Abstract
Attosecond duration relativistic electron bunches travelling through an undulator can generate brilliant coherent radiation in the visible to vacuum ultraviolet spectral range. We present comprehensive numerical simulations to study the properties of coherent emission for a wide range of electron energies and bunch durations, including space-charge effects. These demonstrate that electron bunches with r.m.s. duration of 50 as, nominal charge of 0.1 pC and energy range of 100–250 MeV produce 10^9 coherent photons per pulse in the 100–600 nm wavelength range. We show that this can be enhanced substantially by self-compressing negatively chirped 100 pC bunches in the undulator to produce 10^{14} coherent photons with pulse duration of 0.5–3 fs.
Highlights
Attosecond duration relativistic electron bunches travelling through an undulator can generate brilliant coherent radiation in the visible to vacuum ultraviolet spectral range
Several methods have been investigated for generating longitudinally coherent radiation from relativistic electron beams. These include coherent synchrotron r adiation[1], coherent transition r adiation[2], coherent Cherenkov radiation[3], coherent undulator radiation[4], free-electron lasers (FELs)[5,6], FELs driven by pre-bunched electron beams[7] and pre-bunched Cherenkov masers[8]
A Laser-wakefield accelerators (LWFAs) driven FEL was first proposed in 2 00228 and laser-driven synchrotron sources operating from the infrared[29] to the VUV30–32 have been demonstrated
Summary
Attosecond duration relativistic electron bunches travelling through an undulator can generate brilliant coherent radiation in the visible to vacuum ultraviolet spectral range. We present comprehensive numerical simulations to study the properties of coherent emission for a wide range of electron energies and bunch durations, including space-charge effects. Several methods have been investigated for generating longitudinally coherent radiation from relativistic electron beams These include coherent synchrotron r adiation[1], coherent transition r adiation[2], coherent Cherenkov radiation[3], coherent undulator radiation[4], free-electron lasers (FELs)[5,6], FELs driven by pre-bunched electron beams[7] and pre-bunched Cherenkov masers[8]. Conventional accelerators typically produce bunches with picosecond duration, or longer, and coherence is possible only in the microwave, terahertz or infrared spectral r egion[4,7,14,15] If these long bunches contain small-scale internal structure, coherent emission can extend to shorter wavelengths, such as in the optical k lystron[16]. We present start-to-end simulations of a laser-driven coherent synchrotron source
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