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When an ion beam is injected into a tapered insulating capillary, the inducedself-organized radial Coulomb potential in the capillary is able to focus thebeam like an electrostatic lens. However, because of the continued accumulationof charge in the capillary, an equilibrium is rarely attained and the injectedbeam is eventually "Coulomb" blocked by the capillary's potential. We proposean original add-on to the capillary setup, which can be tested experimentallyand which is expected to hinder the Coulomb blocking. We investigatenumerically the benefits and limits of the modified capillary setup. We show inhow far the intensity and emittance of the injected beam control thetransmission rate through conically tapered capillaries. Our results indicatethat the add-on succeeds to stabilize the asymptotic transmission rate for alarger range of beam intensities and emittances, while reaching a near optimaltransmitted fraction up to 90%

Stabilizing the ion beam transmission through tapered glass capillaries