High Field Solenoids

Cryomagnetics offers a full range of high field magnets for research in the range of 10 to 17 tesla. Currently, we are developing and testing magnets with field intensities of up to 20 tesla. These magnets all incorporate coils made of NbTi and Nb₃Sn. Recent advances in wire technology allow engineers at Cryomagnetics to develop extremely compact magnets that operate at lower currents than those offered by the competition. In fact, all standard high field magnets offered operate at less than 100 amperes at their 2.2K maximum rated field. A continuing research program into improving manufacturing techniques provides the most reliable high field magnet available. You can be assured the magnet will give years of trouble free service.

Persistent Mode Operation
All standard high field magnets come equipped with a persistent switch unless otherwise specified. Engineering advancements proprietary to Cryomagnetics allows stable persistent mode operation with low helium consumption. Current specifications offer persistent switches of up to 45 ohms normal resistance and 75 milliwatts power required to open the switch. Magnetic field stability is 50 parts per million per hour on most standard high field magnets. Higher field stability is available on some models. Persistent switch specifications vary by model of magnet, so please call for current specifications.

Protection
Cryomagnetics uses a proprietary method of quench protection that does not contribute to high liquid helium consumption during current sweeps. This circuitry is contained within the magnet itself and does not require connection to external passive devices such as resistors. The design of magnet construction allows stored energy to be safely dissipated in the coil itself. The internal protection clamps the voltage to a safe level for personnel and equipment. It is only necessary to make connections to the main current leads and persistent switch heater terminals. Connection to a Cryomagnetics' IPS-series power supply gives additional protection in the unlikely event of an accidental quench -- even if power is interrupted to the supply.

2.2K Operation
When supplied with a Cryomagnetics' lambda point refrigerator, all standard high field magnets can safely be charged to higher magnetic fields. Please refer to the chart below for 2.2K magnetic field ratings, or call us for specifications on magnets not listed. Lambda point operation significantly increases stress levels within the magnet. Careful attention must be given to this important aspect of operation during engineering and construction. Cryomagnetics' continuing programs of improvement addresses these and other considerations to provide you with a magnet free of training.

*Standard High Field Solenoids*
Model	Field (4.2K/2.2K)	Bore	Homogeneity*	Current (4.2K/2.2K)	Inductance
110-150-010	11T / 13T	1.50"	+/- 0.1%	84A / 99A	13.1H
110-200-010	11T / 13T	2.00"	+/- 0.1%	84A / 99A	19.3H
110-300-010	11T / 13T	3.00"	+/- 0.1%	81A / 96A	30.2H
120-150-010	12T / 14T	1.50"	+/- 0.1%	85A / 99A	16.6H
120-200-010	12T / 14T	2.00"	+/- 0.1%	84A / 98A	32.6H
120-300-010	12T / 14T	3.00"	+/- 0.1%	84A / 98A	48.5H
130-150-010	13T / 15T	1.50"	+/- 0.1%	84A / 97A	22.5H
130-200-010	13T / 15T	2.00"	+/- 0.1%	81A / 94A	33.5H
130-300-010	13T / 15T	3.00"	+/- 0.1%	81A / 94A	70.2H
140-150-010	14T / 16T	1.50"	+/- 0.1%	87A / 99A	33.8H
140-200-010	14T / 16T	2.00"	+/- 0.1%	87A / 99A	35.0H
140-300-010	14T / 16T	3.00"	+/- 0.1%	82A / 94A	108H
150-150-010	15T / 17T	1.50"	+/- 0.1%	87A / 99A	46.0H
150-200-010	15T / 17T	2.00"	+/- 0.1%	85A / 96A	80.0H
150-300-010	15T / 17T	3.00"	+/- 0.1%	83A / 94A	162H
160-200-010	16T / 18T	2.00"	+/- 0.1%	84A / 95A	123H

1006 Alvin Weinberg Drive
Oak Ridge, Tennessee 37830
USA
Phone: (865) 482-9551
Fax: (865) 483-1253