Design of Sextupole Magnet for 200 GeV Line

Sextupole magnets of 4 inch aperture, 2 kG/in2 strength have been designed for use in the NAL Meson Area beam line. Pole shapes have been determined by conformal mapping to give continuous contours which are approximated by short straight line segments to facilitate machining. The resulting field quality is within .17 percent of a pure sextupole over a 3 inch "Good Field Width". The excitation is provided by a monolithic coil on each pole wound from .230 inch solid square copper. Four water-cooled flattened tubes provide heat sinks for conduction cooling with a maximum temperature rise of 20° C in the winding. Magnetic field measurements are presented.