Dr. Xing Liu Profile

Dr. Xing Liu

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Proceedings Article | 15 December 2022 Paper

High-power prototype optical enhancement cavity design for steady-state microbunching

Xinyi Lu, Xing Liu, Huan Wang, Lixin Yan

Proceedings Volume 12478, 1247803 (2022) https://doi.org/10.1117/12.2645400

KEYWORDS: Laser engineering, Cavity resonators, Light sources, Mirrors, Thermal effects, Prototyping, Modulation, Spherical lenses, Continuous wave operation, High power lasers, Thermography, Optical design

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We present a highly stable, high-power bow-tie optical enhancement cavity (OEC) for providing modulating electric fields in steady-state microbunching (SSMB) experiments. The goals include an intra-cavity circulating power of up to 1 MW; a laser beam waist with a radius of several hundred micrometers; high optical and mechanical stability; and the OEC will be coupled with an electronic storage ring. The design and simulation results of the setup are presented, including optical parameters, mechanical design, and thermal simulation. The planar four-mirror (4M) bow-tie cavity is selected to integrate with the electron storage ring, consisting of two concave focusing mirrors and two plane mirrors. The round-trip length of the cavity is 9.317 m, corresponding to an FSR of 32.177 MHz. The cavity round-trip loss is 226 ppm, with an ideal cavity gain of 14,096 and a finesse of 27,800. The mirror surface thermoelastic deformation and cavity parameters at high circulating power are described by Winkler model and thermal effect simulation tools. Although this design is oriented toward SSMB, such highly stable, high-power OECs are also desirable in various fields.

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