Electron Gun is Where LCLS-II Begins (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption Berkeley Lab's Fernando Sannibale inspects the APEX (Advanced Photoinjector Experiment) that has served as a test electron gun and injector system for LCLS-II. The LCLS-II injector system will be located at the future X-ray laser's front end. It will produce bunches of electrons for the generation of X-ray pulses that are only quadrillionths of a second long, at rates of up to a million bunches per second. Credit (Credit: Roy Kaltschmidt/Berkeley Lab) Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.