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HE-3-SSV-PT-2 Cryogen Free Cryostat - Standard Sample Loading, Sample in Vacuum

  • Overview

  • Standard Configuration

  • Specifications

Overview

Click on image to see test results from Cryogen Free He-3 System, ultra low temperature, Janis Research

In the midst of the current He-3 gas shortage crisis, Janis Research Company is very proud to announce the development of the next generation cryogen-free He-3 cryostat system (model HE-3-SSV-PT-2) with substantially enhanced operating efficiency.

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Standard Configuration

In the midst of the current He-3 gas shortage crisis, Janis Research Company is very proud to announce the development of the next generation cryogen-free He-3 cryostat system, with substantially enhanced operating efficiency.

Click button below to enlarge view of mechanical drawing for HE-3-SSV-PT-2 cryogen free cryostat, reference D08-08-13ArevA, ultra low temperature, Janis Research, cryogenicsEnlarge

HE-3-SSV-PT-2 Cryogen Free Cryostat Mechanical Drawing

Janis has improved on its cryogen-free helium-3 cryostat design with its second generation model HE-3-SSV-PT-2 cryostat for cooling samples in vacuum. It 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 Janis new model HE-3-SSV-PT-2 He-3 system offers 100 hours of continuous operation at temperatures 310mK. This represents a 100% increase in operating time, while using the same amount of He-3 gas as the previous generation system.

Alternatively, 50 hours of continuous operation can be achieved while using only 50% as much He-3 compared with previous models. Conserving limited He-3 resources makes good sense, and also significantly reduces the cost of the system.

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.

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-PT-2 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
  • Charcoal sorption pump
  • He-3 condenser
  • He-3 pot
  • He-3 gas
  • Heaters and thermometers
  • Heat switch
  • LabVIEW program for operation
  • Operation test

Options:

  • Resistive and/or superconducting wires
  • Coaxial cables
  • Fiber optics
  • Clear shots
  • Rotating sample holder
  • 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 Janis model HE-3-SSV-PT-2 cryogen-free He-3 cryostat, please click on the highlighted title below. The data includes the temperature of the He-3 pot, the charcoal sorption pump and the He-3 condenser. 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.

  • Model HE-3-SSV-PT-2 performance chart 
  • Model HE-3-SSV-PT-2 cooling power chart

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 then announced the second generation of this system, the Janis model HE-3-SSV-CCR2 cryogen-free He-3 system. And most recently, we are pleased to announce the model HE-3-SSV-PT-2, with a 100% increase in operating time, while using the same amount of He-3 gas as the previous generation system.

HE-3-SSV-PT-2 Performance Specifications:
Amount of He-3 Gas Included: 10 NTP liters
Base Temperature: 310 mK
Operating Temperature Range: 310 mK - 300 K
Holding Time at Base Temperature: 100 hours
Temperature Stability at Base Temperature: ± 250 µK over a period of ten hours with temperature resolution of ± 100 µK
Sample Space without Magnet: 6.0" in diameter minimum and flexible in height
Vibration Level on the He-3 Pot: Less than 1.0 micron when cryocooler with remote motor is used
Cooling Power: 100 µW minimum at 400 mK
Holding Time with 100 µW Heat Load: 6 hours
He-3 Regeneration Time: 3.0 hour typical   

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