Abstract
In laser-driven ion acceleration experiments applying cluster-gas targets, a significant amount of high energy electrons are produced. Such fast electrons can produce photo-neutrons via bremsstrahlung processes followed by (γ,n) reactions. When the CR-39 is exposed to photo-neutrons, it records etchable tracks of generated ions depending on their species and energy as background noises. To minimize the effect of photo-neutrons, the configuration of the CR-39 detector unit and beam dump for high energy electrons has been examined by Monte Carlo simulations. As a result, we have found the suitable configuration for CR-39 to detect only laser-accelerated ions with less contaminant by photo-neutrons in one laser shot.
© 2013 IEICE
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