Magnetic Field Measurement for Synchrotron Dipole Magnets of Heavy-Ion Therapy Facility in Lanzhou

Magnetic field measurement system is an indispensable part of Heavy-Ion Therapy Facility in Lanzhou (HITFiL). The Hall probe mapping system and long coil integral measure system are developed for dipole magnets measurement. The main parameters and the structure of the systems are described. Magnetic field calculations and the design of the synchrotron dipole magnets are also presented in brief. The main measurement results of magnetic field are shown in the article which includes excitation curve, transverse field homogeneity, effective length and integral field homogeneity. The test results prove that the measurement system is fully competent for the demand of HITFiL project, and ensure the smooth operations of subsequent measurement.