Research on the effects of charge transfer efficiency on X-ray energy spectra taken with CCDs

Ruixi Liu; Jinqiang Wang; Long Dong

doi:10.1117/12.2550226

12 March 2020 Research on the effects of charge transfer efficiency on X-ray energy spectra taken with CCDs

Ruixi Liu, Jinqiang Wang, Long Dong

Proceedings Volume 11439, 2019 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems; 114391J (2020) https://doi.org/10.1117/12.2550226
Event: 2019 International Conference on Optical Instruments and Technology, 2019, Beijing, China

Abstract

The incident low-energy X-ray photon which interacts with CCD detector can produce photoelectric effect and generate photoelectrons^[1]. Under the ideal condition, the number of electrons is proportional to the energy of incident X-ray photon. Besides the electrons generated by X-ray absorbed in CCD is converted to readout voltage linearly . Therefore, the voltage is positively correlated with X-ray photon’s energy , and we can measure X-ray energy spectra directly. But in reality, because of the charge cloud diffusion, surface charge loss and charge transfer loss in the detection process based on CCD ， the spectral resolution （FWMH）is broadened. And in the mean time, the spectral peak becomes non-Gaussian with a shoulder and a flat shelf on the low energy side. In this paper , we develop the model and simulation of CCD’s spectral redistribution , including photoelectric conversion process, charge collection process, charge transfer process, and charge readout process. Among other things , we mainly analyze the influence of charge transfer efficiency on X-ray energy spectra.

Citation Download Citation

Ruixi Liu, Jinqiang Wang, and Long Dong "Research on the effects of charge transfer efficiency on X-ray energy spectra taken with CCDs", Proc. SPIE 11439, 2019 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems, 114391J (12 March 2020); https://doi.org/10.1117/12.2550226

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KEYWORDS

X-rays

Charge-coupled devices

Energy efficiency

X-ray detectors

Electrons

Diffusion

Mathematical modeling

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