Fast-electron transport in cylindrically laser-compressed matter

Experimental and theoretical results of relativistic electron transport in cylindrically compressed matter are presented. This experiment, which is a part of the HiPER roadmap, was achieved on the VULCAN laser facility (UK) using four long pulses beams (~4 × 50 J, 1 ns, at 0.53 µm) to compress a hollow plastic cylinder filled with plastic foam of three different densities (0.1, 0.3 and 1 g cm−3). 2D simulations predict a density of 2–5 g cm−3 and a plasma temperature up to 100 eV at maximum compression. A short pulse (10 ps, 160 J) beam generated fast electrons that propagate through the compressed matter by irradiating a nickel foil at an intensity of 5 × 1018 W cm−2. X-ray spectrometer and imagers were implemented in order to estimate the compressed plasma conditions and to infer the hot electron characteristics. Results are discussed and compared with simulations.

[1]  Jérôme Breil,et al.  A cell‐centred arbitrary Lagrangian–Eulerian (ALE) method , 2008 .

[2]  P. Norreys,et al.  Guiding of relativistic electron beams in solid targets by resistively controlled magnetic fields. , 2009, Physical review letters.

[3]  Rémi Abgrall,et al.  A Cell-Centered Lagrangian Scheme for Two-Dimensional Compressible Flow Problems , 2007, SIAM J. Sci. Comput..

[4]  C. W. Hirt,et al.  An Arbitrary Lagrangian-Eulerian Computing Method for All Flow Speeds , 1997 .

[5]  O. L. Landen,et al.  X-Ray Line Measurements with High Efficiency Bragg Crystals , 2004 .

[6]  R. Kodama,et al.  Fast heating of cylindrically imploded plasmas by petawatt laser light. , 2008, Physical review letters.

[7]  G. Zimmerman,et al.  A new quotidian equation of state (QEOS) for hot dense matter , 1988 .

[8]  Jérôme Breil,et al.  A second‐order cell‐centered Lagrangian scheme for two‐dimensional compressible flow problems , 2008 .

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

[10]  A. Ravasio,et al.  Density measurement of low- Z shocked material from monochromatic x-ray two-dimensional images. , 2008, Physical review. E, Statistical, nonlinear, and soft matter physics.

[11]  R. More,et al.  An electron conductivity model for dense plasmas , 1984 .

[12]  P. Norreys,et al.  Fast electron deposition in laser shock compressed plastic targets , 1998 .

[13]  M. Koenig,et al.  Novel diagnostic of low-Z shock compressed material , 2006 .