The role of hot electron refluxing in laser-generated K-alpha sources
- ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum fuer Schwerionenforschung, Planckstrasse 1, 64291 Darmstadt (Germany)
- Institute for Theoretical and Experimental Physics, 117218 Moscow (Russian Federation)
- Helmholtzzentrum fuer Schwerionenforschung GSI, 64291 Darmstadt (Germany)
- ExtreMe Matter Inst. EMMI, GSI Helmholtzzentrum fuer Schwerionenforschung, Planckstrasse 1, 64291 Darmstadt (Germany)
- RRC Kurchatov Inst., 123182 Moscow (Russian Federation)
- LULI, Ecole Polytechnique, 91128 Palaiseau Cedex (France)
A study of the contribution of refluxing electrons in the production of K-alpha radiation from high-intensity laser irradiated thin targets has been performed. Thin copper foils both freestanding, and backed by a thick substrate were irradiated with laser pulses of energies around 100 J at intensities ranging from below 10{sup 17} to above 10{sup 19} W/cm{sup 2}. At high laser intensities we find a strong reduction in the K-alpha yield from targets backed by the substrate. The observed yield reduction is in good agreement with a simple model using hot electron spectra from particle-in-cell simulations or directly inferred from the measured bremsstrahlung emission and can therefore be interpreted as due to the suppression of hot electron refluxing. The study shows that refluxing electrons play a dominant role in high-intensity laser driven K- alpha generation and have to be taken into account in designing targets for laser driven high-flux K-alpha sources.
- OSTI ID:
- 21421282
- Journal Information:
- Physics of Plasmas, Vol. 17, Issue 10; Other Information: DOI: 10.1063/1.3486520; (c) 2010 American Institute of Physics; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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