Helium Composite Regenerator

第二阶段计划的目标是制造和测试 新型低温复合材料，设计用作 运行温度低于10 K的闭式循环制冷机。 述材料是 氦自加载到金属扩展表面中的复合材料 其分散形式适合于热通量的结构 和频率要求。 高效热 从3 - 6 K的容量来自潜热的 亚临界氦的蒸发和冷凝， 10 K以下的热容来自显热容 加压氦气 高的各向异性导热性， 回热器源自金属的几何形状， 成分 高热容和高径向的结合 导热性允许快速的热渗透， 较高再生器效率。 有可能实现 在液氦温度下的显著制冷功率 使用不涉及焦耳-汤姆逊气体的闭合循环制冷机， 节流阶段。

The object of this Phase II program is to fabricate and test novel cryogenic composites designed for use as regenerators in closed-cycle cryocoolers operating below 10 K. The material is a composite of helium self-loaded into a metallic extended surface structure whose dispersion form is suitable for the thermal flux and frequency requirements of regenerators. High effective heat capacity from 3 - 6 K derives from the latent heat of vaporization and condensation of subcritical helium, and high heat capacity below 10 K derives from the sensible heat capacity of pressurized helium. High, anisotropic thermal conductivity in the regenerator derives from the geometric form of the metallic component. The combination of high heat capacity and high radial thermal conductivity allows for rapid thermal penetration and high regenerator effectiveness. The potential exists to achieve significant refrigeration power at liquid helium temperatures with a closed-cycle cryocooler not involving a Joule-Thomson gas- Throttling stage.