Development of planar thin film HTSC–SQUID gradiometers for different applications

Applied Superconductivity Pub Date : 1998-07-01 DOI:10.1016/S0964-1807(98)00076-3

L Dörrer , S Wunderlich , F Schmidl , H Schneidewind , U Hübner , P Seidel

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引用次数: 6

Abstract

We investigated the main dependencies of the gradient resolution of planar galvanometer superconducting quantum interference device (SQUID) gradiometers made of YBa₂Cu₃O_7-x (YBCO). We focussed especially on the influence of antenna layout and the parameters of the galvanometer SQUID such as effective and parasitic areas on the performance of the gradiometer and the behavior in an unshielded environment. The efficiency (that is, the quotient of effective area to inductance) of different geometries of antennas will be compared. Some aspects of the layout of the galvanometer SQUIDs are discussed in terms of parasitic area and best current resolution. Special problems due to the use of bicrystal Josephson junctions in gradiometers for operation in highly disturbed environment are shown. Step-edge Josephson junctions can offer alternative concepts. Reached gradient sensitivity values in the white noise region are 0.46 pT/(cm/ $H$ z) in the case of bicrystal junctions and 0.69 pT/(cm/ $H$ z) for step-edge junctions.

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用于不同应用的平面薄膜HTSC-SQUID梯度仪的研制

研究了由YBa2Cu3O7-x (YBCO)制成的平面振镜超导量子干涉器件(SQUID)梯度分辨率的主要依赖关系。我们重点研究了天线布局和振镜SQUID的有效和寄生面积等参数对梯度仪性能和无屏蔽环境下性能的影响。将比较不同几何形状天线的效率(即有效面积与电感的比值)。从寄生面积和最佳电流分辨率的角度讨论了振镜squid布局的一些方面。由于使用双晶约瑟夫森结的梯度计在高度干扰的环境中操作的特殊问题显示。阶梯边缘约瑟夫森结可以提供替代的概念。在白噪声区，双晶结的梯度灵敏度值为0.46 pT/(cm/Hz)，阶梯边结的梯度灵敏度值为0.69 pT/(cm/Hz)。

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来源期刊

Applied Superconductivity

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