4 Kelvin
Closed Cycle Refrigerator Systems
from Janis and SHI

The proven Janis cryostat design for Mössbauer spectroscopy is extended to lower temperatures with the introduction of the SHI-850-5 and SHI-850-1 cryostat systems.  With base temperatures of less than 4.5 K and 6 K respectively, the SHI-850-5 and SHI-850-1 cryostats combine liquid helium temperatures with the convenience of a closed cycle system.  The exchange gas environment ensures even cooling and offers fast sample exchange.

The Janis design features the following advantages:

• Proven design for Mössbauer spectroscopy with very low line broadening.
• Suitable for samples of any shape or constitution (including powders and liquids) because the system does not rely on the thermal conductivity of samples for cooling.
• Fast sample exchange since the cryostat does not need to be warmed up to change samples.
• Hassle-free integration into the laboratory: a vibration isolation stand is included with every system, so no independent stands or mounts need to be constructed in the laboratory.
• No permanent installation in the laboratory required, easily transported/moved.
• Flexible design may be used for other applications.

Model SHI-850-5 with stand

• Vibration isolation mounting stand
• Vibration isolation bellows
• Isothermal static helium gas sample chamber
• Optical vacuum jacket and radiation shield with two mylar windows
• Gold plated OFHC copper sample holder
• 10-pin electrical feedthrough for customer wiring into the sample area
• Two spare electrical access ports
• Evacuation valve and safety pressure relief
• 4 K closed cycle system components

• Additional electrical feedthroughs (BNC, SMA, multipin, and others)
• High temperature (500 K, 800 K)
• Additional optical window ports for UV/vis measurements
• Larger or smaller diameter sample chamber
• Custom configurations.
• Complete turnkey systems, including temperature controller and pumping station, are available.

Please click here to view the specifications and mechanical drawing of Sample in Static Exchange Gas Systems for Mössbauer Spectroscopy (SHI-850 series).