The CS202F-DMX-20B is our ultra low vibration closed cycle cryostat for UHV applications. The ARS manufactured DMX-20B interface, like our "B" series cold heads, is a true UHV (10-11 Torr) system where all of the rubber o-ring seals have been replaced with welded joints and metal seals. A CF flange is directly welded to the interface.

The DMX-20B also has the advantage of being easily bakeable to 200 C because the DE-204 cold head can be quickly removed from the DMX-20B interface without breaking vacuum.

The DMX-20 interface opens up a wide range of capabilities never before possible with a closed cycle cryocooler. The CS202F-DMX-20-OM uses a helium exchange gas to decouple the sample from the cold tip of the DE-202 cryocooler. This prevents almost all vibration from being transmitted to the sample. Scientists have demonstrated vibration levels as low as 3-5 nm with the CS202*F-DMX-20.

Because the exchange gas is inherently less efficient than cooling by conduction, the base temperature of the sample will be 1-2 K higher than the cryocooler. Additionally the DMX-20 interface requires a downward orientation of the cold tip to facilitate convective cooling of the exchange gas.


  • Low vibration UHV applications
  • Microscopy applications
  • Surface science
  • Nanomaterials



Typical Configuration


Options & Upgrades

  • Ultra low vibrations (3-5 nm)
  • True UHV (10-11 Torr)
  • Bakeable to 200 C with cold head removed
  • Open sample space
  • Cold tip down orientation
  • Fully customizable


  • Cold head (DE-202AF)
  • Compressor (ARS-4HW)
  • 2 helium hoses
  • DMX-20 ultra low vibration interface
  • 6" rotatable CF flange
  • Nickel plated OFHC copper radiation shield terminating 0.125" short of the cold tip
  • Instrumentation for temperature measurement and control:
    • 10 pin UHV feedthrough
    • 50 ohm thermofoil heater
    • Silicon diode sensor curve matched to (± 0.5 K) for control
    • Calibrated silicon diode sensor (±12 mK) with 4 in. free length for accurate sample measurement
  • Wiring for electrical experiments:
    • 10 pin feedthrough
    • 4 copper wires
  • Sample holder for optical and electrical experiments
  • Temperature controller