论文标题
连续旋转的超导磁轴承和对TES和鱿鱼的潜在影响的振动特征
Vibration characteristics of a continuously rotating superconducting magnetic bearing and potential influence to TES and SQUID
论文作者
论文摘要
我们测量了在液氮温度下运行的原型超导磁轴承（SMB）的振动。该原型系统被设计为Litebird低频望远镜（LFT）极化调制器单元的面包板型号。我们将振动幅度的上限设置为$ 36〜 \ MATHRM {μm} $以旋转同步频率。在旋转过程中，产生的磁场的振幅各不相同。通过此设置，我们计算了SMB磁场在LFT焦平面位置产生的磁场的静态和交流幅度为$ 0.24〜 \ MATHRM {G} $和$ 3 \ times10^{ - 5} $〜} $〜〜\ mathrm {g} $。从交流振幅中，我们计算$ 7 \ times10^{ - 8} $$〜\ mathrm {k} $的临界温度变化，而鱿鱼通量的分数变化为$Δφ/φ_0| _ {ac _ {ac} = 3.1 = 3.1 \ times10^{ - 5} $。机械振动还可以估计为$ 3.6 \ times 10^{ - 2} $$〜\ \ \ mathrm {n} $在旋转机构位置。
We measured the vibration of a prototype superconducting magnetic bearing (SMB) operating at liquid nitrogen temperature. This prototype system was designed as a breadboard model for LiteBIRD low-frequency telescope (LFT) polarization modulator unit. We set an upper limit of the vibration amplitude at $36~\mathrm{μm}$ at the rotational synchronous frequency. During the rotation, the amplitude of the magnetic field produced varies. From this setup, we compute the static and AC amplitude of the magnetic fields produced by the SMB magnet at the location of the LFT focal plane as $0.24~\mathrm{G}$ and $3\times10^{-5}$$~\mathrm{G}$, respectively. From the AC amplitude, we compute TES critical temperature variation of $7\times10^{-8}$$~\mathrm{K}$ and fractional change of the SQUID flux is $δΦ/Φ_0|_{ac}=3.1\times10^{-5}$. The mechanical vibration can be also estimated to be $3.6\times 10^{-2}$$~\mathrm{N}$ at the rotation mechanism location.
