The ability to create matter from light is amongst the most striking predictions of quantum electrodynamics. Experimental signatures of this have been reported in the scattering of ultra-relativistic electron beams with laser beams1,2, intense laser–plasma interactions3 and laser-driven solid target scattering4. However, all such routes involve massive particles. The simplest mechanism by which pure light can be transformed into matter, Breit–Wheeler pair production (γγ′ → e+e−)5, has never been observed in the laboratory. Here, we present the design of a new class of photon–photon collider in which a gamma-ray beam is fired into the high-temperature radiation field of a laser-heated hohlraum. Matching experimental parameters to current-generation facilities, Monte Carlo simulations suggest that this scheme is capable of producing of the order of 105 Breit–Wheeler pairs in a single shot. This would provide the first realization of a pure photon–photon collider, representing the advent of a new type of high-energy physics experiment.
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This work was supported by the Engineering and Physical Sciences Research Council, the John Adams Institute (STFC) and the Atomic Weapons Establishment, Aldermaston. The authors thank A. Di Piazza and C.H. Keitel for helpful comments.
The authors declare no competing financial interests.
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Pike, O., Mackenroth, F., Hill, E. et al. A photon–photon collider in a vacuum hohlraum. Nature Photon 8, 434–436 (2014). https://doi.org/10.1038/nphoton.2014.95
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