We used transition radiation techniques instead of the original phosphor targets to improve the electronic beam diagnostic system at Beijing Free Electron Laser.The beam profile,size(3.3×2.4mm),position and divergence angle(σrms=2.5mrad)in transverse have been obtained from optical transition radiation.We also present the experimental set-up and some preliminary results.
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机译：Enhancement of Gain and Modified Electron Beam Trajectories Using a Relativistic Electron Beam With an Elliptical Cross Section in Free-Electron Laser With a Helical Wiggler and Ion-Channel Guiding
