What question did this study set out to answer?

This work aims to measure and analyze the ultralow emittance of electron beams at the APS–U.

February 2, 2026Open Access

Measurements of ultralow emittance and transverse coherence at the Advanced Photon Source Upgrade storage ring

Key Points

This work aims to measure and analyze the ultralow emittance of electron beams at the APS–U.
Conducted measurements of electron beam emittance below 50 pm rad.
Provided a status update on the beam size monitor at APS–U.
Examined measurement techniques across several laboratories.
Achieved an electron beam emittance of less than 50 pm rad.
Demonstrated improved performance in beam size among electron storage ring light sources.
Highlighted various measurement techniques with recent updates.

Abstract

Recent electron storage ring light sources continue to push towards increasingly lower electron beam sizes. In the present work, we report on the measurements of the electron beam emittance (sub 50 pm rad) achieved at the Advanced Photon Source Upgrade (APS–U), as well as its standing among electron storage ring light sources. We include a brief status update on the beam size monitor beamline at the APS–U. We conclude with a survey of measurement techniques and recent results across multiple laboratories.

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