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To meet the energy compensation requirements of Steady-State Micro-Bunching (SSMB), a 20 MHz RF cavity with extreme axial compactness is essential. This paper presents an innovative triple-folded quarter-wave cavity design that overcomes the size limitations of conventional structures. Based on cascaded transmission line theory, we established an analytical model to optimize the cavity’s shunt impedance and tuning range. A triple-folded 20 MHz prototype was designed and validated via CST simulations, showing that the axial length is compressed to 1.25 m (approximately 1/3 the length of a standard QWC) while achieving a high shunt impedance of 558 kΩ with excellent thermal stability. This compact design offers a high-efficiency solution for low-frequency RF systems.
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