• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>International Cryogenic Materials Conference >Progress on a 4 K to 10 K Continuously Operating Adiabatic Demagnetization Refrigerator
【24h】

Progress on a 4 K to 10 K Continuously Operating Adiabatic Demagnetization Refrigerator

机译：4 k至10k的进展连续运行绝热退磁冰箱

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

An adiabatic demagnetization refrigerator (ADR) is under development for use in cooling relatively large loads (10–100 mW) at 4 K and rejecting that heat to a cryocooler operating at 10 K. ADRs can operate in this temperature range with an efficiency of 75% of Carnot, saving as much as 2/3 of the required overall input power. In addition this ADR can provide cooling down to 0.4 K. The ADR magnet consists of 8 short coils wired in series and arranged in a toroid to provide self-shielding of its magnetic field. Eliminating passive or active shields saves 30% of the mass of the system. The average field is 3 Tesla using 5 amps. In the first model the coils are wound with ordinary NbTi superconducting wire and operated at 4 K. A second version will then use fine Nb3Sn wire to provide complete 10 K operation. As a refrigerant for this temperature range we are using readily available gadolinium gallium garnet (GGG) crystals, which provide suitable performance. In the future we will switch to either GdLiF4 or GdF3, which have 13% or 30%, respectively, more cooling power per volume than GGG. We use gas gap heat switches to alternately connect the toroid to the cold load and the warm heat sink. A small continuous stage maintains the cold end at 4 K while the main toroid is recycled. Data on toroid , magnet performance with respect to central field vs. current and fringing field vs. current are given. Data on the transient heating due to hysteresis losses within the superconductor are also presented.
机译：在开发中，绝热退磁冰箱（ADR）在4 k下冷却相对大的载荷（10-100mW），并拒绝在10K上运行的低温冷却器的热量可以在该温度范围内运行，效率为75百分之一的百分比，节省多达2/3所需的整体输入功率。此外，该ADR可以提供冷却至0.4K .ADR磁体由串联连接的8个短圈，并布置在环形中以提供其磁场的自屏蔽。消除被动或主动屏蔽可节省30％的系统质量。平均场为3个Tesla，使用5安培。在第一种模型中，线圈用普通的NBTI超导线缠绕并以4 K操作。然后，第二个版本将使用精细的NB3SN线来提供完整的10 K操作。作为该温度范围的制冷剂，我们使用易于获得的钆镓石榴石（GGG）晶体，其提供合适的性能。在未来，我们将切换到GDLIF4或GDF3，分别具有13％或30％，每个体积的冷却功率比GGG更多。我们使用气隙热开关交替地将环形连接到冷负载和温热的散热器。小连续阶段在主要环形再循环时将冷端保持在4 k处。给出了环形数据的数据，给出了中心场与电流和流动场与电流的磁体性能。还介绍了超导体内引起的瞬态加热的数据。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号