10–15 Aug 2025
SAFE Credit Union Convention Center
America/Los_Angeles timezone

Optimizing 4D emittance measurements using the pinhole scan technique

TUP075
12 Aug 2025, 16:00
2h
SAFE Credit Union Convention Center

SAFE Credit Union Convention Center

1401 K St, Sacramento, CA 95814
Poster Presentation MC5 – Beam Dynamics and EM Fields TUP: Tuesday Poster Session

Speaker

Peter Owusu (Arizona State University)

Description

Accurate measurement of electron beam emittance is essential for optimizing high-brightness electron sources. The Pinhole Scan Technique measures the 4D phase space and hence the emittance by measuring the beam profile after clipping the beam using a pinhole followed by a drift section and then scanning the beam over the pinhole. This technique has been implemented in low (< 200 keV) beamlines at both Cornell university and Arizona State University. However, the technique poses several practical challenges. In this work, we analyze and address key issues affecting the 4D phase space and emittance measurements using this technique. We identify and investigate sources of inaccuracies like the pinhole aspect ratio, beam divergence, position-momentum correlations in the phase space, and the point-spread-function of the detector and suggest techniques to minimize them. Our findings offer a pathway to more accurate 4D phase space characterization in advanced electron beam systems.

Funding Agency

US National Science Foundation
US Department of Energy

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Author

Peter Owusu (Arizona State University)

Co-authors

Charles Zhang (Cornell University) Adam Bartnik (Cornell University) Jared Maxson (Cornell University) Siddharth Karkare (Cornell University)

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