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Medical cyclotron used for proton therapy generally has a characteristic of compact,high magnetic field strength and not required high beam current.The internal ion source of PIG type for the cyclotron is selected and required to provide about tens keV/100μA the proton beam.According these requests,the
Medical cyclotron used for proton therapy generally has a characteristic of compact, high magnetic field strength and not required high beam current. Internal source source of PIG type for the cyclotron is selected and required to provide about tens keV / 100 μA of the proton beam. According these requests, the