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

该方案的目的是开发可在无屏蔽环境下操作的完全便携式和更敏感的高温超导SQUID系统，并大大增加其在生物磁测量（特别是成人和胎儿心磁非破坏性评价和地球物理）方面的潜力。该计划有三个部分：1.；通过(a)开发一种改进的SQUID -超导Qua干涉滤波器或SQIF (b)提高SQUID与其场感线圈之间的耦合效率，包括开发基于NdBaCuO的多层结构和(c)开发在更大的衬底上生长HTS薄膜的技术来制造更大的梯度仪。用于非屏蔽测量的高平衡二阶梯度仪的研制。这些电子将由两个一阶梯度仪形成，外加3轴参考磁强计的噪声抑制和时域或频域的计算机处理。在固体氮冷却器的基础上，通过设计、分析和测试不使用低温液体制冷机的原型系统，提高了可移植性。

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.