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 [1]. 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 [2]. At SPring-8, applications of these detector systems to XPCS, ptychography [3], 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
References
- SPring-8 II Conceptual Design Report, RIKEN SPring-8 Center, 2014.
- Michael Grimes, J. Appl. Cryst. (2023). 56, 1032. (https://doi.org/10.1107/S1600576723004314)
- Y. Takahashi, et.al., J. Synchrotron Rad. in press. (https://doi.org/10.1107/S1600577523004897)
Background material: https://anl.box.com/s/satlx5xygsr32fidfpo5s022am3ghoul
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