Speaker
Description
Low-emittance microbunched electron beams are a key ingredient in free-electron lasers (FELs), facilitating gain and coherence in radiation production. It has been proposed, such as by the Compact X-ray FEL (CXFEL) group at Arizona State University, that nano-scale microbunching could be produced by rotating transverse beamlets into the longitudinal plane. Such a technique could make short-wavelength FELs much more compact, reducing cost. Thus, a collaboration has been formed to test this principle using the emittance exchange (EEX) beamline of the Argonne Wakefield Accelerator (AWA). ** This experiment will take micro-scale transverse modulations on a TEM grid and produce mico-to-nano scale microbunches. Performing this with AWA’s 40 MeV electron beam will require low normalized emittance (~50 nmrad), and low charge (~1pC) electron bunches that are not commonly produced at AWA. These proceedings will detail our work to produce and characterize this low emittance in the AWA beamline.
Footnotes
G. Ha et al., Nucl. Inst. and Methods A, vol. 1075, p. 170387, Jun. 2025.
*R. Margraf-O'Neal et al., Proc. NAPAC2025, Sacramento, CA, USA, pp. 173-176, Aug. 2025.
Funding Agency
This work is supported by the U. S. Department of Energy, under contract No. DE-AC02-06CH11357.
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