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NASA’s Cold Atom Lab (CAL): system development and ground test status

机译：NASA的Cold Atom Lab（CAL）：系统开发和地面测试状态

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We report the status of the Cold Atom Lab (CAL) instrument to be operated aboard the International Space Station (ISS). Utilizing a compact atom chip-based system to create ultracold mixtures and degenerate samples of ⁸⁷Rb, ³⁹K, and ⁴¹K, CAL is a multi-user facility developed by NASA’s Jet Propulsion Laboratory to provide the first persistent quantum gas platform in the microgravity conditions of space. Within this unique environment, atom traps can be decompressed to arbitrarily weak confining potentials, producing a new regime of picokelvin temperatures and ultra-low densities. Further, the complete removal of these confining potential allows the free fall evolution of ultracold clouds to be observed on unprecedented timescales compared to earthbound instruments. This unique facility will enable novel ultracold atom research to be remotely performed by an international group of principle investigators with broad applications in fundamental physics and inertial sensing. Here, we describe the development and validation of critical CAL technologies, including demonstration of the first on-chip Bose–Einstein condensation (BEC) of ⁸⁷Rb with microwave-based evaporation and the generation of ultracold dual-species quantum gas mixtures of ³⁹K/⁸⁷Rb and ⁴¹K/⁸⁷Rb in an atom chip trap via sympathetic cooling.

机译：我们报告将在国际空间站（ISS）上运行的冷原子实验室（CAL）仪器的状态。利用紧凑的基于原子芯片的系统创建超冷混合物并降解^{87 Rb，^{39 K和^{41 K的样品，CAL是一种由NASA喷气推进实验室开发的多用户设施，可在空间的微重力条件下提供首个持久性量子气体平台。在这种独特的环境中，可以将原子陷阱解压缩为任意弱的限制电位，从而产生皮可文温和超低密度的新状态。此外，与地球仪器相比，完全消除了这些局限性，可以在前所未有的时间尺度上观察到超冷云的自由下落演变。这个独特的设施将使国际上一组在基础物理学和惯性传感领域具有广泛应用的原理研究人员能够远程进行新颖的超冷原子研究。在这里，我们描述了关键CAL技术的开发和验证，包括对基于微波蒸发的^{87 Rb的首个片上玻色-爱因斯坦凝聚（BEC）的演示以及超冷双晶的产生。原子芯片阱中^{39 K / ^{87 Rb和^{41 K / ^{87 Rb的多种量子气体混合物通过同情降温。}}}}}}}}

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期刊名称 NPJ Microgravity
作者
Ethan R. Elliott; Markus C. Krutzik; Jason R. Williams; Robert J. Thompson; David C. Aveline;
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年(卷),期 2018(4),-1
年度 2018
页码 16
总页数 7
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NASA’s Cold Atom Lab (CAL): system development and ground test status

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