Lawrence Berkeley National Laboratory

esults are presented on the generation of quasi-monoenergeticelectron beams with energy up to 1GeV using a 40TW laser and a 3.3 cm-long hydrogen-filled capillary discharge waveguide. Electron beams were not observed without a plasma channel, indicating that self-focusing alone could not be relied upon for effective guidingof the laser pulse. Results are presented of the electronbeam spectra, and the dependence of the reliability of producingelectron beams as a function of laser and plasma parameters.