Transverse interferometry of a hydrogen-filled capillary discharge waveguide |
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Authors: | Gonsalves A J Rowlands-Rees T P Broks B H P van der Mullen J J A M Hooker S M |
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Institution: | Department of Physics, University of Oxford, Clarendon Laboratory, Oxford OX1 3PU, United Kingdom. |
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Abstract: | Transverse interferometric measurements are presented of the plasma channel formed in a hydrogen-filled capillary discharge waveguide recently used to generate 1 GeV electrons in a laser-driven plasma accelerator for the first time. The measurements were found to be in good agreement with nonlocal thermal equilibrium simulations, but showed significant differences with the results of a quasistatic model developed by Bobrova et al. Phys. Rev. E. 65, 016407 (2001)]. The measurements are used to determine scaling laws for the axial electron density and matched spot size of the plasma channel, enabling optimization of the channel to specific applications. |
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