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We report on a successful test of a new method for intense ion beam formationusing an extraction with inhomogeneous electric field. Its key feature is aspecial shape of the extraction electrodes providing a higher rate of ionacceleration. It is applicable to any ion source type and could be used toimprove performance of a wide range of plasma devices. The proof of concept wascarried out using a high-current electron-cyclotron resonance ion source SMIS37. High efficiency of the new extraction and proton beam formation with arecord current density of up to 1.1 A cm-2 was demonstrated.

Experiments on intense ion beam formation with inhomogeneous electric field