August 2010—Laser-plasma accelerators can produce high-energy electron beams with an emittance as good as beams from state-of-the-art conventional accelerators for free electron lasers and gamma-ray sources. The emittance of LPA beams has been measured using a new technique based on single-shot x-ray spectroscopy. The research appears in Physical Review Letters: “Low-emittance electron bunches from a laser-plasma accelerator measured using single-shot x-ray spectroscopy,” by G.R. Plateau, C.G.R. Geddes, D.B. Thorn, M. Chen, C. Benedetti, E. Esarey, A. J. Gonsalves, N.H. Matlis, K. Nakamura, C. B. Schroeder, S. Shiraishi, T. Sokollik, J. van Tilborg, Cs. Toth, S. Trotsenko, T. S. Kim, M. Battaglia, Th. Stöhlker, and W.P. Leemans, August 2010. For more information, see this LBNL press release. The technical paper is available here.