Cryogen Free (CF) Systems 
| CF Magnets with Variable Temperature Sample Space |
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Cryogenic Ltd is offering a state-of-the-art system that provides simultaneous controlled cooling of both the samle and the magnet using a single cryocooler with good all round performance.
Most cryogen free magnets are built with room temperature access to the high field space. Any requirement for sample measurement at low temperature means the purchase of an additional cryostat for installation in the magnet bore. This is no longer necessary with the new integrated system.
The Variable Temperaure Insert (containing the sample) is built into the bore of the CFM, thus providing both variable temperature and magnetic field environments for the sample using a single cryocooler.
The cryogen free insert provides a dynamic temperature controlled environment in the range 1.6K to 300K as standard. This range can easily be extended further down to 1K or by using helium-3 to below 1K
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| Optical, Neutron Scattering and Beam Line Systems |
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For optical, neutron and particle beam experiments, Cryogenic offers a range of split pair magnets. These are of standard design and allow strong magnetic fields to be produced in a small volume with maximum access to the working space. Split pair coils can be mounted to provide either a vertical field with horizontal access or a horizontal field offering horizontal or vertical access.
Large windows in the support structure between the coils allow access to the sample. This configuration forms the basis of the Cryogenic Optimag series of split pair magnet systems. For other applications a thin walled aluminium former and aluminium windows will allow transmission of the beam.
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| Specifications |
| CF Varitemp Cryostat |
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For experiments with an external magnet such as an electromagnet, pulse field magnet, cryogen free magnet or without a magnet at all, Cryogenic produces a small Varitemp cryostat. These cryostats have a helium reservoir of 7 or 15 litres and a built-in VTI which extends into a small tail below the cryostat. Some Varitemp cryostats are provided with optical windows and make a convenient and low cost way of carrying out experiments at low temperatures down to 1.6K.
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| Cryogen Free ESR Systems |
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Cryogenic offers a + 16 Tesla 5ppm magnet with a large room temperature bore. The magnet is permanently fitted with leads and a superconductivity switch for persistent mode operation.
ESR measurement systems require high homogeneity, which can be maintained over a wide range of fields. Experiments are performed at fixed frequency and the spectrum is obtained by sweeping the magnetic field. This requires the field to be stable in spatial homogeneity and change steadily and repeatedly over time. As the spectra can vary considerably in width it is essential to be able to control the magnet current and therefore the field accurately over a wide range of field with sufficient precision to see narrow resonance's.
With a cryogen free system it is not necessary to reduce helium consumption, as there is no liquid helium to evaporate. Instead it is merely required to have accurate and smooth ramping of the magnet current. With the Cryogenic power supply it is possible to set and measure the current accurately and perform sweeps by maintaining and regulating a small levitate across the inductance of the magnet.
The magnet is made from NbTi and NbSn superconductors with truly superconducting joints to provide good persistent mode performance. A single magnet power supply is provided for the magnet. The ramp rates available are from approximately 10-8 to 10-3 per second of full value. A single current transducer is supplied to measure the current to 1pppm and output the result to the computer on the IEEE bus. A control computer is used to control the magnet field and to drive the temperature controller using the GPIB interface.
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| CF He-3 Inserts for use in Cryogen Free Variable Temperature Inserts. |
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The Cryogenic range of Helium-Three inserts is designed as an alternative to the standard sample probe. The inserts can extend the range of experimental temperatures accessible in a Cryogen-Free variable temperature sample space beyond the standard 1.6K-300K. Using only the cooling power of the VTI and two internal temperature-controlled sorption pumps, the sample platform of the Helium-Three Insert can be maintained at any temperature from below 300mK to above 300K.
There are three inserts in the range: A 28mm insert to fit 30mm VTIs, a 22mm insert for 24mm VTIs and a special 16mm insert designed to fit the sample space of the Cryogenic S600 and S700 SQUID magnetometers. These inserts have working volumes of liquid 3He of 2cc, 1.5cc, and 0.9cc respectively.
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| Custom and Industrial Magnets |
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Cryogenic Ltd. makes customised cryogen free magnets for specific and industrial applications. The company is well placed to help customers plan new projects involving magnets and low temperatures.
The company designs and builds tailor-made systems for many applications. Recent projects have involved magnets for nuclear research, mineral separation, magnets for MRI and other medical applications. Illustrated is one of the larger horizontal magnet field systems, a 6 Tesla 600mm room temperature bore cryomagnet.
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| CFM080923 |
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