Abstract
A novel approach to implement and control electron injection into the accelerating phase of a laser wakefield accelerator is presented. It utilizes a wire, which is introduced into the flow of a supersonic gas jet creating shock waves and three regions of differing plasma electron density. If tailored appropriately, the laser plasma interaction takes place in three stages: Laser self-compression, electron injection, and acceleration in the second plasma wave period. Compared to self-injection by wave breaking of a nonlinear plasma wave in a constant density plasma, this scheme increases beam charge by up to 1 order of magnitude in the quasimonoenergetic regime. Electron acceleration in the second plasma wave period reduces electron beam divergence by $\ensuremath{\approx}25%$, and the localized injection at the density downramps results in spectra with less than a few percent relative spread.
Highlights
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A novel approach to implement and control electron injection into the accelerating phase of a laser wakefield accelerator is presented. It utilizes a wire, which is introduced into the flow of a supersonic gas jet creating shock waves and three regions of differing plasma electron density
Self-injection [12,13,14] is inferior to most schemes with external injection control, such as colliding pulse techniques [15,16,17,18], ionization injection [19,20], or gradients in plasma electron density [21,22,23,24], which are used in this experiment
Summary
Citation for published version (APA): Burza, M., Gonoskov, A., Svensson, K., Wojda, F., Persson, A., Hansson, M., Genoud, G., Marklund, M., Wahlström, C-G., & Lundh, O. (2013).
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