Detailed analysis of events from high-energy X-ray photons impinging on a two-phase front-illuminated CCD

Year: 2008

Authors: Levato T., Labate L., Galimberti M., Giulietti A., Giulietti D., Gizzi LA.

Autors Affiliation: CNR, ILIL IPCF, Area Ric Pisa, I-56124 Pisa, Italy;
Univ Pisa, Dipartimento Fis, I-56100 Pisa, Italy;
Univ Pisa, Ist Nazl Fis Nucl, Sez Pisa, I-56100 Pisa, Italy

Abstract: A study of the single-photon events generated by the interaction of X-rays up to 60 keV with a true two-phase charge coupled device (CCD) is reported. In particular, a relevant classification of the events is carried out according to their size and collected charge. This classification shows the occurrence of two main groups, characterized by a quite large difference in the ADU values that has been observed between events having different sizes but coming from photons with the same energy. Based upon 2D numerical calculations accounting for the charge cloud dynamics, diffusion and recombination, an explanation is suggested for this difference, arising from the difference in the electric field strength in the point of initial interaction. Moreover, the relative abundance of these two groups was found to be energy dependent. A model accounting for the true two-phase pixel structure was found to be a valid tool for a correct prediction of this abundance and an enhanced reconstruction of the spectra of the impinging photons. (C) 2008 Elsevier B.V. All rights reserved.


Volume: 592 (3)      Pages from: 346  to: 353

KeyWords: charge-coupled device; cloud shape; X-ray spectrometer; multi-pixel; single-pixel
DOI: 10.1016/j.nima.2008.04.011

Citations: 11
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