Electron bunch diagnostics for laser-plasma accelerators, from THz to X-rays

Abstract : This thesis presents a series of single-shot non-intrusive diagnostics of key attributes of electron bunches produced by a laser-plasma accelerator (LPA). Three injection mechanisms of the LPA are characterized: channeled and self-guided self-injection, plasma down-ramp injection, and two-beam colliding pulse injection. New diagnostic techniques are successfully demonstrated: up to 8 times higher sensitivity wavefront sensor-based plasma density measurements, strong spatiotemporal coupling of the focused THz pulse is demonstrated using the temporal electric-field cross-correlation (TEX) of a long chirped probe with a short probe and confirms the two-component structure of the bunch observed by electron spectrometry, and normalized transverse emittances as low as 0.1 mm mrad are demonstrated for 0.5 GeV-class beams produced in a capillary-guided LPA by characterizing the betatron radiation emitted by the electrons inside the plasma using a new single-shot X-ray spectroscopy technique.
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Contributor : Guillaume Plateau <>
Submitted on : Tuesday, April 17, 2012 - 8:39:19 PM
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Guillaume Plateau. Electron bunch diagnostics for laser-plasma accelerators, from THz to X-rays. Plasma Physics [physics.plasm-ph]. Ecole Polytechnique X, 2011. English. ⟨pastel-00682452⟩

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