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Description
Heavy ion or proton beams have the so called “Bragg peak” which enables a high dose administration to the tumor with greatly limiting the dose to the surrounding healthy tissues, besides of having a higher cell killing effect than photon beams. A safe and efficient treatment, high accuracy image guidance and good imaging techniques to distinguish a tumor from healthy tissues are required and crucial. MRI-guided proton therapy is the best option for this purpose. In order to minimize the effect of the magnetic field on the proton beam an open gradient MRI magnet is needed. This paper presents an electro-magnetic, mechanical and thermal FEM modeling of a 2 T actively shielded MgB2 open gradient MRI magnet for proton therapy applications. The magnet is cryocooler cooled with 10 ppm homogeneity in DSV (Diameter of Spherical Volume) of 0.5 m. A new class of MgB2 strand especially designed for MRI applications was considered for the winding the magnet. The magnet can get 2 T field and it can be operated up to 15 K.
