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Transport dynamics in a high-brightness magneto-optical-trap Li ion source

Published

Author(s)

Jamie Gardner, William R. McGehee, Mark D. Stiles, Jabez J. McClelland

Abstract

Laser-cooled gases offer an alternative to tip-based methods for generating high brightness ions for focused ion beam applications. These sources produce ions by photoionization of ultracold neutral atoms, where the narrow velocity distribution associated with microkelvin- level temperatures results in a very low emittance, high-brightness ion beam. In a magneto- optical-trap-based ion source, the brightness is ultimately limited by the transport of cold neutral atoms, which restricts the current that can be extracted from the ion-generating volume. We explore the dynamics of this transport in a 7Li magneto-optical trap ion source (MOTIS) by performing time-dependent measurements of the depletion and refilling of the ionization volume in a pulsed source. An analytic microscopic model for the transport is developed, and this model shows excellent agreement with the measured results.
Citation
Journal of Vacuum Science and Technology B
Volume
38
Issue
5

Keywords

MOTIS, cold atom ion source, MOT dynamics, magneto-optical trap, focused ion beam
Created September 14, 2020, Updated September 16, 2020