Vibration Characteristics of a Continuously Rotating Superconducting Magnetic Bearing and Potential Influence to TES and SQUID

We measured the vibration of a prototype superconducting magnetic bearing (SMB) operating at liquid nitrogen temperature. This system was designed as breadboard model for LiteBIRD low-frequency telescope (LFT) polarization modulator unit. set an upper limit amplitude 36 $$\mu m$$ rotational synchronous frequency. During rotation, field produced varies. From this setup, we compute static and AC fields by SMB magnet location LFT focal plane 0.24 $$3\times 10^{-5}$$ G, respectively. amplitude, TES critical temperature variation $$7\times 10^{-8}$$ K fractional change SQUID flux is $$\delta \Phi /\Phi _0|_\mathrm{ac}=3.1\times . The mechanical can be also estimated to $$3.6\times 10^{-2}$$ N rotation mechanism location.