Abstract
We report observations of coherent optical transition radiation interferometry (COTRI) patterns generated by microbunched ∼200-MeV electrons as they emerge from a laser-driven plasma accelerator. The divergence of the microbunched portion of electrons, deduced by comparison to a COTRI model, is ∼9× 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 μm. The combined results show that the microbunched distribution has estimated transverse normalized emittance ∼0.4 mm mrad.
Highlights
Periodic longitudinal density modulation of relativistic electron beams (e beams) at optical wavelengths gives rise to coherent light emission in such forms as synchrotron radiation, including the free-electron laser (FEL) [1,2], and optical transition radiation (OTR) in its coherent form (COTR)
We report observations of coherent optical transition radiation interferometry (COTRI) patterns generated by microbunched ∼200-MeV electrons as they emerge from a laser-driven plasma accelerator
The latter has been observed from FELs [3,4] and laser-driven plasma accelerators (LPAs) [5,6,7]
Summary
Periodic longitudinal density modulation of relativistic electron beams (e beams) at optical wavelengths (microbunching) gives rise to coherent light emission in such forms as synchrotron radiation, including the free-electron laser (FEL) [1,2], and optical transition radiation (OTR) in its coherent form (COTR). We report observations of coherent optical transition radiation interferometry (COTRI) patterns generated by microbunched ∼200-MeV electrons as they emerge from a laser-driven plasma accelerator.
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