CS204-DMX-20B

CS204-DMX-20B.png

The CS204-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 system (10-11 Torr) 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 CS204-DMX-20-OM uses a helium exchange gas to decouple the sample from the cold tip of the DE-204 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 CS204F-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.

Applications

  • Low vibration UHV applications

  • Microscopy applications

  • Surface science

  • Nanomaterials

Typical Configuration

  • Cold head (DE-204AF)

  • 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

 

Features

  • 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

 Options & Upgrades