Integration of superconducting magnets with cryogen-free dilution refrigerator systems

Batey, G.; Buehler, M.; Cuthbert, M.N.; Foster, T.J.; Matthews, A. J.; Teleberg, G.; Twin, Andrew

doi:10.1016/j.cryogenics.2009.09.008

Cited by 22 publications

(15 citation statements)

References 18 publications

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“…The approach adopted here is the integration of cryogen-free dilution refrigerators and superconducting magnets [17], with the entire system running from a single pulse tube cooler, with a 'bolt-on' nuclear refrigerator to extend the accessible temperature range to below 1 mK, thus maintaining compatibility with a wide range of experimental applications. Given the extreme precautions taken with nuclear adiabatic demagnetization cryostats to create ultra-low mechanical noise environments in order to minimize heat leaks due to vibration of the nuclear stage, the feasibility of realizing this goal was not apparent; this has been addressed in the work reported here.…”

Section: Introductionmentioning

confidence: 99%

A microkelvin cryogen-free experimental platform with integrated noise thermometry

Batey¹,

Casey²,

Cuthbert³

et al. 2013

New J. Phys.

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We report experimental demonstration of the feasibility of reaching temperatures below 1 mK using cryogen-free technology. Our prototype system comprises an adiabatic nuclear demagnetization stage, based on hyperfineenhanced nuclear magnetic cooling, integrated with a commercial cryogenfree dilution refrigerator and 8 T superconducting magnet. Thermometry was provided by a current-sensing noise thermometer. The minimum temperature achieved at the experimental platform was 600 µK. The platform remained below 1 mK for over 24 h, indicating a total residual heat-leak into the experimental stage of 5 nW. We discuss straightforward improvements to the design of the current prototype that are expected to lead to enhanced performance. This opens the way to widening the accessibility of temperatures in the microkelvin regime, of potential importance in the application of strongly correlated electron states in nanodevices to quantum computing.

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Section: Introductionmentioning

confidence: 99%

A microkelvin cryogen-free experimental platform with integrated noise thermometry

Batey¹,

Casey²,

Cuthbert³

et al. 2013

New J. Phys.

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“…The main part of the dilution refrigerator is given by the TritonUHV, a cryogen free 3 He-4 He dilution refrigerator 13,14 for UHV applications, designed and constructed by Oxford Instruments (OI). [15][16][17][18][19] The Triton is subdivided into five different temperature levels which are thermally decoupled from each other as can be seen in Fig. 2.…”

Section: A Dilution Refrigeratormentioning

confidence: 99%

New experimental perspectives for soft x-ray absorption spectroscopies at ultra-low temperatures below 50 mK and in high magnetic fields up to 7 T

Beeck

Baev

Gieschen

et al. 2016

Review of Scientific Instruments

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A new ultra-low temperature experiment including a superconducting vector magnet has been developed for soft x-ray absorption spectroscopy experiments at third generation synchrotron light sources. The sample is cooled below 50 mK by a cryogen free (3)He-(4)He dilution refrigerator. At the same time, magnetic fields of up to ±7 T in the horizontal direction and ±0.5 T in the vertical direction can be applied by a superconducting vector magnet. The setup allows to study ex situ and in situ prepared samples, offered by an attached UHV preparation chamber with load lock. The transfer of the prepared samples between the preparation section and the dilution refrigerator is carried out under cryogenic temperatures. First commissioning studies have been carried out at the Variable Polarization XUV Beamline P04 at PETRA III and the influence of the incident photon beam to the sample temperature has been studied.

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“…Such a temperature may be routinely provided in the lab by 3 He / 4 He dilution. However, when there is a requirement for the receiving system to be mounted upon a telescope that will follow astronomical targets across the sky this can be problematical for traditional implementations of the dilution refrigerator (DR) because of their complex gas-handling system and limitations in tilt angle (although ± 30°operation is claimed by Batey et al [1] and the Janis ASTRA dilution refrigerator is specified to operate over an asymmetric tilt range). A novel design was developed by Benoit and Pujol [2], that dispensed with the need for a still to draw 3 He out of the mixing chamber, instead employing a "vortex pump" effect.…”

Section: Introductionmentioning

confidence: 99%

A tiltable single-shot miniature dilution refrigerator for astrophysical applications

2013

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We present a 3 He / 4 He dilution refrigerator designed for cooling astronomical mm-wave telescope receivers to around 100 mK. Used in combination with a Gifford-McMahon closed-cycle refrigerator, 4 He and 3 He sorption-pumped refrigerators, our cryogenfree system is capable of achieving 2 µW cooling power at 87 mK. A receiver attached directly to the telescope optics is required to rotate with respect to the downward direction. This scenario, of variable tilt, has proved difficult for typical dilution refrigerators, but our design has a geometry chosen to allow tilt to 45°and beyond.

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Integration of superconducting magnets with cryogen-free dilution refrigerator systems

Cited by 22 publications

References 18 publications

A microkelvin cryogen-free experimental platform with integrated noise thermometry

A microkelvin cryogen-free experimental platform with integrated noise thermometry

New experimental perspectives for soft x-ray absorption spectroscopies at ultra-low temperatures below 50 mK and in high magnetic fields up to 7 T

A tiltable single-shot miniature dilution refrigerator for astrophysical applications

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