Abstract
Truly table-top sized radiation sources based on compact laser-plasma accelerators require compact and strong focusing devices and efficient short-period undulators. Complementing our recent theoretical work on the feasibility of a table-top FEL, we here present the design and successful experimental characterizations of a 5 mm period length undulator and miniature quadrupole magnets with field gradients of the order of $500\text{ }\text{ }\mathrm{T}/\mathrm{m}$.
Highlights
Over the past few years, laser-plasma acceleration of electrons [1,2,3] has rapidly advanced into a controllable technique [4,5] that is widely discussed for first applications
Appealing features of laser-plasma accelerators are the mm-scale size that is required for the generation of GeV electron energies [4] and the high peak currents of up to 100 kA combined with short bunch lengths on the 10 fs scale [6]. The latter suggests the application of laser-accelerated electron bunches as drivers for secondary light sources, either via incoherent synchrotron radiation [7], undulator radiation, or coherent FEL radiation [8]
A doublet of miniaturized highgradient quadrupole magnets is used for the imaging of the source to the compact undulator only about one meter downstream
Summary
Over the past few years, laser-plasma acceleration of electrons [1,2,3] has rapidly advanced into a controllable technique [4,5] that is widely discussed for first applications. Appealing features of laser-plasma accelerators are the mm-scale size that is required for the generation of GeV electron energies [4] and the high peak currents of up to 100 kA combined with short bunch lengths on the 10 fs scale [6]. The latter suggests the application of laser-accelerated electron bunches as drivers for secondary light sources, either via incoherent synchrotron radiation [7], undulator radiation, or coherent FEL (free-electron laser) radiation [8]. Applications of undulators in radiation generation and diagnostics of laser-plasma accelerated beams are discussed
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