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首页> 外文期刊>Nuclear Instruments & Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment >A compact, continuous adiabatic demagnetization refrigerator with high heat sink temperature
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A compact, continuous adiabatic demagnetization refrigerator with high heat sink temperature

机译：紧凑的，连续的绝热去磁冰箱，具有较高的散热器温度

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摘要

In the continuous adiabatic demagnetization refrigerator (ADR), the existence of a constant temperature stage attached to the load breaks the link between the requirements of the load (usually a detector array) and the operation of the ADR. This allows the ADR to be cycled much faster, which yields more than an order of magnitude improvement in cooling power density over single-shot ADRs. Recent effort has focused on developing compact, efficient higher temperature stages. An important part of this work has been the development of passive gas-gap heat switches that transition (from conductive to insulating) at temperatures around 1 and 4 K without the use of an actively heated getter. We have found that by carefully adjusting available surface area and the number of ~3He monolayers, gas-gap switches can be made to operate passively. Passive operation greatly reduces switching time and eliminates an important parasitic heat load. The current four stage ADR provides 6 μW of cooling at 50mK (21 μV at 100mK) and weighs less than 8 kg. It operates from a 4.2 K heat sink, which can be provided by an unpumped He bath or many commercially available mechanical cryocoolers. Reduction in critical current with temperature in our fourth stage NbTi magnet presently limits the maximum temperature of our system to ～ 5 K. We are developing compact, low-current Nb_3Sn magnets that will raise the maximum heat sink temperature to over 10 K.
机译：在连续绝热去磁制冷机（ADR）中，连接到负载的恒温台的存在打破了负载（通常是探测器阵列）的要求与ADR的运行之间的联系。这使ADR的循环速度更快，与单次ADR相​​比，其冷却功率密度提高了多个数量级。最近的努力集中在开发紧凑，高效的高温台上。这项工作的重要部分是开发无源气隙热开关，该开关在不使用主动加热的吸气剂的情况下，可以在大约1和4 K的温度下转变（从导电到绝缘）。我们发现，通过仔细调整可用的表面积和〜3He单层的数量，可以使气隙开关被动运行。被动运行大大减少了切换时间，并消除了重要的寄生热负荷。当前的四级ADR在50mK时提供6μW的冷却（在100mK时为21μV），重量不到8kg。它通过一个4.2 K的散热器运行，该散热器可以由未泵送的He浴或许多市售的机械低温冷却器提供。目前，第四级NbTi磁体的临界电流随温度降低而限制了系统的最高温度为〜5K。我们正在开发紧凑的低电流Nb_3Sn磁体，它将最高散热器温度提高到10 K以上。

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