Abstract
A simple high-current low-emittance dc ECR proton source has been developed for a cw RFQ accelerator injector. Proton fractions of up to 90% have been obtained at beam current densities as high as 350 mA/cm 2. The normalized rms emittance of a 25 mA beam from a single 4.0 mm diameter extraction aperture was 0.07 π mm mrad corresponding to a brightness of 5 A/(π mm mrad) 2. Similar results were obtained with multiple aperture extraction systems.
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