Evaluation of a capillary plate gas detector filled with and gas mixtures

We report on the basic characteristics of a capillary plate (CP) gas detector filled with a Ne ( 90 % ) + CF 4 ( 10 % ) gas mixture. Both the charge and light signals were investigated. Gas gains of up to 10 4 can be achieved with the gas mixture. The energy resolutions of the charge and light signals were 17.0% and 24.2% for 6 keV X-rays, respectively, at a gas gain of 10 4 . These results were compared to those obtained with an Ar ( 90 % ) + CF 4 ( 10 % ) gas mixture. The emission spectrum of the gas scintillation light shows the presence of the atomic lines of Ne. There were also two broad continua attributed to CF 4 . We exploit the scintillation light for the realization of a pixelized two-dimensional imaging gas detector. Sharp images of X-rays and a spatial resolution of less than 135 μ m were obtained using an optical imaging system consisting of a standard photographic lens and a CCD camera.