1. Centre for Plasma Physics, School of Mathematics and Physics, Queen’s University Belfast, Belfast BT7 1NN, United Kingdom
2. INFN-Laboratori Nazionali del Sud (LNS-INFN), Via S Sofia 62, Catania 95123, Italy
3. Physics and Astronomy Department, University of Catania, Via S Sofia 64, Catania 95123, Italy
4. Institute of Physics ASCR, v.v.i. (FZU), ELI-Beamlines Project, 18221 Prague, Czech Republic
5. Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
6. Extreme Light Infrastructure-Nuclear Physics (ELI-NP), Horia Hulubei Institute for Nuclear Physics (IFIN-HH), Str. Reactorului no. 30, P.O. Box MG-6, Măgurele-Bucharest 077126, Romania
7. Department of Physics, SUPA, University of Strathclyde, Glasgow G4 0NG, United Kingdom
8. LULI, Ecole Polytechnique, CNRS, CEA, UPMC, 91128 Palaiseau, France
9. National Physical Laboratory, Hampton Rd., Teddington TW11 0LW, Middlesex, United Kingdom