Development of High-Pressure Facility at the University of Washington

EAR-0214547 Kress1997年8月，地质系从斯坦福大学购买了一些有价值的实验设备。设备包括：1)大容量1.4 GPA哈伍德双级气体压缩机和较小的第三级游标泵。2)两个内径5厘米的内部加热压力容器和一个较小的内径4.1厘米的容器，设计压力均为1 Gpa。3)大量的阀门、压力表和管材。在华盛顿大学已经提供的资金的基础上，调查人员将把这种设备组装成一个工作状态最先进的高压高温实验设备。该设施将用于在环境压力到1 Gpa(10,000巴)压力和温度高达1,500摄氏度的条件下，在受控或监测的氢、氧和硫逸度的情况下对地质问题进行实验勘探。任何其他常用的实验方法都不能准确地达到这个PT范围。该设施将能够探测地球大部分大陆地壳和上大洋地幔的条件。这一压力和温度范围还包括火星雪戈提岩的可能来源区域(Ghosal等人，1998年)。这种实验仪器的体积很大，能够在高压环境中集成大量的电气馈线，这使得实验设计具有极大的灵活性。此外，因为压力介质是气体，所以可以准确地测量压力，并且可以确保样品所经历的压力是完全各向同性的。建议只能在这种设备上进行超声波实验。*

EAR-0214547KressIn August, 1997, the Department of Geology acquired a number of valuable pieces of experimental equipment from Stanford University. Equipment includes: 1) A high-capacity 1.4 GPa Harwood two-stage gas compressor and smaller third stage "vernier" pump. 2) Two 5 cm bore internally heated pressure vessels and a smaller 4.1 cm bore vessel, all with a design pressure of 1 GPa. 3) A large collection of valves gauges and tubing. Building on funds already provided by the University of Washington, the investigators will assemble this equipment into a working state-of the-art high-pressure high-temperature experimental facility. This facility will be used for experimental exploration of geological problems under conditions ranging from ambient to 1 GPa (10,000 bars) pressure and temperatures up to 1,500 degrees centigrade under controlled or monitored fugacities of hydrogen, oxygen and sulfur. This PT range is not accurately accessible by any other commonly used experimental method. This facility will be capable of exploring conditions found over most of Earth's continental crust and down to upper oceanic mantle. This pressure and temperature range also includes the probable source region for Martian shergottites (Ghosal et al., 1998). The large volume of this experimental apparatus and the ability to incorporate numerous electrical feedthroughs into the high pressure environment allows tremendous flexibility in experimental design. Furthermore, because the pressure medium is a gas, pressures can be measured accurately, and one can be assured that the pressure experienced by the sample is entirely isotropic. Ultrasonic experiments are proposed that can only be done in this type of device.***