Purpose In the standard design method of straight dipole magnets,the good field region is symmetric to the magnet mechanical center both in 2D and in 3D,so the obtained field quality is not the actual one because the ...Purpose In the standard design method of straight dipole magnets,the good field region is symmetric to the magnet mechanical center both in 2D and in 3D,so the obtained field quality is not the actual one because the field integration lines are not consistent with the curved beam paths.In this paper,an improved method for straight dipole magnets aiming at obtaining accurate field quality is proposed.Methods The field quality is calculated by taking into account the relationship of the good field region to the magnet straight geometry.General description of the improved method is introduced,and two application examples of straight dipole magnets are presented to investigate the detailed field quality difference between the improved and traditional methods.The result of the improved method is also compared with the field quality calculated along particle trajectory in OPERA-3D.Results It is shown that the difference in field quality between the improved and traditional methods cannot be neglected,and the field quality in the improved method is very close to the one calculated along real beam paths.Conclusion The field quality in the improved method is accurate enough for practical application in a straight dipole magnet.展开更多
文摘Purpose In the standard design method of straight dipole magnets,the good field region is symmetric to the magnet mechanical center both in 2D and in 3D,so the obtained field quality is not the actual one because the field integration lines are not consistent with the curved beam paths.In this paper,an improved method for straight dipole magnets aiming at obtaining accurate field quality is proposed.Methods The field quality is calculated by taking into account the relationship of the good field region to the magnet straight geometry.General description of the improved method is introduced,and two application examples of straight dipole magnets are presented to investigate the detailed field quality difference between the improved and traditional methods.The result of the improved method is also compared with the field quality calculated along particle trajectory in OPERA-3D.Results It is shown that the difference in field quality between the improved and traditional methods cannot be neglected,and the field quality in the improved method is very close to the one calculated along real beam paths.Conclusion The field quality in the improved method is accurate enough for practical application in a straight dipole magnet.
