Abstract
Particle tracking systems, which function either as particle detectors or beam monitors, are the critical elements for the high-intensity heavy-ion accelerator facility (HIAF) complex. The novel Topmetal-M pixel sensor, which combines the features of both monolithic active pixel sensor (MAPS) and the Topmetal sensor, can be used either for a pixel detector or a nondestructive beam monitor. The Topmetal got its name as some part of the pixel’s top metal layer is exposed to sense the drifting charge. In this article, a prototype particle tracking system, named Hi’Beam-S, has been designed to characterize the Topmetal-M sensor. The laser test shows a spatial resolution of <inline-formula> <tex-math notation="LaTeX">$\sim 9 ~\mu \text{m}$ </tex-math></inline-formula> for the laser spot measurement. The heavy-ion beam test demonstrates that, for a 5-mm track with a ~20° incident angle, a spatial resolution of <inline-formula> <tex-math notation="LaTeX">$\sim 1.59 ~\mu \text{m}$ </tex-math></inline-formula> could be achieved.
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