Enhanced acceleration of injected electrons in a laser-beat-wave-induced plasma channel |
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Authors: | Tochitsky S Ya Narang R Filip C V Musumeci P Clayton C E Yoder R B Marsh K A Rosenzweig J B Pellegrini C Joshi C |
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Institution: | Neptune Laboratory, Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA. |
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Abstract: | Enhanced energy gain of externally injected electrons by a approximately 3 cm long, high-gradient relativistic plasma wave (RPW) is demonstrated. Using a CO2 laser beat wave of duration longer than the ion motion time across the laser spot size, a laser self-guiding process is initiated in a plasma channel. Guiding compensates for ionization-induced defocusing (IID) creating a longer plasma, which extends the interaction length between electrons and the RPW. In contrast to a maximum energy gain of 10 MeV when IID is dominant, the electrons gain up to 38 MeV energy in a laser-beat-wave-induced plasma channel. |
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