CS204-DMX-20B

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

Features

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-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

• 4.5" CF flange available but uses non standard ID and may not fit existing chambers
• 8" CF flange available
• 4 K cold head (0.2 W @ 4.2 K) CS204SE-DMX-20 (DE-202S not recommended)
• 6 K cold head (3 W @ 10 K) CS204PE-DMX-20 (DE-202P not recommended)
• Turbo upgrade for faster cooldown times
• 450 K high temperature interface (Not required with the DMX-20 interface, but the 450 K interface is helpful for high temperature performance.)
• 800 K high temperature interface
• Custom temperature sensor configuration (please contact our sales staff)
• Custom wiring configurations (please contact our sales staff)
• Sample holder upgrades (custom sample holders available)