As an alternative to Compton backscattering and bremsstrahlung, the process of colliding high-energy electron beams with strong laser fields can more efficiently provide both a cleaner and brighter source of photons in the multi-GeV range for fundamental studies in nuclear and quark-gluon physics. In order to favor the emission of high-energy quanta and minimize their decay into electron-positron pairs, the fields must not only be sufficiently strong, but also well localized. We here examine these aspects and develop the concept of a laser-particle collider tailored for high-energy photon generation. We show that the use of multiple colliding laser pulses with 0.4 PW of total power is capable of converting more than 18% of multi-GeV electrons passing through the high-field region into photons, each of which carries more than half of the electron initial energy.

Department of Physics Chalmers University of Technology SE 41296 Gothenburg Sweden

Department of Physics University of Gothenburg SE 41296 Gothenburg Sweden

Institute of Applied Physics Russian Academy of Sciences Nizhny Novgorod 603950 Russia

Institute of Physics ASCR v v i ELI Beamlines Project 182 21 Prague Czech Republic

Kansai Photon Science Institute National Institutes for Quantum and Radiological Science and Technology 8 1 7 Umemidai Kizugawa Kyoto 619 0215 Japan

Lawrence Berkeley National Laboratory Berkeley California 94720 USA

Lobachevsky State University of Nizhni Novgorod Nizhny Novgorod 603950 Russia

Prokhorov General Physics Institute RAS Vavilov street 38 Moscow 119991 Russia

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