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Etude et conception d'une cavité Fabry-Perot de haute finesse pour la source compacte de rayons X ThomX

Abstract : Inverse Compton Scattering provides a unique way to produce quasi-monochromatic X-rays via the interaction of relativistic electrons with a laser pulse. This process has the advantage of producing very high fluxes of X-rays with energies above a few tens of keV. In addition the output beam divergence is much larger than in classical synchrotron light sources and the X-ray beam is thus easier to manipulate. We present an X-ray source under construction at Paris-Sud University, ThomX. This source uses a 50 MeV electron beam that collides at 16.7 MHz with a few picoseconds pulsed laser beam whose power is enhanced at the state of the art 600 kW average power to produce X-rays between 30 and 50 keV with a flux of 10^{13} ph/s. This energy range as well as the energy-angular dependence coming from the physical process are suitable for societal applications like radiotherapy or art history.A very high finesse optical cavity (> 24000) is used as a prototype to perform R&D for the ThomX source. 400 kW of average laser power have been successfully stored in this cavity, using an input laser beam of only 40 W. This result, unique in the world, is a pathway towards the completion of the low-cost, compact, high flux X-ray source ThomX. This thesis explains the experimental and analytical studies that have been performed to reach this performance, including a generalization of the process of laser pulse stacking to frequency-detuned laser beams, and the methods developped for experimental spatial coupling enhancement.
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Pierre Favier. Etude et conception d'une cavité Fabry-Perot de haute finesse pour la source compacte de rayons X ThomX. Optique [physics.optics]. Université Paris-Saclay, 2017. Français. ⟨NNT : 2017SACLS412⟩. ⟨tel-01681075v2⟩

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