How to Acquire Highly Accurate Data at SPring-8-II: Quantifying the Relationship between Bunch-Modes and Photon-Counting Detectors（Press Release）
- Release Date
- 27 Feb, 2024
- Accelerator
27 February 2024
Japan Synchrotron Radiation Research Institute (JASRI)
RIKEN
Yasuhiko Imai, Senior Scientist of Diffraction and Scattering Division at Japan Synchrotron Radiation Research Institute, and Takaki Hatsui, Group Director of Control System and Data Infrastructure Group, Innovative Synchrotron Radiation Facility Division of RIKEN SPring-8 Center, evaluated the effective maximum count rate of photon-counting 2D detectors for various bunch-modes (timing type of synchrotron X-ray pulses) at SPring-8 through simulations. As a result, they were able to quantitatively clarify the maximum count rate of photon-counting 2D detectors for each bunch-mode. The upgrade of SPring-8 to SPring-8-II is currently under consideration. With the significant improvement in X-ray brightness expected upon upgrading to SPring-8-II, substantial progress in synchrotron radiation research is anticipated. However, the relationship between the maximum count rate and bunch-mode was not well understood. This study has now quantitatively elucidated the relationship between the maximum count rates and bunch-modes. Photon-counting 2D detectors play a crucial role in measuring high-energy X-rays in the photon energy range of 50-100 keV. This study provides fundamental insights for effectively utilizing such high-energy X-rays. By leveraging these findings, optimal detector operating conditions and bunch-modes at SPring-8-II can be determined, leading to advancements in research utilizing intense, high-energy X-rays. The results of this study were published in the scientific journal "Journal of Synchrotron Radiation" on February 16, 2024 (Friday) online and featured in the March issue, published on March 1, 2024 (Friday). 【Paper Information】 |
Fig. 1 Filling patterns of electrons in eight different bunch-modes at SPring-8
Fig. 2 Timing charts of synchrotron X-ray pulses in SPring-8 bunch-modes, A-mode (a) and B-mode (b), showing up to 137 nanoseconds.
Fig. 3 Response curves of a photon-counting detector obtained by simulation. The dead time is 120 nanoseconds. The detector response is assumed to follow the paralyzable model. (Multi) represents the complete multi-bunch mode (not currently operated at SPring-8).
Table 1 Effective maximum counting rates for SPring-8 bunch-modes calculated for three different dead times (120 nanoseconds (ns), 0.5 microseconds (μs), and 3 μs). (Multi) is the complete multi-bunch mode in which electrons are equally accumulated all around the storage ring (not currently operated at SPring-8).
Fig. 4 Graphical representation of Table 1, showing the effective maximum count rates for SPring-8 bunch modes, calculated for three different dead times (120 nanoseconds, 0.5 microseconds, and 3 microseconds). (Multi) is the complete multi-bunch mode in which electrons are equally accumulated all around the storage ring (not currently operated at SPring-8).
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