Radio frequency self-resonant coil for contactless AC-conductivity in 100 T class ultra-strong pulse magnetic fields
Radio frequency self-resonant coil for contactless AC-conductivity in 100 T class ultra-strong pulse magnetic fields
复制标题
射频自谐振线圈，可在 100 T 级超强脉冲磁场中实现非接触式交流电导通
DOI：
10.1088/1361-6501/aa9a0b
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发表时间：
2018
影响因子：
2.4
通讯作者：
Takeyama S
中科院分区：
文献类型：
--
作者：
Nakamura D;Altarawneh M M;Takeyama S
采用自谐振式高频电路，研制了一种适用于100 T以上脉冲强磁场的电导率非接触测量系统。在电路中的电磁场进行了数值分析的有限元方法，以显示电路的谐振功率谱如何取决于探针线圈上的样品集的电导率。使用高温铜酸盐超导体La 2− x Sr x CuO 4在高达102 T的磁场中以接近800 MHz的高频检查了性能。结果表明，该方法能以较好的信噪比确定上临界场。
A contactless measurement system of electrical conductivity was developed for application under pulsed high magnetic fields over 100 T by using a self-resonant-type, high-frequency circuit. Electromagnetic fields in the circuit were numerically analysed by the finite element method, to show how the resonant power spectra of the circuit depends on the electrical conductivity of a sample set on the probe-coil. The performance was examined using a high-temperature cuprate superconductor, La 2− x Sr x CuO 4, in magnetic fields up to 102 T with a high frequency of close to 800 MHz. As a result, the upper critical field could be determined with a good signal-to-noise ratio.