CS202-DMX-20B
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.
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-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
- 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)