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
Typical Configuration
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
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
Custom temperature sensor configuration (please contact our sales staff)
Custom wiring configurations (please contact our sales staff)
Sample holder upgrades (custom sample holders available)