High Homogeneity Solenoids

Cryomagnetics has considerable experience in the engineering and manufacturing of high homogeneity magnets. By high homogeneity, we mean superconducting magnets with better than +/- 0.01% (100 ppm) maximum central field variation over a 10mm diameter spherical volume (DSV).

In practice, the actual magnet winding process cannot duplicate the computer-generated magnet design specification. Trim coils (shims) must be added to correct inhomogeneities. Many magnet designs can achieve +/- 0.001% (10 ppm) over a 10mm DSV homogeneity with trim coils wound in series with the main coil. This insures homogeneity specification is maintained throughout the entire field range of the superconducting magnet.

Other applications, such as NMR experimentation, require the superconducting magnet to have 1 ppm or 0.1 ppm homogeneity over a large homogeneous volume. This is accomplished by the addition of separately chargeable superconducting shim coils. First-order shim coils can achieve 1 ppm homogeneity and include the coils X, Y, Z, Z². Second order shim coils can achieve 0.1 ppm homogeneity and include the coils X²-Y², XY, ZY, and ZX.

The majority of high-homogeneity superconducting magnets are custom built to your specifications. Contact us with your specifications.

*Standard High Homogeneity Solenoids*
Model	Field	Bore	Homogeneity*	Current	Inductance
70-200-10P	7.0T	2.00"	+/- 10 ppm	78A	7.0H
70-250-001L	7.0T	2.50"	+/- 100 ppm	35A	15.0H
70-300-001L	7.0T	3.00"	+/- 100 ppm	58A	18.2H
80-200-10P	8.0T	2.00"	+/- 10 ppm	45A	19.4H
80-250-001L	8.0T	2.50"	+/- 100 ppm	47A	36.7H
80-250-10P	8.0T	2.50"	+/- 10 ppm	77A	11.6H
90-200-10P	9.0T	2.00"	+/- 10 ppm	82A	10.2H
90-250-10P	9.0T	2.50"	+/- 10 ppm	80A	17.6H
90-300-10P	9.0T	3.00"	+/- 10 ppm	79A	27.0H

Please check out our NMR Systems Page for additional information on high homogeneity magnet systems.

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Oak Ridge, Tennessee 37830
USA
Phone: (865) 482-9551
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