MT26 Abstracts, Timetable and Presentations

Tue-Mo-Or9-05: A Tabletop, Liquid Helium-Free, Persistent-Mode 1.5-T MgB2 “Finger” MRI Magnet: Test of a Half-Scale MRI-Quality Magnet

24 Sept 2019, 12:15

15m

Regency EF

Contributed Oral Presentation Tue-Mo-Or9 - MRI Magnets I

Speaker

Dr Dongkeun Park (Francis Bitter Magnet Laboratory / Plasma Science and Fusion Center, Massachusetts Institute of Technology)

Description

In this paper, we present construction and persistent-mode operation results of a half-scale 1.5-T/54-mm room-temperature bore MgB₂ MRI-quality magnet for the development of a tabletop “finger” MRI system. A half-scale magnet, composed of 5 coil sections and a persistent-current switch, was wound with a single ~590-m long unreacted/monofilament MgB₂ wire having a superconducting joint, and then heat-treated. We operated the magnet, immersed in liquid nitrogen and cryocooled, successfully, achieving a persistent-mode 1.5-T field at the target operating current of 112 A in the temperature range 10-15 K. We also evaluated a temporal stability and a before-shimmed bare field homogeneity of the magnet by using both a hall probe and an NMR probe. Our discussion includes the spatial field homogeneity difference between as-designed and as-built magnets in consideration of manufacturing tolerance.

Acknowledgement: Research reported in this publication was supported by the National Institute of Biomedical Imaging and Bioengineering of the National Institutes of Health under award number R01EB022062.

Presentation materials

MT26_YChoi_DPark_submitted (Tue-Mo-Or9-05).pdf