The quality factor of a superconducting rf resonator in a magnetic field.
The quality factor of a superconducting rf resonator in a magnetic field.
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磁场中超导射频谐振器的品质因数。
DOI：
10.1063/1.3271537
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
J. Walz
中科院分区：
文献类型：
--
作者：
S. Ulmer;H. Kracke;K. Blaum;S. Kreim;A. Mooser;W. Quint;C. C. Rodegheri;J. Walz
研究了1.6 MHz超导NbTi谐振器在1.2 T磁场下的质量因子及其与温度的关系。在超导表面电阻中观察到磁滞效应作为磁场的函数。在3.9 K时，谐振器的卸载q值为40,500。结果表明，该q值受线圈线的FORMVAR绝缘中的介电损耗的限制。讨论了q值优化的细节。在温度依赖性中，在T约= 7.5 K以上观察到q值急剧下降。最后，详细讨论了这些测量结果对实际陷阱实验的影响。
The quality factor of a superconducting NbTi resonator at 1.6 MHz in a magnetic field up to 1.2 T as well as its temperature dependence is investigated. A hysteresis effect in the superconducting surface resistance as a function of the magnetic field is observed. An unloaded Q-value of the resonator of 40,500 is achieved at 3.9 K. It is shown that this Q-value is limited by dielectric losses in the FORMVAR insulation of the coils wire. The details of the Q-value optimization are discussed. In the temperature dependence of the Q-value a steep decrease is observed above T approximately = 7.5 K. Finally, the implications of these measurements for real trap experiments are discussed in detail.