What is it about?

A direct simultaneous detection of electron ($e^-$) and positron ($e^+$) bunches was successfully performed using wideband beam monitors and a detection system at the $e^+$ capture section of the SuperKEKB B-factory. The time intervals between the secondary-generated $e^-$ and $e^+$ bunches were measured to investigate their dynamical capture process.

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Why is it important?

The results show that the time intervals were measured in the range of 20--280 ps on average, and the line-order switch of the $e^-$ and $e^+$ bunches and their dynamical phase-slip process in the axial direction were clearly observed as a function of the capture phase of accelerating structures.


In this report, the dynamical capture and phase-slip process for the $e^-$ and $e^+$ bunches under the two-bunch acceleration scheme is described in detail. This study opens up a new window for direct observation of the $e^-$ and $e^+$ capture process at any present and future $e^+$ sources.

Dr. Tsuyoshi Suwada
High Energy Accelerator Reseach Organization (KEK)

Read the Original

This page is a summary of: Direct observation of positron capture process at the positron source of the superKEKB B-factory, Scientific Reports, November 2022, Springer Science + Business Media,
DOI: 10.1038/s41598-022-22030-5.
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