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arXiv 1809.07162physics.ins-detcond-mat.dis-nn
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无制冷剂稀释制冷机中硅振荡器的热耦合

Thermal coupling of silicon oscillators in cryogen-free dilution refrigerators

David Schmoranzer, Sumit Kumar, Annina Luck, Eddy Collin, Andrew Fefferman, Xiao Liu, Thomas Metcalf, Glenn Jernigan

摘要:

硅双桨振荡器(DPO)已经成功地用于测量低至10 mK的非晶膜的弹性特性(参见例如\cite{Fefferman16,Liu14})。到目前为止,我们的团队一直使用湿稀释冰箱进行最低温度测量。我们目前的测量进行了Bluefors无低温稀释冰箱,证明了极端的敏感性的DPO的热耦合到它的环境。这些测量结果表明,有必要在混合室(MXC)温度下将DPO封闭在屏蔽中。即使没有到达DPO的视线路径,护盾上的任何间隙都会限制其有效性。在DPO周围没有低温密封屏蔽的情况下,关闭脉冲管同时保持MXC和静止温度会导致DPO加热。这表明,由于脉冲管振动导致的样品的任何加热是不太重要的影响。

英文摘要:

Silicon double paddle osillators (DPO) have been successfully used for measuring the elastic properties of amorphous films down to 10 mK (see for example \cite{Fefferman16,Liu14}). Until now, our group has used a wet dilution refrigerator for the lowest temperature measurements. We present measurements carried out on a Bluefors cryogen-free dilution refrigerator that demonstrate an extreme sensitivity of the thermal coupling of the DPO to its environment. These measurements show that it is necessary to enclose the DPO in a shield at the mixing chamber (MXC) temperature. Any gaps in the shield limit its effectiveness, even if there is no line-of-sight path to the DPO. In the absence of a cryogenic hermetic shield surrounding the DPO, turning off the pulse tube while maintaining the MXC and still temperatures leads to heating of the DPO. This demonstrates that any heating of the sample due to pulse tube vibrations is a less important effect.

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