Superconducting Quantum Interference Devices for Gravity Wave Detection

wellstand教授将与斯坦福大学、路易斯安那州立大学和马里兰大学的重力波实验研究小组合作，设计、构建和测试灵敏的直流超导量子干涉装置（SQUID）测量系统，该系统专门配置用于超低温韦伯杆重力波天线。在1 kHz的测量频率和50 mK的温度下，SQUID系统将在2年内实现100 h/2的能量灵敏度，在3年内实现10 h/2的能量灵敏度。为了确保系统在实际条件下进行测试，squid的性能将在超导谐振运动传感器以及传统的良好屏蔽低温探头上进行测量。在两个测试周期结束时，将交付一个具有适当灵敏度的工作SQUID测量系统，并将其集成到冷却至50 mK的天线中。通过在超低温天线上使用高性能SQUID测量系统，将大大提高天线对重力辐射的灵敏度，并且将有更大的可能性首次实际探测到重力辐射。

In collaboration with experimental gravity wave research groups at Stanford University, Louisiana State University and the University of Maryland, Prof. Wellstood will design, construct and test sensitive dc Superconducting Quantum Interference Device (SQUID) measuring systems which are specifically configured for use in ultralow temperature Weber-bar gravity wave antennas. At a measuring frequency of 1 kHz and a temperature of 50 mK, the SQUID systems will achieve an energy sensitivity of 100 h/2 within 2 years and 10 h/2 within 3 years. To ensure testing of the systems under realistic conditions, the performance of the SQUIDs will be measured on superconducting resonant motion transducers as well as in conventional well-shielded cryogenic probes. At the end of the two test periods, a working SQUID measuring system with the appropriate sensitivity will be delivered for incorporation into an antenna which is cooled to 50 mK. By using a high performance SQUID measuring system on an ultralow temperature antenna, the sensitivity of the antenna to gravitational radiation will be greatly improved, and there will be a much better possibility of actually detecting gravitational radiation for the first time.