Cryogen-free Dilution Refrigerator

JDry Series

The Janis JDry-100 (click image for larger view) provides convenient and affordable cooling of samples and devices to temperatures below 20 mK, with cooling power greater than 100 µW at 100 mK.  The system uses a pulse-tube mechanical cryocooler, eliminating the need for liquid cryogens.  Based on the modular Janis JDR-100 technology, the JDry-100 brings a new level of simplicity and reliability to research applications requiring mK temperatures.

Features

• Convenient table-top size with fully integrated vacuum enclosure.
• Pulse-tube precooling to 4 K; no cryogens required.
• Joule-Thomson mixture condensing stage, including ³He-⁴He mixture.
• RuO₂ thermometers installed on all stages, with wiring to LCSI 370S resistance bridge including demo LabVIEW control program.
• 32 manganin wires in twisted pairs, installed and thermally anchored for connection to experimental applications.
• Manual gas handling system with analog pressure gauges, digital vacuum and flow meters (including RS-232C).
• Pumping station with hermetically sealed mechanical pump, mist filter, interlock, pumping lines, and butterfly style Still isolation valve.
• Pump-compressor.
• Optimized ³He-⁴He mixture.

Specifications

• Cooling power: >100µW @ 100 mK
• Base temperature: <20 mK at mixing chamber plate
• Dimensions: ~15" diameter by ~36" height
• 0.5 W @ 4.2 K pulse-tube, with water-cooled compressor and flexlines

Options

• Automated gas handling system: PLC/PAC controlled with miniature solenoid valves, all digital gauges and pump motor starter.  Provides full system control from integrated 12" touch-screen panel, or via RS-232C/Ethernet computer interface in LabVIEW environment.
• Larger 1 W @ 4.2 K pulse tube refrigerator, air-cooled compressor, longer flexible gas lines for locating the compressor remotely.
• Alternative mixture circulation systems.
• Low frequency, high frequency wiring (fully wired with twisted pairs, micro-coax or semi-rigid).
• Self-calibrating thermometry system with CMN paramagnetic thermometer (5 - 1000 mK), superconducting fixed point device (FPD), and LCR meter for readout.
• Additional thermometers including RuO₂, Matsushita or Speer resistive devices.
• Integrated superconducting solenoid, conductively cooled.
• Optical access.
• External LN₂ cooled trap.
• Still isolation gate valve, longer interconnecting lines.

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Links to our complete line of dilution refrigerator products can be found below.