22-27 September 2019
Hyatt Regency Hotel Vancouver
Canada/Pacific timezone

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 Sep 2019, 12:15
15m
Regency EF

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.

Primary authors

Dr Yoonhyuck Choi (Francis Bitter Magnet Laboratory / Plasma Science and Fusion Center, Massachusetts Institute of Technology) Dr Yi Li (Francis Bitter Magnet Laboratory / Plasma Science and Fusion Center, Massachusetts Institute of Technology) Dr Dongkeun Park (Francis Bitter Magnet Laboratory / Plasma Science and Fusion Center, Massachusetts Institute of Technology) Juan Bascuñàn (Francis Bitter Magnet Laboratory / Plasma Science and Fusion Center, Massachusetts Institute of Technology) Dr Yukikazu Iwasa (Francis Bitter Magnet Laboratory / Plasma Science and Fusion Center, Massachusetts Institute of Technology) Hideki Tanaka (Hitachi, Ltd.)

Presentation Materials