What is it about?

Well focused negative ion beams are required for fusion plasma heating. Negative ion beams are usually observed with asymmetries in both real space and phase space. It has been thought that those asymmetric structures can affect beam divergences. This work has confirmed that a negative ion beam is made by multi-components having individual transverse velocity distributions.

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Why is it important?

The abundance ratio of multi-components has been quantified for the first time based on a full picture of their velocity distributions. The abundance ratio will be a key parameter to identify the origins of multi-components.

Perspectives

The origins of multi-components are expected to be closely related to production processes of negative ions, dipole field distribution of electron deflection magnets, and potential well during extraction. The present technique contributes to identify the origins of multi-components.

Yasuaki Haba
Nihon University

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This page is a summary of: Abundance ratio of multiple velocity distribution components in a single negative ion beamlet produced by a cesium-seeded negative ion source, AIP Advances, March 2022, American Institute of Physics, DOI: 10.1063/5.0083300.
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