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Description
Ion therapy has attracted increasing attention because of its favorable dose distribution enabled by its Bragg-peak behavior. Motivated by the ion therapy facility project at Shanghai Synchrotron Radiation Facility (SSRF), a novel 2.45 GHz ECR ion source has been proposed in this paper. An RF rotator is employed for the first time in the field of ion sources to couple the microwave power into the plasma chamber and excite an intrinsically rotating electric field. The rotating direction of the electric field is designed to be consistent with the electron cyclotron motion in the magnetic field, which is expected to enhance the resonant absorption, boost the electron energy and consequently improve the production of low-to-medium charge-state ions.
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