NAPAC25 - North American Particle Accelerator Conference 2025

Low-charge, high-resolution beamline preparation for the nanopatterned microbunching experiment at Argonne Wakefield Accelerator

MOP055

11 Aug 2025, 16:00

2h

Ballroom A (SAFE Credit Union Convention Center)

Poster Presentation MC6 - Beam Instrumentation, Controls, AI/ML, and Operational Aspects Monday Poster Session

Speaker

Rachel Margraf-O'Neal (Argonne National Laboratory)

Description

The emittance exchange (EEX) beamline at the Argonne Wakefield Accelerator (AWA) is designed to transfer properties of an electron beam phase space between the transverse and longitudinal planes. Recently, it has been proposed this beamline could be used to convert a microscale transverse modulation created by a TEM grid into a microbunch train in the longitudinal plane. Such a technique would be useful for obtaining nano-scale microbunching that does not rely on the sensitive process of FEL gain. This new approach has been proposed to enable development of a compact free-electron laser at Arizona State, greatly reducing size and cost compared with existing short wavelength FELs. To perform an exploratory demonstration of this concept at AWA, this experiment requires low normalized emittance (~50 nmrad), low charge (~1pC) electron bunches, and transverse diagnostics with high-resolution (1-3 microns) and high-light-collection to resolve the modulation on the electron beam. This report will give a progress update on preparing the necessary beams and diagnostics at AWA for an emittance exchange experiment that would produce 100s of nm scale microbunches.

Funding Agency

This work is supported by the U. S. Department of Energy, under contract No. DE-AC02-06CH11357.

Footnotes

*G. Ha et al., “Coherent radiation from initially modulated beams using emittance exchange at the Argonne Wakefield Accelerator,” Nucl. Inst. and Methods A, vol. 1075, p. 170387, Jun. 2025.