Monte Carlo simulation of x-ray generation and energy dissipation in a W/Cu target for optimum design of a high-power x-ray source

Abstract

Monte Carlo simulation of x-ray generation by electron impact was applied to a W/Cu target (tungsten W film on a copper substrate) to find the optimum conditions for a high-power x-ray source. To assess the performance of the high-power x-ray source, we propose using: The total intensity of continuous x-rays emitted from the target, , where i(λ) is a spectrum of continuous x-rays emitted from the target under bombardment of an electron beam of primary energy E0. The cooling efficiency of the W/Cu target, which is where and σj are the in-depth energy dissipation in a target of element j and the thermal conductivity of element j, respectively, in the W/Cu target with tungsten film thickness ΔW. Both I and γ were obtained from Monte Carlo calculations for different tungsten film thicknesses by varying the incidence angle of the electron beam and the take-off angle of the x-rays according to the primary energy levels of the electron beam. Copyright © 2002 John Wiley & Sons, Ltd.