Optical enhancement cavities operated at GHz repetition rate in burst mode regime

Kevin Dupraz; Frédéric Blanc; Ronic Chiche; Aur{é}lien Martens; Antoine Courjaud; Loïc Amoudry; Titouan Le Barillec; Daniele Nutarelli; Yann Peinaud; Fabian Zomer

arXiv · 2609.37619

Optical enhancement cavities operated at GHz repetition rate in burst mode regime

Kevin Dupraz·Frédéric Blanc·Ronic Chiche·Aur{é}lien Martens·Antoine Courjaud·Loïc Amoudry·Titouan Le Barillec·Daniele Nutarelli·Yann Peinaud·Fabian Zomer

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Abstract

The design and experimental validation of a burst-mode optical cavity tailored for inverse Compton scattering X-ray sources is presented. The system is tailored for a room temperature linear accelerator operating at 880 MHz and utilizes a common-path injection scheme for both locking and burst laser pulses to optimize stability and simplicity. We detail the cavity construction, the laser system, and performance under two enhancement cavity finesse regimes (2000 and 7300), highlighting the sensitivity of cavity filling to carrier-envelope offset parameters. A theoretical model is developed to explain observed power dynamics and to guide optimization for high-energy storage. Our findings demonstrate reliable storage exceeding 300 mJ over 20 minutes, paving the way toward compact, high-flux inverse Compton scattering X-ray sources.

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Kevin Dupraz, Frédéric Blanc, Ronic Chiche, Aur{é}lien Martens, Antoine Courjaud, Loïc Amoudry, Titouan Le Barillec, Daniele Nutarelli, Yann Peinaud, Fabian Zomer. 2026-09-29. Optical enhancement cavities operated at GHz repetition rate in burst mode regime. https://arxiv.org/abs/2609.37619

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