500 MHz higher order mode damped cavity designed for 4th generation synchrotron radiation sources

Hao, Xuerui; Li, Zhongquan; Ye, Kuangkuang; Wang, Peilin; Wang, Geng; Li, Jian; Wang, J.

doi:10.1016/j.nima.2022.167273

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…Under the best conditions, the optimal leakage field rate is less than 0.2%. (1) 499.87 6.3×10 4 3.5×10 7 114.2 7.185 0.18 F (2) 499.87 6.4×10 4 4.0×10 7 --0.16 (1) E represents the results calculated using the Eigenmode method.…”

Section: Tm020 Mode Analysismentioning

confidence: 99%

“…To suppress higher-order modes, it employs two strategies: high-pass filtering waveguides strategically positioned on the cavity to extract parasitic modes, and EM absorbers at the beam port to dissipate their energy. This type of HOM-damped cavity effectively suppresses HOMs through the high-pass filtering characteristics of the waveguide, and it is necessary to extend the waveguide to a sufficient length to protect the accelerating mode [1][2][3] .…”

Section: Introductionmentioning

confidence: 99%

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High-fidelity TM020 Mode HOM-damped accelerating cavity: Overcoming electromagnetic field leakage to increase operating voltage tolerance

Hao,

Zhu,

et al. 2024

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Radiofrequency cavities play a crucial role in synchrotron light sources by replenishing beam energy and providing sufficient accelerating voltage. Compared to traditional TM010 cavities, TM020 cavities offer advantages such as higher quality factor, higher accelerating voltage, and lower characteristic impedance. Additionally, their unique field distribution allows strategic placement of dampers at radial nodes, effectively suppressing higher-order modes within a compact structure. However, the radiofrequency performance of cavity is highly sensitive to the placement of the higher-order modes coupling slot and the Electromagnetic(EM) field symmetry. These factors can easily lead to leakage of the accelerating mode, with the leaked energy absorbed by the absorber, whose power handling capacity is limited. Consequently, the leakage rate of the TM020 mode damping cavity becomes critical in limiting the achievable accelerating cavity voltage. This paper proposes a novel extraction scheme utilizing a circular waveguide structure and a waveguide-coaxial input coupler to significantly reduce accelerating field leakage, thereby achieving a high-fidelity TM020 cavity. A detailed design of a 500 MHz TM020 HOM-damped cavity is presented. Simulation results demonstrate that the energy leakage of the accelerating mode can be suppressed below 1% during operation.

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Section: Tm020 Mode Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%