Series Connected Hybrid for the Magnet Lab

Design of the 36 tesla series connected hybrid magnet. Design of the 36 tesla series connected hybrid magnet.

In November 2016, the MagLab successfully tested a 36 tesla series connected hybrid (SCH) magnet that breaks the record for field homogeneity for a high-field magnet, will enable new science with a magnetic field that is both very high and very stable, and will operate much more cheaply than comparable magnets.

Started in 2006 with a National Science Foundation grant of $11.7 million, this cylindrical-bore system (40 mm) will be used for high-field nuclear magnetic resonance, condensed matter physics, biology and chemistry. Located in Cell 14 of the Magnet Lab’s DC Field Facility, it is the second strongest continuous field magnet at the MagLab, second only to our world-record 45 tesla hybrid magnet.

Project Specs
Strength 36 tesla
Type Series connected hybrid
Warm bore size

40 mm

Projected completion 2016
Projected cost $11.7 million
Power

14 MW

Uniformity Over 10 mm DSV

1 ppm

Operating current

20kA

Materials

Niobium-tin cable-in-conduit

In this novel design, a set of Florida-Bitter resistive coils (insert) and a set of superconducting cable-in-conduit conductor coils (outsert) are driven in series with the same power supply, rather than independently, as is the case with most of the MagLab’s magnets.

The SCH will offer an extraordinarily stable field. Homogeneity will be improved by an order of magnitude over the world’s highest-homogeneity resistive magnet, the Magnet Lab’s 25 T Keck magnet, through the use of improved resistive magnet current grading and a combination of ferromagnetic and resistive shims. As a result, the SCH will allow scientific exploration into a region of high-field and high-homogeneity parameter space unavailable anywhere else in the world. The field strength of the 36 T will exceed those of other all-superconducting magnets by 62 percent, and those of all-resistive magnets with similar bore and uniformity by 44 percent.

In addition to its greater strengths, the SCH comes with a much lower long-term price tag. It will provide high magnetic fields for one-third the power consumption of traditional powered magnets. Many of the technological achievements developed for our 45 T hybrid magnet will be applied to the SCH. However, the SCH will also contain several new enhancements, such as HTS leads, improved cryogenic support columns, improved superconductor, and higher strength conduit for the CICC that also has thermal properties similar to niobium-tin.

Learn some of the technical details of this new magnet in this pdfScience Highlight.

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View this photo set on Flickr

Staff Contact

Project manager Iain Dixon.

Last modified on 18 November 2016