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

Mon-Af-Po1.13-01 [20 & 21] [Invited]: Towards a 1.3 GHz (30.5 T) NMR: Persistent-mode NMR magnet with superconducting joints between high-temperature superconductors

23 Sep 2019, 14:30
Level 2 Posters 1

Level 2 Posters 1

Invited Poster Presentation Mon-Af-Po1.13 - Magnets for NMR


Yoshinori Yanagisawa (RIKEN)


We will describe the first persistent-mode medium magnetic field (400 MHz, 9.39 T) NMR magnet which uses superconducting joints between high-temperature superconductors (HTSs). As an ultimate goal, we aim to develop a high-resolution 1.3 GHz (30.5 T) NMR magnet operated in the persistent-mode [1]. The 1.3 GHz NMR magnet requires superconducting joints between HTSs and those between an HTS and a low-temperature superconductor (LTS). Towards this goal, we have been developing persistent-mode HTS inner coils to be operated in a 400 MHz (9.39 T) NMR magnet, and here we present the first prototype of an inner coil wound with a single piece REBCO conductor [2]. The coil and a newly developed REBCO persistent current switch (PCS) are connected with intermediate grown superconducting (iGS) joints which can transport very high currents in external magnetic fields. To evaluate the performance of the joints with an ultimately stable and homogeneous magnetic field in a real magnet system, the coil is operated in the persistent-mode, generating 0.1 T, in a 9.3 T background magnetic field of a persistent-mode LTS outer coil. A magnetic field drift rate of this 400 MHz LTS/REBCO NMR magnet is <1 ppb/h, sufficient to obtain high-resolution NMR spectra. The 1H NMR spectrum line shape gives a half height width of 1 ppb, demonstrating that the superconducting joints perfectly functions in a high-resolution NMR system. As the next development steps, we will develop a REBCO inner coil with many joints and a Bi-2223 inner coil, which coils will also be tested in the 400 MHz LTS/HTS NMR magnet in the persistent-mode.

[1] Maeda et al, submitted to IEEE TAS
[2] Yanagisawa et al, Presented at ASC2018, 4LPo1E-05

This work is supported by the JST-Mirai Program Grant Number JPMJMI17A2.

Primary authors

Yoshinori Yanagisawa (RIKEN) Renzhong Piao (RIKEN) Yu Suetomi (RIKEN) Kazama Yamagishi (Sophia University) Dr Toshio Yamazaki (RIKEN) Dr Masato Takahashi (RIKEN) Takeshi Ueno (Sophia University) Tomoaki Takao (Sophia University) Dr Kotaro Ohki (Sumitomo Electric Industries, Ltd.) Takashi Yamaguchi (Sumitomo Electric Industries, Ltd.) Tatsuoki Nagaishi (Sumitomo Electric Industries, Ltd.) Dr Hitoshi Kitaguchi (National Institute for Materials Science) Yasuyuki Miyoshi (Japan Superconductor Technology, Inc.) Masatoshi Yoshikawa (Japan Superconductor Technology, Inc.) Mamoru Hamada (Japan Superconductor Technology, Inc.) Kazuyoshi Saito (Japan Superconductor Technology, Inc.) Kenichi Hachitani (JEOL RESONANCE Inc.) Yoshitaka Ishii (Tokyo Institute of Technology) Dr Hideaki Maeda (Japan Science and Technology Agency)

Presentation Materials