APD Cryogenics first introduced the Displex cryostat range in 1968, which has become world renowned for reliability and performance.

Today, SHI Cryogenics Group has carefully chosen cryostat partners who can produce instrumentation, vacuum shrouds, and accessories for our cryocoolers. This allows SHI Cryogenics Group to concentrate its resources into the technology drivers behind the cryostat, while allowing the end-user to specify their exact requirements to our partners.

Research is demanding lower temperatures, higher capacities, and lower vibration from traditional closed cycle cryocoolers. A policy of continuous product development has produced a range of 4K cryocoolers, higher capacity 10K cryocoolers, and the latest advances in pulse tube technology for vibration sensitive applications.

Hall Effect Studies

Researchers cool their samples in order to limit lattice vibrations; cryogenic temperatures can also isolate the effects of impurities and improper crystal structure. Finally, a more complete sample profile can be mapped varying the temperature.

The DE-202 cryocooler from SHI Cryogenics Group is well suited for this application.  Since sample size is typically small, the capacity of the DE-202 is sufficient. The geometry of the cryocooler with inline valve motor and piston and small heat exchanger dictates that the valve motor is as far as possible from the magnetic poles and therefore eliminates the need for extensions.

How our cryostat partners can assist you.

Since Hall Effect measurements are made in a magnetic field, an aluminum vacuum shroud will be required. Depending on the specifics of your study, vacuum shrouds can be fabricated for 2” gap magnets and 1.5” magnets.

If you have any questions regarding this application, or any other, please contact us and we can provide advice on all your requirements.

Low Vibration Interface

Cryogenic temperatures are needed to provide higher resolution and information on magnetic and phase separations. The problem is that a closed cycle system contributes vibration which is unacceptable in measurement studies and therefore requires vibration dampening.

Such an interface is suitable for:

How our cryostat partners can assist you.

To eliminate the vibration, our partners can provide an interface, which consists of a cylinder, radiation shield and vacuum shroud. The cylinder resembles the two-stage cylinder on the DE-202; being slightly larger it will fit over the DE-202 and provide an annular space which will be filled with exchange gas.

The cylinder attaches to the warm flange of the DE-202 cryocooler; there is a bellow assembly between the two flanges of the cylinder and cryocooler, which allows for the separation of the inner (DE-202) and the outer (cylinder). The space between the two cylinders is then filled with helium gas, supplied by the customer. The inner cylinder cools the exchange gas which in turn cools the outer cylinder where the sample is mounted.

By using such an interface researchers in Mossbauer applications are able to produce line widths of better than 0.3mm/s for 57Fe.

If you have any questions regarding this application, or any other, please contact us and we can provide advice on all your requirements.