[9]  E. W. Herold,et al.  Controlled fusion , 1959, IRE Transactions on Electron Devices.

[10]  Michael D. Perry,et al.  Ignition and high gain with ultrapowerful lasers , 1994 .

[11]  D. Neely,et al.  MULTI-MEV ION PRODUCTION FROM HIGH-INTENSITY LASER INTERACTIONS WITH UNDERDENSE PLASMAS , 1999 .

[12]  T. C. Sangster,et al.  Hot electron production and heating by hot electrons in fast ignitor research , 1998 .

[13]  Tetsuya Honda,et al.  高密度プラズマ中の直線偏光超高強度レーザーの非等方フィラメンテーション;高密度プラズマ中の直線偏光超高強度レーザーの非等方フィラメンテーション;Anisotropic Filamentation of Linearly Polarized Ultra Intense Laser in Overdense Plasmas , 1999 .

[14]  Denavit.  Absorption of high-intensity subpicosecond lasers on solid density targets. , 1992, Physical review letters.

[15]  T. Tajima,et al.  Laser Electron Accelerator , 1979 .

[16]  Takayoshi Norimatsu,et al.  Experimental studies of the advanced fast ignitor scheme , 2000 .

[17]  Proton beams in radiotherapy , 1998 .

[18]  M. Murakami,et al.  The Interaction Physics of the Fast Ignitor Concept , 1996, Physical review letters.

[19]  Timur Zh. Esirkepov,et al.  Ion acceleration regimes in underdense plasmas , 2000 .