High Efficiency Energy Extraction from a Relativistic Electron Beam in a Strongly Tapered Undulator
High Efficiency Energy Extraction from a Relativistic Electron Beam in a Strongly Tapered Undulator
We present results of an experiment where, using a 200 GW CO2 laser seed, a 65 MeV electron beam was decelerated down to 35 MeV in a 54 cm long strongly tapered helical magnetic undulator, extracting over 30$\%$ of the initial electron beam energy to coherent radiation. These results demonstrate …