Paper | Title | Page |
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WE6RFP066 | Optical Diagnostic for Off-Axis Electrons in a Laser Wakefield Accelerator | 2948 |
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Funding: This work is supported by the Office of Naval Research and the Department of Energy Theoretical work* on electro-optic shock produced from the interaction of intense laser radiation with ~1% critical plasma suggests that second harmonic radiation will be emitted at the Cherenkov angle. This radiation pattern is produced under similar conditions as when off-axis electrons** were observed. These electrons are of particular interest since they are well suited for external injection into a laser wakefield acceleration structure. Recent experimental results at the U.S. Naval Research Laboratory, using a 10 TW, 50 fs, Ti-Sapphire laser, have shown the existence of such a second harmonic ring. Characterization of this optical radiation and its relationship to off-axis electrons will be presented. *D. F. Gordon et al., Phys. Rev. Lett. {10}1, 45004 (2008). |