A Princeton Instruments PI-LCX 1300 charge-coupled device(CCD) camera used for X-ray spectrum measurements in laser-plasma experiments is calibrated using three radioactive sources and investigated with the Monte Carlo code Geant4. The exposure level is controlled to make the CCD work in single photon counting mode. A summation algorithm for obtaining accurate X-ray spectra is developed to reconstruct the X-ray spectra, and the results show that the developed algorithm efectively reduces the low-energy tail caused by split pixel events. The obtained CCD energy response shows good linearity. The detection eficiency curves from both Monte Carlo simulations and the manufacturer agree well with the experimental results. This consistency demonstrates that event losses in charge collection processes are negligible when the developed summation algorithm of split pixel events is employed.
In inertial confinement fusion(ICF),X-ray coded imaging is considered as the most potential means to diagnose the compressed core.The traditional Richardson–Lucy(RL) method has a strong ability to deblur the image where the noise follows the Poisson distribution.However,it always suffers from over-fitting and noise amplification,especially when the signal-to-noise ratio of image is relatively low.In this paper,we propose an improved deconvolution method for X-ray coded imaging.We model the image data as a set of independent Gaussian distributions and derive the iterative solution with a maximum-likelihood scheme.The experimental results on X-ray coded imaging data demonstrate that this method is superior to the RL method in terms of anti-overfitting and noise suppression.
