Ultra-high efficiency bremsstrahlung production in the interaction of direct laser-accelerated electrons with high-Z material
P. Tavana, N. Bukharskii, M. Gyrdymov, U. Spillmann, Ş. Zähter, J. Cikhardt, N. G. Borisenko, Ph. Korneev, J. Jacoby, C. Spielmann, N. E. Andreev, M. M. Günther and O. N. Rosmej