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High Q-factor superconducting radio-frequency (SRF) cavities are extremely sensitive to mechanical vibrations, which can cause a shift in the electromagnetic resonance frequency, degrading the cavity performance. To avoid this phenomenon (i.e. microphonics) specifically designed vibration suppression systems are needed. In this paper, the numerical model of the Vertical Test Stand (VTS) insert adopted at the Fermi National Accelerator Laboratory was studied, in the framework of the experimental characterization of Dark SRF cavities conducted by the SQMS (Superconducting Quantum Materials and Systems) center. Vibration testing was performed on the actual system to validate and tune the model, and a good correlation between numerical and experimental results was found. Additionally, two different setups were compared, with and without implementing a preliminary passive vibration suppression system, to assess its effectiveness in reducing the microphonics phenomenon. The obtained results allowed for the design of an improved isolation system, which will be the subject of future experimental testing (FERMILAB-CONF-24-0134-SQMS-TD).

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Cryogenic Vertical Test Stand Dynamic Model and Experimental Validation for Vibration Suppression

  • 会议论文

  • 发表日期：

    2025年

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  • Paolo Neri,
  • Sandro Barone,
  • Alessandro Paoli,
  • Crispin Contreras-Martinez,
  • Yuriy Pischalnikov,
  • Oleg Pronitchev,
  • Bianca Giaccone

摘要

High Q-factor superconducting radio-frequency (SRF) cavities are extremely sensitive to mechanical vibrations, which can cause a shift in the electromagnetic resonance frequency, degrading the cavity performance. To avoid this phenomenon (i.e. microphonics) specifically designed vibration suppression systems are needed. In this paper, the numerical model of the Vertical Test Stand (VTS) insert adopted at the Fermi National Accelerator Laboratory was studied, in the framework of the experimental characterization of Dark SRF cavities conducted by the SQMS (Superconducting Quantum Materials and Systems) center. Vibration testing was performed on the actual system to validate and tune the model, and a good correlation between numerical and experimental results was found. Additionally, two different setups were compared, with and without implementing a preliminary passive vibration suppression system, to assess its effectiveness in reducing the microphonics phenomenon. The obtained results allowed for the design of an improved isolation system, which will be the subject of future experimental testing (FERMILAB-CONF-24-0134-SQMS-TD).