CITIUS in Spectro-Imaging Mode: Achieving 220 eV FWHM at 6 keV with Room Temperature Operation

CITIUS is a high-frame-rate, integrating-type X-ray imaging detector, demonstrating its capabilities in coherent applications such as XPCS, Bragg CDI, and ptychography [1-3]. Its high frame rate of 17.4 kframes/s has also proven advantageous in quasi-elastic scattering studies [4].

Since July 2024, the deployment of an XFEL mode with a 20.2 Mpixel system has commenced. Recently, CITIUS has showcased its spectroscopy capabilities. The photon energy resolution is influenced by the frame rate and the analysis algorithm. At a frame rate of 26.1 kframes/s with full-frame readout, it achieves 600-700 eV FWHM at room temperature operation, which has been utilized in laboratory-based spectral decomposed CT [5]. The resolution has been further improved to 220 eV FWHM at 6 keV at a frame rate of 2.2 kframes/s.

In this talk, with a summary of the CITIUS current status, we will describe the architecture of CITIUS’s spectro-imaging mode in some details.

[1] M. Grimes et.al., J. Appl. Cryst. 56(4) (2023) 1032.
[2] Y. Takahashi et.al., J. Synchrotron Rad. Vol. 30(5) (2023) 989.
[3] J. Deng, A. Miceli, and C. Jacobsen. /J. of Synchr. Rad./ 30(5) (2023) 859.
[4] M. Saito et.al., Phys. Rev. Lett.*132* (2024) 256901.
[5] V. Di Trapani et.al., presentation at iWorid 2024.