Eupraxia, a step toward a plasma-wakefield based accelerator with high beam quality by Nghiem, PAP, Alesini, D, Aschikhin, A, Assmann, RW, Audet, T, Beck, A, Chance, A, Chen, M, Chiadroni, E, Cianchi, A, Clarke, JA, Couprie, ME, Croia, M, Cros, B, Dattoli, G, Del Dotto, A, Delerue, N, Dorda, U, Ferran Pousa, A, Ferrario, M, Fonseca, RA, Ghaith, A, Giribono, A, Gizzi, LA, Helm, A, Hidding, B, Hooker, SM, Ibison, MG, Jaroszynski, DA, Kruchinin, KO, Labate, L, Lee, P, Li, X, Li, FY, Libov, V, Marchetti, B, Martinez De La Ossa, A, Marx, D, Massimo, F, Mathieu, F, Maynard, G, Mazzotta, Z, Mehrling, TJ, Molodozhentsev, AY, Mosnier, A, Mostacci, A, Najmudin, Z, Nguyen, F, Niknejadi, P, Oumbarek Espinos, D, Pattathil, R, Pompili, R, Romeo, S, Rossi, AR, Schaper, L, Sheng, ZM, Shpakov, V, Silva, LO, Silva, T, Simon, C, Specka, A, Stella, A, Streeter, MJV, Svystun, EN, Symes, D, Terzani, D, Toci, G, Tomassini, P, Vaccarezza, C, Vieira, JM, Vujanovic, M, Walczak, R, Walker, PA, Weikum, MK, Welsch, CP, Weng, SM, Wiggins, SM, Wolfenden, J, Yoffe, S, Zhu, J