Standard Dilution Refrigerator Stages

Janis Research Company also offers the following family of standardized dilution refrigerator stages with competitive prices, fast delivery, optimized design, and proven techniques:

Model name
Model JDR-100-DP-Stage
Model JDR-250-DP-Stage
Model JDR-500-DP-Stage
Model JDR-750-DP-Stage

Click on model name above to view its mechanical drawing.  The downloaded file will be in PDF format which is viewable and printable with Acrobat Reader, a free plug-in utility from Adobe.  To download the free acrobat plug-in software click here.

All stages include demountable plates (DP), while a self-contained central core forms the stage main body. With this design, the customer is able to remove the core for any reason without the need to remove the wiring.  This product line offers customers a unique option to build their own special plates for their dil-fridge system and add the Janis core, minimizing cost and time.

All cores consist of a Still chamber, an intermediate cold plate (ICP), two types of heat exchangers and a mixing chamber. Easy-to-remove gold-plated copper plates are attached to the Still and ICP. Standard plates have numerous holes for easy wire installation. However, customized plates are available as an option to meet particular experimental requirements.

Janis' proven technology has satisfied customers calling our dil-fridge stages "reliable" and "leak-free". Janis uses soft-solder-free and indium-free technology. Chambers and heat exchangers are manufactured with CF and VCR couplings, UHV-compatible brazing alloys and austenitic stainless steel. Before arriving at your facility, each core is subjected to multiple thermal cycling between 300 K and 77 K, and rigorous leak testing with a helium leak-detector at 1E-9 scc/s scale.

All stages are contained of the following main parts :

• Demountable (VCR) mixture condensing impedance
• Still chamber with mini-CF flange, super-fluid film suppressor (diaphragm), gold-plated copper bottom flange, and return line heat-exchanger
• Standard demountable (split) gold-plated copper Still plate
• Continuous heat exchanger (Spiral-in-tube)
• Gold-plated Intermediate Cold Plate (ICP) with silver powder heat-exchanger
• Standard demountable (split) gold-plated copper ICP plate
• Silver powder heat exchanger assembly
• Stainless steel Mixing Chamber (MC) with gold-plated copper bottom plate and silver powder heat-exchanger
• Resistive ruthenium oxide temperature sensor (RuO600A) with standard calibration installed on the Still plate
• Resistive ruthenium oxide temperature sensor (RuO600A) with standard calibration installed on the Mixing chamber bottom plate
• 100 Ohm nominal heater on Still plate (wire wound on copper bobbin)
• 100 Ohm nominal wire wound heater on MC plate
• Leak check at 300K and 77K with multiple thermal cycles.  Performance characterization test optional.

Janis can customize the stage to meet your application. Options are available for specialized requirements such as optical density, extra-low magnetic materials (316 series stainless steel, bronze or BeCu hardware), or special geometry for central access to magnets. For UHV compatibility, stages can be cleaned and baked to 90 °C. A Janis engineer can assist in choosing the best options for your application.

Standard JDR-100 Stage	Standard JDR-500 Stage