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HE-3-SSV-CCR2 Cryogen Free Cryostat - Standard Sample Loading, Sample in Vacuum

Overview

Click on button below to enlarge view of HE-3-SSV-CCR cryogen free helium-3 cryostat from Janis Research, cryogenic equipment

Janis has improved on its cryogen-free helium-3 cryostat design with its second generation model HE-3-SSV-CCR2 cryostat for cooling samples in vacuum.

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Standard Configuration

Janis has improved on its cryogen-free helium-3 cryostat design with its second generation model HE-3-SSV-CCR2 cryostat for cooling samples in vacuum. It uses a pulse tube cooler with no cryogens, to achieve a minimum temperature of approximately 300 mK. The He-3 gas is permanently stored in the cryostat and is condensed after initial system cool down. The cryostat's single stage design permits He-3 condensation without requiring a 1 K pot and associated pump. An internal charcoal sorption pump is used to reduce the pressure at the liquid He-3 to cool it down to its terminal temperature. 

Click on button below to enlarge view of mechanical drawing of HE-3-SSV-CCR2 cryogen free helium-3 cryostat from Janis ResearchEnlarge

HE-3-SSV-CCR2 Cryogen Free Cryostat Mechanical Drawing

The system utilizes the additional cooling power from the regenerator to pre-cool the He-3 gas before it is liquefied. The condensing efficiency is substantially enhanced with this novel design, resulting in a longer holding time.

The system includes highly conductive flexible thermal links made from multiple strands of OFHC copper fine wires, to connect the two stages of the cooler to two OFHC copper flanges. These are in turn used to cool to two radiation shields and bi-polar heat switch that control the He-3 condensation, cool down and temperature control. This design intercepts the vibrations of the cryo-cooler and significantly reduces the vibrations that may be transmitted to the He-3 stage and any detectors or samples attached to that stage. 

A hermetically sealed "IVC can" is installed below the second stage cold plate so that the HE-3 insert and the sample can be cooled down with exchange gas, which reduces the required pre-cool duration.

The system is supplied with a complete set of thermometers and heaters to monitor and control the temperature of the various stages of the cryostat. It also includes all the necessary valves and pressure gauges for safe reliable system operation.

The model HE-3-SSV-CCR2 system includes the following components:

  • Cryostat with vacuum jacket and cold stages
  • Pulse tube cryo-cooler (cold head and compressor, high pressure hoses, etc.) with distributed cooling stage
  • Hermetic IVC
  • Charcoal sorption pump
  • He-3 condenser
  • He-3 pot
  • He-3 gas
  • Heaters and thermometers
  • Heat switch
  • LabVIEW program
  • Operation test

Options:

  • Resistive and/or superconducting wires
  • Coaxial cables
  • Fiber optics
  • Clear shots
  • Rotating sample holder
  • High efficiency helium dewar
  • Low eddy current cold finger
  • Automatic temperature controller
  • Turbo pumping station 

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Specifications

To see an actual system cool down chart of the first generation Janis model HE-3-SSV-CCR cryogen-free He-3 cryostat, please click on the highlighted title below. The data includes the temperature of the first stage cold plate, the charcoal pump, the He-3 condenser and the He-3 stage. 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.

In 2002, Janis delivered the first model HE-3-SSV-CCR cryogen-free He-3 system (which reached a base temperature of ~300mK with measured holding time of 50 hours). Since then, there has been a steady increase in interest in cryogen-free low temperature systems. We are now very pleased to announce the second generation of this system, the Janis model HE-3-SSV-CCR2 cryogen-free He-3 system. This system incorporates the following significant new features:

  • Replaces the GM cryocooler with a pulse tube cryocooler to further minimize the vibration level. (Although the vibration from the GM cryocooler does not impact the performance of the first generation Janis cryogen-free He-3 system, such vibrations can sometimes be significant for the user's experiments.)
  • Utilizes the additional cooling power from the regenerator to pre-cool the He-3 gas before it is liquefied. The condensing efficiency is substantially enhanced with this novel design, resulting in a longer holding time for the same amount of He-3 gas (see pre-print; <<Extracting Cooling From Pulse Tube and Regenerator in a 4K Pulse Tube Cryocooler>> by Chao Wang at Cryomech, Inc., Syracuse, NY 13211).
  • A hermetically sealed "IVC can" is installed below the second stage cold plate so that the HE-3 insert and the sample can be cooled down with exchange gas, which reduces the required pre-cool duration.
  • Replaces the three complex mechanical heat switches with one bi-polar, cost effective, and user-friendly heat switch operated with a simple manipulator (with motorized option).
  • LabVIEW compatible program for system operation is included.
  • The selling price of the new system is substantially reduced.
Performance Specification:
Base Temperature: 300 mK
Holding Time at Base Temperature: 50 hours
Operating Temperature Range: 0.3 K - 80 K (300 K optional)
Sample Space: As required
Cooling Power: 100 microwatt minimum at 350 mK
Holding Time with 100 microwatt Heat Load: 6 hours minimum
He-3 Regeneration Time: 1.0 hour typical

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