The first measurements of an ISR magnet

Whilst discussion at Frascati ranged over the whole field of high-energy accelerators and the work that is done with them, work in the New Accelerators group of CERN's Accelerator Research Division is concentrated on design and model work for the intersecting storage rings and the proposed 300-GeV synchrotron. This photograph shows measurements being carried out on the magnetic field of Model I of a magnet unit for the intersecting storage rings. The magnet is shorter than those used in the CERN proton synchrotron (2.5 m instead of 4 m). It also differs from the PS magnet by the fact that the punched laminations are held together by tension bars welded along the sides, instead of having the laminations glued together. The magnetic field is of about the same magnitude as that of the PS magnet, but covers a bigger volume ; the profile of the pole faces can be clearly seen in the photograph. The vertical frame attached to the magnet is the support for the measuring apparatus.