HE-3-SVSD Helium-3 Cryostat

"Wet" System - Standard Sample Loading - Sample in Vacuum
For use in an helium-4 storage dewar

The model HE-3-SVSD insert is designed to fit an helium-4 storage dewar with a 2.0" - 3.0" neck diameter. A special brass taper seal is employed at the IVC in order to maximize the sample space. The sample is attached at the bottom of the He-3 pot inside the IVC can for cooling. The system design minimizes the intrinsic heat leak to the He-3 pot and optimizes system performance. It also makes use of all the liquid helium available in the storage dewar with built-in "sippers" that reach the bottom of the dewar.

With JanisULT's superior design, the He-3 insert can be operated with the 1 K pot pump turned off after it reached the base temperature. In this case the system will be extremely quiet, which is highly desirable for many applications. This unique feature also reduces the liquid helium consumption and makes the operation more cost effective.

This He-3 insert includes the following components:

  • Sliding seal
  • Charcoal sorption pump with heater and thermometer
  • 1 K pot with thermometer
  • He-3 pot with heater and thermometer
  • Permanently stored He-3 gas
  • IVC can
  • Operation test


  • Resistive and/or superconducting wires
  • Coaxial cables
  • Fiber optics
  • Clear shots to IVC
  • Computer controller motorized 1 K pot cryogenic needle valve
  • Rotating sample holder
  • High efficiency helium storage dewar
  • Automatic temperature controller
  • Superconducting magnet
  • Magnet support with high current leads
  • Magnet power supply
  • IVC tail for superconducting magnet
  • Low eddy current cold finger
  • Liquid helium transfer line
  • 1 K pot pumping station
  • Turbo pumping station

Performance Specification

Pumping the 1 K pot
Base temperature: 300 mK
Hold time at base temperature: 80 hours

Stop pumping the 1 K pot after the base temperature is reached
Base temperature: 320 mK
Hold time at base temperature: 24 hours

Operation temperature range: 0.3 K - 80 K (300 K optional)
Sample space: 1.5" - 2.5" depending on the dewar neck dimensions

Drawing of He-3-SVSD insert. The insert is designed to fit into a helium-4 storage dewar, Janis Research
Drawing of Model HE-3-SVSD Insert
HE-3-SVSD Single Shot Insert designed to fit a helium-4 storage dewar, Janis Research
Model HE-3-SVSD Insert

Helpful Resources

Importance of Ultra Low Temperature Research - an interview with Dr. Zuyu Zhao

Complete our Helium-3 System Inquiry Checklist.