Abstract: We report our recent progress in the CITIUS (Charge Integration Type Imaging Unit with high-Speed extended-dynamic-range) detector. It has been developed to overcome the count rate limitation of the current state-of-the-art photon counting detector by introducing novel integrating-type pixels with a size of 72.6 micrometers and a high frame rate of 17.4 kfps. Recently we succeeded in experimentally demonstrating its detecting capability of 945 Mcps/pixel (18 Tcps/cm2) at 10 keV while keeping its single photon sensitivity.
In this talk, we report our development status including the performance evaluation and the on-the-fly data processing with FPGAs. A feasibility study of Bragg CDI was carried out at ESRF last year. At SPring-8, applications of these detector systems to XPCS, ptychography, SAXS & WAXS, X-ray beam monitors by using spectro-imaging capability, and fluorescence yield XAFS by using large-area high-count-rate energy resolving detection are in progress. The status of these applications is also reported.
Table I Specifications of CITIUS variant for Synchrotron radiation experiments
Parameters |
Value |
|
Sensor |
Thickness |
650 µm |
Pixel Size |
72.6 µm |
|
Pixel Number |
0.28 Mpixel/sensor |
|
Noise |
0.027 phs. @ 8 keV (60 e-) |
|
Peak Signal |
1,800 phs. @ 12 keV |
|
Frame Rate |
17.4 kHz |
|
Sat. Count Rate @12 keV |
30 or 600 Mcps (*) |
|
Largest System |
Pixel Number |
20.2 Mpixel |
Image Area |
325 x 363 mm |
(*) 30 Mcps with standard operation. 600 Mcps in an extended mode