Objectives

O1: Optimization of the Multi-GeV electron beam: Stringent electron beam parameters are needed for a clear ICS signature: electron beam energy, bandwidth, charge and stability. Density gradient injection scheme will be used to deliver the stable quasi-monoenergetic electron beam.

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O2: Advanced photon detection: good gamma beam characterization in the MeV range is not trivial. We rely on scintillators and Compton spectrometers.

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O3: Single Laser Beam Compton Scattering:  Two-beam electron-laser collision experiments are challenging due to the difficulty of overlapping the electron beam and laser pulse (spatially and temporally), limiting the number of collisions. To overcome this, in the first stage of the project we will start with single laser beam runs, where the laser unspent by the wakefield acceleration is tightly send back with a thin plasma mirror to scatter the electron beam.

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O4: Optimization of the Collison Parameters via advanced modeling: State of the art PIC simulations will be used to optimize the LWFA electron bunches. Subsequently, we will evaluate numerically the nonlinear Compton Scattering and the radiation-reaction effects between the optimized electron beam and a counterpropagating focused high power laser beam.

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O5: Dual Beam Compton Scattering. Once the two ELI-NP laser arms will be synchronized we will expand our experiments to cover the desired parameter space. Multi-GeV electron beams with unprecedently high intensity scatterer laser focus.