The core tube of the scanning magnet is one of the key components for the beam extraction in high power electron accelerators. The paper describes the material selection

structure design

and machining process of the core tube. The shape and position of ribs on the core tube are optimized by using FEA software

and the welding technology for the core tube is specified

which ensure that the core tube can run in good condition when the high power electron accelerator is used for desulfation of flue gas.