The control of 'training' in 'racetrack' shaped superconducting magnets

This paper describes a series of experiments on small straight-sided ('racetrack') magnets designed to investigate the influence of the force support structure on training. In windings typical of those used in large magnets we have demonstrated that training can be eliminated by correct clamping of the windings and that it can be re-introduced by poor clamping. This behaviour has been found for several quite different types of winding impregnation and has also been confirmed at temperatures down to 2.3 K.