Photon beam position measurement system based on four-quadrant detector

In order to overcome the limitation that the two-wire monitor cannot measure the beam position in vertical and horizontal directions at the same time, a new photon beam position measurement system based on four-quadrant detector has been developed at the Hefei Light Source(HLS), and the logarithmic ratio method is used for data processing. After the calibration of the optical imaging system and the four-quadrant detector, main parameters of the photon beam position measurement system were obtained. In horizontal direction, the linear range is ±1.83 mm, and the sensitivity is 0.471 2 mm-1. In vertical direction, the linear range is ±1.32 mm, and the sensitivity is 0.635 0 mm-1. The system has a good performance price ratio.