A proton accelerator requires a wide range of beam properties such as beam energy, beam current, beam repetition rate, and beam pulse width. The electron beam ion source (EBIS), which can perform short pulse operation up to 1 μs, can meet the diverse requirements of users by facilitating enhanced utilization efficiency and broad application area. Therefore, the purpose of this study is to develop a superconducting solenoid magnet in order to focus electron beams, and to achieve a stable operation of EBIS system. A superconducting solenoid magnet plays a key role in the EBIS system for the production of short pulse beams. The electron beam extracted from the electron gun is accelerated till it reaches tens of keV. The electron beam is then focused by using a superconducting magnet. To increase the electron beam quality and utilization efficiency, a focusing radius below 1 mm is required. For achieving this criterion, the solenoid coil should be designed with the peak magnetic field of 7 T at the center. The solenoid coil needs highly uniform magnetic field along the axial and radial directions. Hence, a magnetic field analysis should be performed considering the characteristics of NbTi multifilament wire by using the finite element method. From the conceptual design result, the inner and outer diameters of the superconducting magnet are obtained as 280 mm and 324 mm, respectively. To satisfy the design requirements, the height of the coil is determined as 2000 mm. Furthermore, to prevent the mechanical deformation in the solenoid due to the Lorentz force distribution, the mechanical stress in coil is calculated by using the structural analysis. Detailed design parameters and numerical analysis results will be explained through the extended paper.
|Submitters Country||Republic of Korea|