Hi’Beam-A: A Pixelated Beam Monitor for the Accelerator of a Heavy-Ion Therapy Facility

In this article, a noninterceptive and high-accuracy beam position monitor, named Hi'Beam-A, has been designed for the accelerator of a heavy-ion therapy facility. The Hi'Beam-A consists of the detector subsystem and the readout subsystem. In the detector subsystem, the microchannel plate multiplies the ionized charge in the high vacuum chamber, and the novel Topmetal silicon pixel sensor directly collects the charge. The readout subsystem processes the data and calculates the beam position. Beam test results show that the Hi'Beam-A reaches an accuracy of 5 μm. This article will present the design, characterization, and beam test of Hi'Beam-A.