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Examples of Custom Engineered Cryogenic Systems

In addition to their complete line of laboratory cryogenic equipment, Janis Research offers a wide range of award-winning custom system design capabilities. With in-house computing facilities, computerised designs and manufacturing capabilities, Janis’ experienced physicists and engineers are readily available to discuss your special requirements for any type of cryogenic application

As a worldwide leader in laboratory cryogenics, Janis has developed many custom cryogenic configurations. Many of these have been refined into a standard product line and are available from inventory.

Cryostat for high-resolution magnetic resonance imaging

This cryostat was developed for intraoperative magnetic resonance imaging (MRI) by groups at Columbia University, Duke University, and DuPont. These cryostats are used to cool a set of high temperature superconducting (HTSC) radio-frequency receiver coils located near the patient or object to be imaged.

TSC receiver coils can produce the highest resolution images for the clinician, but place stringent requirements on the cryostat used to cool the coils in order that image quality is preserved. Here a specially-designed, non-magnetic vacuum tail is used to enclose the coils. The mechanical strength of this material under evacuation is critical to proper function as the coils are placed quite close to the inner wall of the vacuum tail. The tail is also translucent and provides the operator with the ability to visually position the coils with respect to the patient. The coils are thermally anchored to a non-metallic substrate and are able to be translated via the precision manipulators at the top of the cryostat (i.e., on the right-hand side of the photo). The cryostat is also easy to operate as it employs Janis’ SuperTran technology.

Superconducting magnet system for use with Rigaku x-ray generator and theta/theta wide-angle goniometer 3TL-STL-XRAY split superconducting magnet

Shown is a superconducting magnet system for use with a Rigaku x-ray generator and theta/theta wide-angle goniometer. The sample is placed in a high magnetic field (0 to 40,000 G) and its temperature can be varied between 2.5 and 300 K. The sample can be introduced into the high-field region and located precisely with the aid of a UHV compatible translation stage. Samples can be changed without disturbing or warming up the magnet or the Dewar that contains it.

Two side looking windows offer a wide-angle X-ray beam path to the sample (traveling in vacuum), allowing access to the incoming and diffracted beams through angles of 0 to 38. The compact design allows the magnet system to fit precisely within the confines of the X-ray generator and goniometer.

The complete system includes heaters, field-independent thermometry, an automatic temperature controller, and a superconducting magnet power supply for charging and discharging the magnet. A high-efficiency helium transfer line is also included for continuous cooldown of the sample.

Scanning tunneling microscopy (STM) superconducting magnet system with optical access. Omicron71 superconducting magnet

An 8 T split superconducting magnet system has been designed and built for a scanning tunnelling microscope with optical access to the microscope cooling stage. The microscope is top-loaded into a UHV space that can be baked out to a temperature of 150 °C without affecting the superconducting magnet or the rest of the cryostat. The system offers variable temperatures from below superfluid helium temperatures up to room temperature. Several variations are available on this basic design, enclosing bottom optical access, cryostats for scanning near-field optical microscopes, atomic force microscopes, etc.

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