INTERFEROMETRIC OPTICAL SIGNATURE OF ELECTRON MICROBUNCHING IN LASER-DRIVEN PLASMA ACCELERATORS

Journal Article · Thu Aug 01 00:00:00 EDT 2019 · Phys.Rev.Lett

OSTI ID:1556949

Lumpkin, A. H. ^[1]; LaBerge, M. ^[2]; Rule, D. W. ^[3]; Zgadzaj, R. ^[2]; Hannasch, A. ^[2]; Zarini, O. ^[4]; Bowers, B. ^[2]; Orman, A, ^[5]; Couperus Cabadag, J. P. ^[5]; Debus, A. ^[5]; Kohler, A. ^[4]; Schramm, U. ^[6]; Downer, M. C. ^[2]

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1. Fermilab
2. Texas U.
3. Silver Spring
4. Dresden, Tech. U.
5. HZDR, Dresden
6. Dresden Tech. U.

We report observations of coherent optical transition radiation interferometry (COTRI) patterns generated by microbunched ~200-MeV electrons as they emerge from a laser-plasma accelerator. The divergence of the microbunched portion of electrons, deduced by comparison to an analytical COTRI model, is ~6x smaller than the ~3 mrad ensemble beam divergence, while the radius of the microbunched beam, obtained from COTR images on the same shot, is < 3 microns. The combined results show that the microbunched distribution has estimated transverse normalized emittance ~0.5 mm mrad.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1556949
• Report Number(s): FERMILAB-PUB-19-081-AD; 1748259
• Journal Information: Phys.Rev.Lett, Journal Name: Phys.Rev.Lett
• Country of Publication: United States
• Language: English

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