J. Phys. IV France
Volume 133, June 2006
Page(s) 473 - 477
Publié en ligne 16 juin 2006
Inertial Fusion Sciences and Applications 2005
J.-C. Gauthier, et al.
J. Phys. IV France 133 (2006) 473-477

DOI: 10.1051/jp4:2006133097

Development of a collimated keV X-ray beam for probing of dense plasmas

R. Shah1, K. Taphuoc1, F. Albert1, A. Rousse1, F. Burgy1, B. Mercier1, J.-P. Rousseau1, A. Pukhov2 and S. Kiselev2

1  Laboratoire d'Optique Appliquée, ENSTA, CNRS UMR 7639, École Polytechnique, Chemin de la Hunière, 91761 Palaiseau, France
2  Institut fur Theoretische Physik I, Heinrich-Heine-Universitat, Duesseldorf, 40225 Dusseldorf, Germany

Experimental findings of a fully optical, keV x-ray source of 1-2$^{\circ}$ divergence and broadband spectrum (>5 keV bandwidth) are presented. The radiation results from the highly relativistic interaction of a 30 TW(1 J, 30 fs) laser pulse thru a 3 mm length span of He gas ( $n_{e}=1\times 10^{19}$ electrons/cm3). Quantitative measurements from the filtered back-illuminated CCD give 105 photons/eV, and the knife-edge technique measures the source diameter of 10 $\mu$m. These source characteristics, the measured beam of relativistic electrons, and PIC simulation indicate the radiation results from forceful transverse oscillations of the laser-accelerated electrons in response to the ionic channel formed by the laser pulse. The source brightness (107 photons/eV/mm2/mr2/shot and ultrafast duration ($\leq$30 fs) make it applicable to both backlighting and x-ray science applications.

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