Guiding Fast Ion Beam by Suppressing Secondary Ions
- 9 March 2026
- journal article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 136 (10) , 103001
Abstract
We demonstrate that secondary ions sputtered from a macrocapillary's inner surface by the primary beam induce premature saturation of the guiding field, hindering fast ion guiding. By suppressing secondary ion sputtering with grooved surfaces, we achieve a guiding-field potential difference exceeding 1 kV, 2 orders of magnitude larger than previously achieved in stable ion guiding. This enables stable guiding of a 20-keV/q O^{5+} beam at offset angles up to 15°, with transmitted ions retaining their initial energy and charge state. A self-consistent field model accurately reproduces these results, revealing that guiding performance relies on managing secondary ions and the channel's voltage tolerance, while remaining robust against beam fluctuations. This Letter paves the way for ionic fibers that, much like optical fibers for light, passively and adaptively control ion transport.Keywords
Funding Information
- National Key Research and Development Program of China (2022YFA1602501)
- National Natural Science Foundation of China (12275328)
- National Natural Science Foundation of China (12175286)
- National Natural Science Foundation of China (11774356)
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