title: Magnetic field calculation for a 10 MeV positron emission tomography cyclotron.
abstract: The magnetic field calculation and correction for a 10 MeV positron emission tomography cyclotron is presented. 3D TOSCA analysis results are compared with the measured data, and the calculation error is used to calibrate the B-H curve to obtain a very precise finite element method estimator, which is used to predict the correction of the magnet pole for achieving the isochronous field. The isochronous field error is approximated with the effects of a set of standard patches. On the assumption that the effect of each small patch is proportional to its surface, the correction of the magnet pole is found by solving a system of equations using the least square scheme. The magnet shimming is performed and the measured magnetic field is found in good agreement with the prediction, with an error less than 2 G.
authors.affiliation: State Key Lab of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China. dzhchen@mail.hust.edu.cn
authors.forename: Dezhi
authors.initials: D
authors.lastname: Chen
authors.forename: Zihao
authors.initials: Z
authors.lastname: Chen
authors.forename: Kaifeng
authors.initials: K
authors.lastname: Liu
authors.forename: Jun
authors.initials: J
authors.lastname: Yang
authors.forename: Dong
authors.initials: D
authors.lastname: Li
authors.forename: Bin
authors.initials: B
authors.lastname: Qin
authors.forename: Yongqian
authors.initials: Y
authors.lastname: Xiong