Photoionization of a laser-cooled and compressed atomic beam from a high-flux thermal source can be used to create a high-brightness ion beam for use in focused-ion-beam instruments. Here we show using calculations and Doppler cooling simulations that an atomic rubidium beam with an equivalent brightness of 2.1 × 107 A/(m2 sr eV) can be created using a compact 5 cm long two-dimensional magneto-optical compressor. If this can be conserved during the photoionization process, this leads to an ion beam brightness an order of magnitude higher than produced by a liquid metal ion source. The source is also capable of producing a flux of 6.2 × 109 s-1 that results in a substantial beam current of 1 nA once fully ionized.
|Number of pages||8|
|Journal||Physical Review A : Atomic, Molecular and Optical Physics|
|Publication status||Published - 15 Dec 2014|
- Atomic and molecular beam sources and techniques
- Atom cooling methods
- Positive-ion beams
- Industrial and technological research and development