Effect of the Plasma Density Scale Length on the Direction of Fast Electrons in Relativistic Laser-Solid Interactions

M. I. K. Santala; M. Zepf; I. Watts; F. N. Beg; E. Clark; M. Tatarakis; K. Krushelnick; A. E. Dangor; T. McCanny; I. Spencer; R. P. Singhal; K. W. D. Ledingham; S. C. Wilks; A. C. Machacek; J. S. Wark; R. Allott; R. J. Clarke; P. A. Norreys

doi:10.1103/PhysRevLett.84.1459

Effect of the Plasma Density Scale Length on the Direction of Fast Electrons in Relativistic Laser-Solid Interactions

M. I. K. Santala, M. Zepf, I. Watts, F. N. Beg, E. Clark, M. Tatarakis, K. Krushelnick, A. E. Dangor, T. McCanny, I. Spencer, R. P. Singhal, K. W. D. Ledingham, S. C. Wilks, A. C. Machacek, J. S. Wark, R. Allott, R. J. Clarke, and P. A. Norreys

Phys. Rev. Lett. 84, 1459 – Published 14 February 2000

Abstract

The angular distribution of bremsstrahlung $γ$ rays produced by fast electrons accelerated in relativistic laser-solid interaction has been studied by photoneutron activation in copper. We show that the $γ$ -ray beam moves from the target normal to the direction of the $k_{laser}$ vector as the scale length is increased. Similar behavior is found also in 2D particle-in-cell simulations.

Received 16 February 1999

DOI:https://doi.org/10.1103/PhysRevLett.84.1459

Authors & Affiliations

M. I. K. Santala^*, M. Zepf, I. Watts, F. N. Beg, E. Clark, M. Tatarakis, K. Krushelnick, and A. E. Dangor

Plasma Physics Group, The Blackett Laboratory, Imperial College, London SW7 2BZ, United Kingdom

T. McCanny, I. Spencer, R. P. Singhal, and K. W. D. Ledingham

Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom

S. C. Wilks

University of California, Lawrence Livermore National Laboratory, L-39, Livermore, California 94550

A. C. Machacek and J. S. Wark

Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom

R. Allott, R. J. Clarke, and P. A. Norreys

Central Laser Facility, Rutherford Appleton Laboratory, Chilton OX11 0QX, United Kingdom

^*Present address: Helsinki University of Technology, P.O. Box 2200, 02015 HUT, Finland.

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Vol. 84, Iss. 7 — 14 February 2000

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Physical Review Letters

Effect of the Plasma Density Scale Length on the Direction of Fast Electrons in Relativistic Laser-Solid Interactions

M. I. K. Santala, M. Zepf, I. Watts, F. N. Beg, E. Clark, M. Tatarakis, K. Krushelnick, A. E. Dangor, T. McCanny, I. Spencer, R. P. Singhal, K. W. D. Ledingham, S. C. Wilks, A. C. Machacek, J. S. Wark, R. Allott, R. J. Clarke, and P. A. Norreys

Phys. Rev. Lett. 84, 1459 – Published 14 February 2000

Abstract

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