The unique features of HTS offer opportunities and challenges to a number of applications. In this paper we focus on NMR and MRI magnets, illustrating them with the NMR/MRI magnets that we are currently and will shortly be engaged: a 1.3 GHz NMR magnet, an “annulus” magnet, and an MgB2 wholebody MRI magnet. The opportunities with HTS include: 1) high fields (e.g., 1.3 GHz magnet); 2) compactness (annulus magnet); and 3) enhanced stability despite liquid-helium-free operation (MgB2 wholebody MRI magnet). The challenges include: 1) a large screening current field detrimental to spatial field homogeneity (e.g., 1.3 GHz magnet); 2) uniformity of critical current density (annulus magnet); and 3) superconducting joints (MgB2 magnet).
목차
Abstract 1. INTRODUCTION 2. Field and Temperature Ranges 3. Bulk Disk and Thin Plate 4. OPPORTUNITIES: EXAMPLES 4.1. HIGH FIELD 4.2. COMPACT MAGNET 4.3. OPERATION AT ≥10-K & STABILITY 5. CHALLENGES: EXAMPLES 5.1. SCREENING-CURRENT FIELD (SCF) 5.2. JC UNIFORMITY 5.3. SUPERCONDUCTING SPLICES 6. CONCLUSIONS REFERENCES
저자
Yukikazu Iwasa [ MIT ]
Corresponding author
Juan Bascunan [ MIT ]
한승용 [ Seungyong Hahn | Massachusetts Institute of Technology (MIT) ]