Stabilizing the ion beam transmission through tapered glass capillaries

TL;DR

This paper introduces a novel modification to tapered glass capillaries that stabilizes ion beam transmission by preventing Coulomb blocking, achieving up to 90% transmission efficiency through numerical analysis.

Contribution

The study proposes an original add-on to tapered capillaries, enhancing beam transmission stability and efficiency, which is experimentally testable and extends current understanding of ion beam guidance.

Findings

Add-on stabilizes transmission rate over a wider range of beam parameters

Achieves near 90% transmitted fraction of ion beams

Numerical results demonstrate improved control over Coulomb blocking

Abstract

When an ion beam is injected into a tapered insulating capillary, the induced self-organized radial Coulomb potential in the capillary is able to focus the beam like an electrostatic lens. However, because of the continued accumulation of charge in the capillary, an equilibrium is rarely attained and the injected beam is eventually "Coulomb" blocked by the capillary's potential. We propose an original add-on to the capillary setup, which can be tested experimentally and which is expected to hinder the Coulomb blocking. We investigate numerically the benefits and limits of the modified capillary setup. We show in how far the intensity and emittance of the injected beam control the transmission rate through conically tapered capillaries. Our results indicate that the add-on succeeds to stabilize the asymptotic transmission rate for a larger range of beam intensities and emittances, while reaching a near optimal transmitted fraction up to 90%