Easy access to sample region

The large and open structure of the Triton platform makes it easy to install additional equipment on the experimental plates.

The mixing chamber plate can support an experimental mass of up 10 kg in its standard configuration. It can also be reinforced to suit even heavier experiments should it be required. The 4 K plate (PT2) can support an additional 60 kg of equipment.

Robust and proven dilution unit technology

The solid track record of the Oxford Instruments dilution unit is a result of several decades of work into perfecting the art of welding, brazing and soldering components for maximum reliability and leak-tightness.

This critical component is now used in more than 700 wet and dry dilution refrigerators worldwide – a larger installed base than all other vendors combined.

Low vibrations

The vibration amplitude has been measured on all experimental plates to 100 nm or less across the frequency spectra from 1 Hz to 1 kHz. This is achieved with two important features: the use of highly flexible copper braids, which decouple the pulse-tube heads from the experimental plates.









Temperature stability

Temperature control is critical for careful sample characterisation of any new material or device. The inherent base temperature stability of the system without an active temperature control feedback loop can be seen in this graph. The temperature measured was 8.3 ± 0.2 mK. In separate experiments, when over biasing the control sensor, the closed loop control of the system can be improved.

In the temperature range 20 – 300 mK, control better than 10 μK has been achieved. Also shown here is the measured mixing chamber temperature, whilst controlling the temperature at 30 K and simultaneously ramping an integrated magnet from zero field to 12 T and back to zero at 0.3 T/min. The standard deviation of the temperature measurements was 3.5 mK and the maximum deviations were approximately ± 7 mK.

Demountable impedance

Despite highly efficient cold traps, small amounts of contamination may accumulate after a few years of operation. The Triton design with easily accessible and demountable impedance on a standard VCR gasket fitting, makes it easy to change this component ,should it be necessary.

Cold traps

Internal charcoal traps operating at 60 K, is capable of adsorbing more than 1 L of air contamination.

The system can easily operate for more than 6 months without having to warm it up.

Long hold time of the LN2 dewar for the external cold trap, requiring only one top-up per week. Dewar with even longer hold time is available on request.


Professionally soldered sensors (4-wire read out) are installed on all five experimental plates with demountable connectors for ease of service. Sensors and heaters are operated using a Lakeshore 370AC bridge with a 16 channel scanner.

The mixing chamber RO2 sensor is cross-calibrated in the factory against a primary Co60 nuclear orientation (NO) crystal. Because resistance thermometry is sensitive to changing RF environment, we offer the calibration to be repeated during installation to confirm its accuracy.

Integrated gas handling system

The welded assembly with high performance, pneumatically controlled, bellow-sealed valves offer minimum risk of through leaks. Integrated pressure-relief valves protect against pressure build-up due to a power cut or cryogenic blockage. Switches allow for manual control of all pneumatic valves, without having to rely on the software (requires 5 bar compressed air supply).

Oil and dust free pumping circuit

The Pfeiffer HiPace turbo pump has magnetic bearings for minimum wear and an expected life time approaching 100,000 hours and is UL certified.

The Oxford Instruments model is optimised for helium gas to ensure the lowest possible still temperature.




Adixen dry multi-stage roots pump from Pfeiffer, is renowned for its high reliability in the semiconductor industry and is UL certified. Roots pump benefits from a higher pumping speed than many alternative pumps, which means less strain on the turbo pump.





Double-diaphragm compressor from KNF, a high specification version, developed specifically for Oxford Instruments. It is UL certified and capable of operating at very high outlet pressures of 4 bar, which provides extra safety in the event of a partial restriction developing in the cold section of the condensing line. Its unique double-diaphragm design offers an extra layer of protection against loss of mixture (absent in any other pumping technology). It is also a cleaner technology, for example, compared to scroll pumps, which generate dust from the tip seal.



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