Next Generation HTS SQUID Gradiometer Systems and their Portable Operation in Unshielded Environments

该计划旨在开发完全便携和更灵敏的高温超导SQUID系统，该系统将在非屏蔽环境中运行，并极大地提高其在生物磁性测量(特别是成人和胎儿磁心电信号)无损评估和地球物理学中的使用潜力。该计划有三个方面：1.通过(A)开发一种改进的SQUID版本-超导Qua干涉滤光片或SQIF(B)提高SQUID与其场敏线圈之间的耦合效率，包括开发基于NdBaCuO的多层结构和(C)开发技术在更大的衬底上生长HTS薄膜以制作更大的梯度。用于非屏蔽测量的高平衡二阶梯度仪的研制。它们将由两个一阶梯度计形成电子，再加上三轴参考磁力仪的额外噪声抑制和基于计算机的S在时间或频率域的处理。通过设计、分析和测试基于固体氮气冷却器的不使用低温液体制冷器的原型系统，改进了便携性。

This programme aims to develop fully-portable and more sensitive HTS SQUID systems that will operate in unshielded environr and to greatly increase their potential for use in biomagnetic measurements (in particular adult and foetal magnetocardiogra non-destructive evaluation and geophysics.There are three strands to the programme:1. Improvements to the intrinsic sensitivity by (a) developing a modified version of the SQUID - the Superconducting Qua Interference Filter or SQIF (b) enhancing the coupling efficiency between the SQUID and its field-sensing coils, includin development of multi-layer structures based on NdBaCuO and (c) developing techniques to grow HTS films on larger substrate to make larger gradiometers.2. The development of high-balanced second-order gradiometers for unshielded measurements. These will be formed electron from two first-order gradiometers, with additional noise rejection by 3-axis reference magnetometers and computer-based s processing in the time or frequency domains.3. Improvements to portability through the design, analysis and testing of a prototype system that uses no cryogenic liquid cryocooler, based on a solid nitrogen cooler.