Quadrupole for the SIS 300

Main parameters for the SIS300 quadrupole, GSI, Darmstadt, project FAIR, are 45 T/m central gradient in 105-mm aperture, the effective length of the quadrupole is 1 m. Optimized geometric parameters of 1-layer magnet are presented both in the cross section and end parts. The coil consists of 3 blocks in one quadrant. Collars are a self-supporting mechanical structure. Integral multipoles are suppressed by central harmonics. Thermal and mechanical characteristics of the magnet are also presented.