Radiation induced noise in x-ray imagers for high-yield inertial confinement fusion experiments
2011
The large fluence of 14-MeV neutrons produced in high-yield inertial confinement fusion (ICF) experiments creates a
variety of backgrounds in x-ray imagers viewing the implosion. Secondary charged particles produce background light
by Cherenkov emission, phosphor screen excitation and possibly scintillation in the optical components of the imager. In
addition, radiation induced optical absorption may lead to attenuation of the signal. Noise is also produced directly in the
image recorder itself (CCD or film) via energy deposition by electrons and heavy charged particles such as protons and
alphas. We will present results from CCD background measurements and compare them to Monte Carlo calculations. In
addition we show measurements of luminescence and long-term darkening for some of the glasses employed in imagers.
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