Laser wakefield simulations towards development of compact particle accelerators by Geddes, C, Bruhwiler, D, Cary, JR, Cormier-Michel, E, Esarey, E, Schroeder, C, Isaacs, W, Stinus, N, Messmer, P, Hakim, A, Nakamura, K, Gonsalves, A, Panasenko, D, Plateau, G, Toth, C, Nagler, B, Van Tilborg, J, Cowan, T, Hooker, S, Leemans, W