Low-emittance monoenergetic electron and ion beams from ultra-intense laser-solid interactions [electronic resource].
- Washington, D.C. : United States. Dept. of Energy, 2000.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- PDF-FILE: 25 ; SIZE: 9 MBYTES pages
- Additional Creators:
- Lawrence Livermore National Laboratory
United States. Department of Energy
United States. Department of Energy. Office of Scientific and Technical Information
- Recent experiments at the LLNL Petawatt Laser have demonstrated the generation of intense, high energy beams of electrons and ions from the interaction of ultra-intense laser light with solid targets. Focused laser intensities as high as 6 x 10²° W/cm² are achieved, at which point the quiver energies of the target electrons extend to ≈10 MeV. In this new, fully relativistic regime of laser-plasma interactions, nuclear processes become important and nuclear techniques are required to diagnose the high-energy particle production. In recent experiments we have observed electrons accelerated to 100 MeV, up to 60 MeV brehmsstrahlung generation, photo-nuclear fission and positron-electron pair creation. We also have observed monoenergetic jets of electrons having sufficiently small emittance to be interesting as a laser-accelerated beam, if the production mechanism could be understood and controlled. The huge flux of multi-MeV ponderomotively accelerated electrons produced in the laser-solid interaction is also observed to accelerate contaminant ions from the rear surface of the solid target up to 50 MeV. We describe spectroscopic measurements which reveal intense monoenergetic beam features in the proton energy spectrum. The total spectrum contains >10¹³ protons, while the monoenergetic beam pulses contain ≈1 nC of protons, and exhibits a longitudinal and transverse emittance smaller than conventional RF proton accelerator beams.
- Published through SciTech Connect.
2nd ICFA Beam Dynamics Workshop on the Physics of High Brightness Beams, Los Angeles, CA (US), 11/09/1999--11/11/1999.
Johnson, J; Allen, M M; Roth, M; Hatchett, S P; Cowan, T E; Wilks, S C; Le Sage, G P.
- Funding Information:
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