Generation of multicolor radiation in the hard x-ray regime based on inverse Compton scattering with electron beam trains is discussed. We investigate high quality beam production in plasma electron accelerators to provide temporal and spectral spacing for subsequent radiation pulses. Properties of beam pairs can be tuned independently and allow a broad range of photon energies and delays of up to 100 fs and narrow bandwidth on the order of a few percent.
Multicolor radiation in the x-ray regime has a broad range of applications. One approach involves the generation of pairs or trains of electron bunches with determined spectral and temporal spacing applied to radiation production. We present a combined scheme of inverse Compton scattering and plasma electron acceleration based on laser electron injection into a nonlinear. beam-driven plasma wave. The high accelerating fields synergize with the strong scaling of the inverse Compton scattering process and enable pulse energies above the capabilities of current free electron lasers within a compact device.
Independent ionizing laser pulses decouple the generation of each electron beam from the others and enable individual beam characteristics. We therefore obtain high tunability regarding emitted radiation pulse parameters in terms of the amount of scattered photons, their energy and bandwidth, as well as the temporal and spectral spacing between multiple pulses.
Using the example of the underdense plasma photocathode acceleration concept, production of high quality pulses with narrow bandwidth due to the low inherent beam emittance and energy spread may be achieved, as indicated by PIC-simulations. A large variety of pulse energies and delays in the range of few up to the order of 100 fs can be realized, while the individual bandwidth of each pulse can be on the level of a few percent.
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