Search for Gravitational Radiation Using Ultralow Temperature Techniques

引力辐射的共振质量探测器 已经开发出可以在液氦中可靠运行的 灵敏度h ~ 10-18。 在这个 我们不希望探测到引力的灵敏度水平 除了最罕见的天体物理学 事件 然而，建造超低空飞行器的技术 温度（40 mK）探测器，灵敏度至少为h ~ 10-19，可能是10-20，足以探测引力 来自可能发生的天体物理事件的辐射 在我们的银河系或其附近，是在手中。 的 斯坦福大学的研究计划有以下关键要素： a）完成超低温（40 mK）探测器 目前正在建设中， B）该检测器与其它检测器同时操作， 引力波和中微子爆发探测器， c）运行现有的4K探测器，直至可靠 实现了超低温探测器的工作， d）继续研究，以提高 可调电感传感器， e）升级现有的4K探测器， f）研究先进探测器的发展，包括 低频隔振研究 替代天线材料。 这个小组率先建造了低温 重力波接收器，并操作三个最 最敏感的探测器 进一步改善 他们的接收者不仅将在搜索中发挥领导作用， 对于引力波，它将提供重要的 在精密测量和振动方面的技术附带利益 隔离，这将有助于更广泛的社区。

Resonant-mass detectors of gravitational radiation have been developed that can be reliably operated at liquid helium temperature (4.2K) with sensitivities h ~ 10-18. At this sensitivity level we do not expect to detect gravitational wave signals from anything but the rarest astrophysical events. However, the technology to build an ultralow temperature (40mK) detector with sensitivity of at least h ~ 10-19 and likely 10-20, sufficient to detect gravitational radiation from plausible astrophysical events that could occur in our galaxy or its immediate vicinity, is in hand. The Stanford research program has the following key elements: a) completion of an ultralow temperature (40 mK) detector now under construction, b) operation of this detector in coincidence with other gravitational wave and neutrino burst detectors, c) operation of the existing 4 K detector until reliable operation of ultralow temperature detector is achieved, d) continuing research to advance the state-of-the-art in superconductive modulated-inductance transducers, e) upgrade of the existing 4K detector, f) research on advanced detector development including low-frequency vibration isolation and investigation of alternative antenna material. This group has pioneered the construction of cryogenic gravity wave receivers, and operates one of the three most sensitive detectors in the world. Further improvement of their receiver will not only provide leadership in the search for gravitational waves, it will provide important technological spin-off in precision measurements and vibration isolation which will be of use to a wider community.