Wide aperture multipole magnets of the kinematic separator COMBAS. Analyzing multipole magnets M1 and M8 with compensation for higher order aberrations

The high-resolving large aperture kinematic separator COMBAS has been created and commissioned. The magneto-optical structure of separator is based on the strong focusing principle. The separator consists of eight wide aperture multipole magnets M1-M8. The first and the last magnets, M1 and M8, contain power quadrupole and octupole components in their field distributions. The presence of these components allowed one to intensify focusing without quadrupoles, minimize spherical aberrations and compensate for chromatic effects. Three-component magnetic measurements of the multipole magnets M1 and M8 have been performed, These measurements let both compile 3D-maps of the magnetic fields and analyze the magnet manufacturing quality. The 3D-maps of the magnetic field are supposed to be used for the particle trajectory simulations along the separator