Sub-Kelvin Cryogenic Modules
Our partner's commitment lies in the development of compact, energy-efficient, and user-friendly technologies. We are dedicated to ongoing innovation and expanding our product portfolio to provide cost-effective modular solutions for achieving sub-Kelvin temperatures.
Cool to below 1 KelviN
SINGLE-STAGE SUB-KELVIN 4He SORPTION COOLER
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Cost-effective, user-friendly, dependable, and highly efficient – our 1K sorption cooler modules seamlessly interface with either a mechanical (GM/PT) cryocooler or the 4K plate of a 'wet' dewar. We offer a range of interfacing options tailored to accommodate cold tables housing the end-user application.
These sorption coolers have gained popularity in diverse applications, including quantum computing, superconducting nanowire single-photon detectors (SNSPDs), superconducting electronics, and semiconductor wafer testing. When it comes to achieving temperatures below 1K, you won't find a more straightforward and effective solution. Please feel free to contact us to discuss your specific requirements. |
CONTINUOUS 4He CRYOCOOLER
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This compact 1K continuous cooler has been meticulously engineered for seamless integration with a low-power GM cryocooler. Initial cooldown times may be relatively extended, approximately around 24 hours; however, these times can be mitigated by incorporating an optional heat switch or employing a more robust 4K cryocooler.
The system incorporates two helium 4 modules, each functioning akin to a single-shot sorption cooler. These modules operate in alternating cycles to ensure continuous cooling of the central 1K-head, effectively affording unlimited runtime when managed through software control. It is noteworthy that minor temperature fluctuations may occur at the transition point between the two modules. Nonetheless, numerous optimisation strategies are at the disposal of end users to fine-tune performance according to their specific application requirements. As a general guideline, it's important to recognize that there exists a trade-off between achieving lower temperatures and maintaining temperature stability. In essence, reducing temperature fluctuations may entail accepting a slightly elevated average temperature. |
Cool to below 300 mKelvin
TWO-STAGE SUB-KELVIN 3He SORPTION COOLER
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Gram per gram, Helium 3 is the world’s most expensive substance. CRC’s gas-light sub-Kelvin sorption coolers have been designed to make the best possible use of this scarce resource.
By buffering the ultra-cold stage with either one or two intermediate stages, we reduce the heat load on the ultra-cold head and hence lower the running temperature and lengthen the run time. As our coolers are sealed systems, no helium gas is consumed during operation and our units never need to be recharged or re-filled. Our latest design, the 300mK continuous cooler, even offers unlimited run time. |
Single-shot add-on Sorption Cooler
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This single-shot sorption cooler introduces an additional ultracold stage, augmenting the capabilities of the existing two-stage sub-kelvin 3He sorption cooler.
This supplementary stage imparts load buffering functionality, enabling the system to achieve an impressive base temperature below 250mK while possessing substantial heat buffering capacity at various temperature intervals below 4K. Notably, it is also conceivable to further enhance cooling power at ultra-low temperatures by incorporating a second ultracold stage. |
Compact Continuous sorption Cooler
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This is a compact continuous ~300mK sorption cooler that is designed to interface to a low-power GM cryocooler.Packed with two helium 3 and two helium 4 modules, each 3-4 module set works like a conventional two-stage single-shot sorption cooler. The two ‘sides’ of the two-stage single-shot sorption cooler are cycled alternately to keep the central split condenser permanently cold. The split condenser is the cold head of the compact continuous sorption cooler.
The compact continuous sorption cooler is run under software control to operate the switching sequences required to keep the unit running indefinitely. The split condenser shows small temperature fluctuations when the cycle hands over from one side to the other. There is considerable scope for the end-user to smooth out these fluctuations; the best optimisation scheme will depend on the cryogenic environment and on the heat load this imposes on the cooler. Residual fluctuations can be smoothed out using PID feedback to a load resistor mounted on the split condenser, though this will increase the average temperature of the split condenser. |
Cool to below 100 mKelvin
Continuous Miniature Dilution Cooler
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Achieve ultra-low temperatures through the utilization of latent heat of enthalpy generated during the dissolution of liquid Helium 3 into liquid Helium 4. Our Continuous Miniature Dilution (CMD) coolers, once again, offer compact and self-contained solutions that eliminate the need for external gas supplies and the costly refilling of Helium 3. The CMD system integrates our 300mK continuous cooler, serving to pre-cool and buffer the dilution module.
If you are keen to explore the diverse potential applications of this unique cooling technology, please do not hesitate to contact us. We welcome the opportunity to engage with you, discuss your specific requirements, and explore how we can assist in meeting your needs. |
Heat Switches
Active Heat Switches
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In an active heat switch configuration, a compact external gas absorber pod is intricately linked to the base of the switch via a gas conduit. Controlled by the user, gas is released into the switch through controlled electrical heating of the pod. The thermal conductance in both the ON and OFF states is contingent upon the material properties of the gas, the heat switch shell, and the temperatures at the 'hot' and 'cold' termini.
In an ideal scenario, a heat switch would exhibit exceptionally high on-state conductance while simultaneously maintaining an extremely low off-state conductance. However, practical implementation presents significant challenges in manufacturing gas-gap heat switches that fulfil both of these criteria. Additionally, spatial constraints further compound the design considerations. To find out whether we can provide a heat switch for your particular requirements, contact us to let us know more about your intended application." |
Passive Heat Switches
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A passive switch incorporates an internal absorber and operates autonomously. It activates and maintains the fully ON state as long as the temperature at the hot end exceeds approximately 15-20K. During the ON state, it exhibits a significant thermal conductivity, typically around 100mW/K at 4K.
As the hot end temperature decreases below approximately 10K, the switch initiates the process of turning OFF, culminating in full deactivation when the hot end temperature reaches approximately 4K. In the OFF state, the switch exhibits residual thermal conductance, the magnitude of which is determined by the material properties and dimensions of the shell. |
Related Instruments
Cryogenics
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Probe Station
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XYZ Microscope Stage
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Cryogenic Probe Station
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*Pictures shown above are for reference only. Actual product may differ slightly.
**Some products may not be available in all countries. Please contact us for further information and clarification. |
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