Downramp-assisted underdense photocathode electron bunch generation in plasma wakefield accelerators.

A. Knetsch, O. Karger, G. Wittig, H. Groth, Y. Xi, A. Deng, J.B. Rosenzweig, D.L. Bruhwiler, J. Smith, D.A. Jaroszynski, Z.-M. Sheng, G.G. Manahan, G. Xia, S.P. Jamison and B. Hidding, “Downramp-assisted underdense photocathode electron bunch generation in plasma wakefield accelerators,” Phys. Rev. Lett. (2016), submitted.