Simulation of the dynamical transmission of 100 eV positrons through a conical capillary

The simulation of 100 eV positrons transmitted in conical capillary was performed with inserted beam intensity from 0.04 fA/mm2 to 10 fA/mm2. At lower injected intensity of sub-fA, the transmission profile is geometrical and dominated by direct transmission. As the tilt angle increases, the intensit...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Beam interactions with materials and atoms, 2024-04, Vol.549, p.165264, Article 165264
Main Authors: Yang, Aixiang, Zhou, Dianwei, Han, Chengzhi, Chen, Ximeng, Shao, Jianxiong
Format: Article
Language:English
Subjects:
Guiding effect
Positron
The conical capillary
The elastic and inelastic collisions
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Summary:The simulation of 100 eV positrons transmitted in conical capillary was performed with inserted beam intensity from 0.04 fA/mm2 to 10 fA/mm2. At lower injected intensity of sub-fA, the transmission profile is geometrical and dominated by direct transmission. As the tilt angle increases, the intensity of the transmitted positron decreases rapidly, which is consistent with the experimental data. After increasing injected current intensities to several fA/mm2, charge deposited in the capillary significantly enhances the transmission rate, and the positrons can transmit the capillary with larger tilt angles. The transmitted current density is shown to increase up to a factor of 4.8 with respect to the injected one. These results provide evidence that the low-energy positrons can be guided and significantly focused by insulating conical capillary.
ISSN:0168-583X
1872-9584
DOI:10.1016/j.nimb.2024.165264