1:5 scale model of the split-field magnet used in the tunnel connecting PS to ISR

The fifth-scale model of the split field magnet which was being tested in Hall E1. One test concerned the measurement of the magnetic field by means of a probe, the arm of which may be seen protruding from the aperture. The main purpose of the model was to perfect the system of shielding the beam against the effect of the end fields. The beams enter at a wide angle and experience focusing forces, due to the end effects, which is countered by arranging magnetic screens around the beams.