Fig. 1. Schematic of cryomodule structure and test point layout

Fig. 2. Test site photographs

Fig. 3. Superconducting cavity cooling curve

Fig. 4. Integral displacements of vertical mechanical vibration of superconducting cavity

Fig. 5. Power spectral densities of POST vertical displacement at different temperatures

Fig. 6. Power spectral densities of vertical displacement of superconducting cavity at different temperatures

Fig. 7. Amplitudes of the frequency response function

Fig. 8. Integral displacements of transverse mechanical vibration of superconducting cavity

Fig. 9. Power spectral densities of POST transverse displacement at different temperatures

Fig. 10. Power spectral densities of transverse displacement of superconducting cavity at different temperatures

Fig. 11. Amplitudes of frequency response function