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Energetic Photon Spectra from Targets Irradiated by Picoseconds Lasers



Lawrence T. Hudson, John F. Seely, Csilla Szabo, Uri Feldman, Hui Chen, Albert Henins


Photon spectra in the energy range 60 keV to 1 MeV were recorded from targets irradiated by the LLNL Titan and LLE EP picosecond lasers. The radiation consisted of K shell radiation, Bremsstrahlung radiation from MeV electrons, and preliminary evidence for 511 keV positron annihilation radiation. The spectra were recorded by two instruments, an energy-dispersive CCD detector with a CsI phosphor coating that operated in the single hit per pixel mode and was absolutely calibrated using a Cs-137 662 keV source, and a wavelength-dispersive Cauchois type spectrometer employing a curved Ge(220) transmission crystal that operated in the first and second diffraction orders with high spectral resolution. The calibrated photon energy distributions from Au, Eu, and Al targets are compared to the energetic electron distributions emerging from the targets.
Journal of High Energy Physics


gamma ray, positron, picosecond laser


Hudson, L. , Seely, J. , Szabo, C. , Feldman, U. , Chen, H. and Henins, A. (2011), Energetic Photon Spectra from Targets Irradiated by Picoseconds Lasers, Journal of High Energy Physics (Accessed March 3, 2024)
Created April 30, 2011, Updated February 19, 2017