1 September 1995 Reflectron design for femtosecond electron guns
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We apply the reflectron principle to design an electron gun capable of delivering femtosecond duration electron pulses. The gun is based on photoemission and uses a high repetition rate femtosecond laser system. We show that even at low laser power electrons are generated in a multiphoton process, generating an electron beam with a significant energy spread. The temporal broadening resulting from this distribution can be partially compensated by a reflective electron mirror. Our reflectron features a gridless mirror that focuses the electron pulses in space and time. Computer simulations highlight the important design parameters and demonstrate that pulse durations of hundreds of femtoseconds are achievable, even in cases of broad kinetic energy distributions. The reflectron is very accommodating toward space charge effects, making it an attractive choice in applications requiring high electron densities.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Peter M. Weber, Peter M. Weber, Scott D. Carpenter, Scott D. Carpenter, Tamas Lucza, Tamas Lucza, } "Reflectron design for femtosecond electron guns", Proc. SPIE 2521, Time-Resolved Electron and X-Ray Diffraction, (1 September 1995); doi: 10.1117/12.218364; https://doi.org/10.1117/12.218364

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