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Silicon avalanche photodiode linear-array detector with multichannel scaling system for pulsed synchrotron X-ray experiments

Kishimoto, Shunji*; Mitsui, Takaya; Haruki, Rie*; Yoda, Yoshitaka*; Taniguchi, Takashi*; Shimazaki, Shoichi*; Ikeno, Masahiro*; Saito, Masatoshi*; Tanaka, Manobu*

We developed an X-ray detector system using a 64-pixel silicon avalanche photodiode Si-APD linear array and fast pulse-counting electronics for multichannel scaling. The Si-APD linear array consists of 64 pixels each 0.01$$times$$0.02 cm$$^{2}$$ in size, with a pixel pitch of 0.015 cm and depletion depth of 0.001 cm. The fast electronics, consisting of an ultrafast application-specific integrated circuit and field-programmable gate arrays, can record both the position and timing of X-rays arriving at each pixel of the linear array with 1 ns pulse-pair resolution. The count distribution was measured using 14.4 keV synchrotron X-rays for nuclear resonant forward scattering experiments on $$^{57}$$Fe, and the spatial resolution was improved by inclining the detector. We also successfully measured amorphous alloy Fe$$_{78}$$Si$$_{9}$$B$$_{13}$$ during heating.

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