Title :
The effect of photo-neutrons on diagnostics using CR-39 for laser-accelerated ion beam
Author :
Kanasaki, M. ; Fukuda, Yukikatsu ; Sakaki, H. ; Yogo, A. ; Jinno, Satoshi ; Nishiuchi, M. ; Hattori, Asobu ; Matsukawa, K. ; Kondo, K. ; Oda, K. ; Yamauchi, Takashi
Author_Institution :
Grad. Sch. of Maritime Sci., Kobe Univ., Kobe, Japan
fDate :
June 30 2013-July 4 2013
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.
Keywords :
Monte Carlo methods; bremsstrahlung; ion accelerators; ion beams; laser beam effects; neutron flux; solid-state nuclear track detectors; CR-39 detector unit; Monte Carlo simulations; background noise; beam dump; bremsstrahlung processes; cluster-gas targets; laser-accelerated ion beam; laser-driven ion acceleration; photo-neutrons; Acceleration; Detectors; Laser beams; Laser theory; Neutrons; Protons;
Conference_Titel :
Lasers and Electro-Optics Pacific Rim (CLEO-PR), 2013 Conference on
Conference_Location :
Kyoto
DOI :
10.1109/CLEOPR.2013.6599974
