Development of a Model 4 Tesla Diople Magnet

In order to respond to a need of reduction in size of a medical accelerator, a new idea has to be developed. A model permanent magnet exceeding 4 Tesla was recently designed, manufactured and measured. In the past, this field level was only achievable by a superconducting magnet or a pulsed high current coil magnet. In order to exceed a field level of an inherent property of a material of a dipole magnet, a new technique is invented. Although the size of a magnet gap is small in a model, reasonable size magnet can be constructed by a linear scaling. The high field DC magnet can be used in a cyclic accelerator either in cyclotron or in FFAG (Fixed Field Alternating Gradient) Accelerator.