Drawings PAR AC Septum Magnet Complete Core Assembly Photos PAR septum magnet under construction Rob Wright and John Pace assembling a PAR septum magnet Sam Shanin, Jim Humbert, Tony Gorski, Sushil Sharma and Klaus Halbach Positron Accumulator Ring (PAR) AC Septum Magnet Operational Parameters* Number 1 Effective Length 0.4 m Field Strength 0.75 T Septum Thickness 2 mm Aperture 7.0 x 2.0 cm