Laboratory realization of relativistic pair-plasma beams by Arrowsmith, CD, Simon, P, Bilbao, PJ, Bott, AFA, Burger, S, Chen, H, Cruz, FD, Davenne, T, Efthymiopoulos, I, Froula, DH, Goillot, A, Gudmundsson, JT, Haberberger, D, Halliday, JWD, Hodge, T, Huffman, BT, Iaquinta, S, Miniati, F, Reville, B, Sarkar, S, Schekochihin, AA, Silva, LO, Simpson, R, Stergiou, V, Gregori, G