Abstract
X-Ray sources, detectors and optical components are now used in a wide range of applications. What is crucial is the absolute calibration of such devices to permit a quantitative assessment of the system under study. A new X-ray laboratory has been built in Frascati (ENEA) to develop diagnostics for nuclear fusion experiments and study applications of these X-ray techniques in other domains, like new material science, non destructive tests and so on. An in-house developed selfconsistent calibration procedure is described that permits the absolute calibration of sources (X-ray emitted fluxes) and detectors (detection efficiencies) as function of the X-ray photon energy, in the range 2 - 120 keV. The calibration procedure involves the use of an in-house developed code that also predicts the spectral response of any detector in any experimental condition that can be setup in the laboratory. The procedure has been then applied for the calibration and characterisation of gas and solid state imaging detectors, such as Medipix-2, GEM gas detector, CCD camera, Cd-Te C-MOS imager, demonstrating the versatility of the method developed here.
Highlights
Magnetic Fusion Plasmas are extended sources of Soft and Hard X-rays and the detectors or optics are usually located at large distances from the plasma
The detection efficiency of X-ray imaging detectors, such as Medipix-2, GEM gas detector and CCD camera, were included in Pred-X to simulate the spectrum detected by these detectors
Detection efficiency of the Medipix-2 was estimated in the range 3 - 30 keV by utilizing the absolutely calibrated X-ray sources [6]
Summary
Magnetic Fusion Plasmas are extended sources of Soft and Hard X-rays and the detectors or optics are usually located at large distances from the plasma. A problem is that the detection efficiency curves are not usually provided by the manufacturer To overcome these problems and provide a versatile, but calibrated experimental set of tools for X-Ray applications (detection and imaging), we propose the use of a combination of detectors (Si-PIN, SDD, CdTe) with a suitable set of filters and pinholes. With this aim in mind, a self-consistent iterative procedure was developed in house to calibrate sources and detectors, and to predict operational characteristics of sources/detectors in any experimental conditions of interest. The results presented have been obtained using the code to permit a quantitative calibration of sources and detectors
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