Title :
A High-Resolution 1.3-GHz/54-mm LTS/HTS NMR Magnet
Author :
Iwasa, Yukikazu ; Bascunan, Juan ; Hahn, Seungyong ; Voccio, John ; Kim, Youngjae ; Lecrevisse, Thibault ; Song, Jungbin ; Kajikawa, Kazuhiro
Author_Institution :
Francis Bitter Magn. Lab. (FBML) of the Plasma Sci. & Fusion Center (PSFC), Massachusetts Inst. of Technol. (MIT), Cambridge, MA, USA
Abstract :
A high-resolution 1.3-GHz/54-mm low-temperature superconducting/high-temperature superconducting (HTS) nuclear magnetic resonance magnet (1.3 G) is currently in the final stage at the Massachusetts Institute of Technology Francis Bitter Magnet Laboratory. Its key component is a three-coil (Coils 1-3) 800-MHz HTS insert comprising 96 no-insulation (NI) double-pancake coils, each wound with a 6-mm-wide GdBCO tape. In this paper, after describing the overall 1.3-G system, we present innovative design features incorporated in 1.3 G: 1) an NI winding technique applied to Coils 1-3 and its adverse effect in the form of charging time delay; 2) persistent-mode HTS shims; 3) a “shaking” magnet; and 4) preliminary results of Coil 1 operated at 4.2 K.
Keywords :
high-temperature superconductors; nuclear magnetic resonance; superconducting coils; superconducting magnets; GdBCO tape; NI; NI winding technique; charging time delay; frequency 1.3 GHz; high-resolution LTS-HTS NMR magnet; low-temperature superconducting-high-temperature superconductor; no-insulation double-pancake coils; nuclear magnetic resonance magnet; persistent-mode HTS shims; shaking magnet; size 54 mm; size 6 mm; temperature 4.2 K; Coils; High-temperature superconductors; Magnetic noise; Magnetic resonance imaging; Magnetic shielding; Nuclear magnetic resonance; Superconducting magnets; HTS shim coils; High-temperature superconducting (HTS) shim coils; LTS/HTS NMR magnet; SCF shaking magnet; inside-notch double-pancake (DP) coil; inside-notch double-pancake coil; low-temperature superconducting (LTS)/HTS nuclear magnetic resonance (NMR) magnet; screening-current-induced field (SCF) shaking magnet;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2014.2363496
