Performance of Pickup Coil Made of Litz Wire and Coupled to HTS SQUID
Performance of Pickup Coil Made of Litz Wire and Coupled to HTS SQUID
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DOI：
10.1016/j.phpro.2012.06.252
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
K. Enpuku;R. Momotomi;T. Mihaya;M. Matsuo;Takashi Yoshida;A. Kandori;K. Tanabe;S. Adachi;A. Tsukamoto
中科院分区：
文献类型：
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作者：
K. Enpuku;R. Momotomi;T. Mihaya;M. Matsuo;Takashi Yoshida;A. Kandori;K. Tanabe;S. Adachi;A. Tsukamoto
研究了铜拾波线圈与高温超导SQUID耦合的性能。线圈由利兹线制成以防止高频下的涡流损耗，并在T = 77 K下冷却以降低热噪声。用里兹线制作了平均直径D = 50 mm、匝数N = 150的超导线圈，并与斜坡边结超导量子干涉器（SQUID）谐振耦合。用超导薄膜制成的59匝输入线圈与超导量子干涉器倒装耦合，互感系数为M=1700 pH，磁场噪声为1fT/Hz ~（1/2），f > 20 kHz。实验结果与设计值吻合较好。
Performance of a copper pickup coil coupled to HTS SQUID was studied. The coil was made of Litz wire to prevent the eddy current loss at high frequencies, and was cooled at T = 77K to reduce the thermal noise. The coil with average diameter D = 50mm and number of turns N = 150 was made with the Litz wire, and was resonantly coupled to HTS SQUID made of ramp-edge junction. The 59-turn input coil was made of superconducting thin film and coupled to the SQUID with flip chip coupling scheme, which gave the mutual inductance of M=1700 pH. The field noise of the magnetometer was measured to be about 1 fT/Hz1/2for f > 20kHz. The experimental results agreed reasonably well with the designed values.