The JDry Cryogen-Free Dilution Refrigerators


The JDry cryogen-free dilution refrigerators from JanisULT enable easy and cost-effective cooling of devices to less than 10 mK temperatures.

The JDry models have been improved for quantum computing applications and can accommodate up to 270 semirigid cables. General-purpose configurations and astronomy/detector cooling are also provided.

The JanisULT JDry cryogen-free dilution refrigerator range includes two regular models and both versions enable easy push-button cooling to less than 10 mK through a solo pulse tube cryocooler.

The JDry-250-QT features a cold-plate with a diameter of 305 mm (12″) and provides more than 250 µW at a cooling power of 100 mK. The JDry-500-QPro model is larger, fitted with a cold-plate of 508-mm (20″) diameter, and provides a cooling power of more than 450 µW.

The NI LabVIEW™-based “JACoB” gas-handling controller is a robust and fully automated device that allows users to run the system without the system controlling their life.

Image Credit: JanisULT

Proven Technology

  • Light-tight design
    • Mixing chamber shield equipped with an internal carbon-black coating
    • Completely welded shields with light-tight plates and interfaces at 3 K, mixing chamber, and a still, cold-plate
  • Developed in association with Google
    • The only dilution fridge that enables quantum supremacy

Made in the United States

  • As founder members of the Quantum Economic Development Consortium, JanisULT works collaboratively to ensure a powerful supply chain and industry of quantum-enabling technologies in the United States
  • JanisULT is the only commercial producer of dilution refrigerators in the United States
  • JanisULT supports the U.S. quantum sector

Low Running Costs, Less Vibration, Less Noise, and Reduced Maintenance

  • The Quantum DRs from JanisULT include a 10K plate that uses the available cooling power between the pair of PTR stages—this decreases the heat-load onto the 3K stage of the PTR with the following advantages:
    • Allows the use of a lower power PTR versus competitors, thus decreasing maintenance cost and vibration levels
    • Compressor is not required to condense the mixture; also, fewer pumps are needed to maintain, which translates to lower vibrations, less noise, and a lower risk of failure
    • Bigger systems work with only one PTR in contrast to other competitor systems that use two PTRs, resulting in lower vibration and noise, lower energy consumption, and lower maintenance costs

Large Convenient Experimental Access

  • Huge ISO100 line-of-sight ports are conveniently mounted on the edge of the cold plates
    • Allows easy access to cold electronics and experimental services

Designed for Reliability and Serviceability

Highest Quality Dilution Refrigerator Core

  • JanisULT has more than two decades of experience in designing and producing dilution fridges
    • JanisULT uses the same technology for UHV-compatible dilution refrigerators, ensuring cleanliness and quality
    • Only TIG welding and silver brazing have been used to design the mixing chamber, heat exchangers, and all parts of the refrigerator “core.” Soft solders are not utilized in the mK area of the system, and this prevents the standard source of leakage in dilution refrigerators
  • Primary flow impedance and JT stage can be demounted
  • DR core has a modular design that ensures simple maintenance and easy removal and exchange of the unit if required

Best-in-Class Thermometry

  • Thermometry on each plate
  • CMN calibrated thermometry—resistant to RF heating as low as 5 mK
    • There is no need to depend on resistance thermometry, which is known to be inconsistent below 50 mK
  • Lakeshore LS372 AC resistance bridge equipped with a 16-channel scanner
    • Utilizes only the proven standard and not a low-cost, “homemade” temperature controller

Convenient Automated Operation

JACoB Automated Gas Handling System for Dilution Refrigerators

  • Completely automated operation through a touch-panel controller
    • Can be manually operated if required, or in a fully automatic mode through pre-configured scripts
  • API programming language
    • Enables user-designed or third-party experimental software to communicate with the LabVIEW™ system control software.
  • The graphical user interface (GUI) offers intuitive data regarding the condition of all pumps, gauges, and valves
  • All major operating features can be remotely accessed through an Ethernet interface
  • The Linux-based controller runs the LabVIEW™ software and complies with industrial-strength National Instruments, ensuring consistent system operation, such as sophisticated power management features

Excellent Customer Service

  • Three-year warranty
  • Direct access to scientists and engineers who developed the users’ system

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