High current ion beam formation with strongly inhomogeneous electrostatic field

TL;DR

This paper introduces a novel ion beam extraction method using strongly inhomogeneous electrostatic fields, significantly enhancing beam intensity and electrode lifespan without increasing voltage.

Contribution

The paper presents a new electrode geometry that improves ion beam formation efficiency and electrode durability in high-current ion sources.

Findings

Achieved ion beam current density over 1 A/cm².

Enhanced electrode lifespan in continuous wave operation.

Demonstrated effectiveness in electron cyclotron resonance sources.

Abstract

A new approach to the development of extraction systems capable of forming ion beams with previously inaccessible intensity is proposed. The use of inhomogeneous accelerating field allows to improve the ion beam formation efficiency significantly. The increase of electric field magnitude is achieved by changing the shape of the electrodes only, without increasing the accelerating voltage and decreasing the interelectrode distance. The comparison is made between a new extraction system and a flat traditional one, which is the most common. The use of a new electrode geometry allows to increase the lifetime of the electrodes in sources of intense beams operating in a continuous wave mode. For electron cyclotron resonance ion sources, results demonstrate the possibility to form high-quality ion beams with a current density of more than $1\:A/cm^2$.