Liquid Nitrogen Cooled HTS Magnet for NMR Use

2016 Fiscal Year Final Research Report

• Project/Area Number: 26288012
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Physical chemistry
• Research Institution: National Institute for Materials Science
• Principal Investigator: KITAGUCHI Hitoshi 国立研究開発法人物質・材料研究機構, 機能性材料研究拠点, 副拠点長 (60354304)
• Co-Investigator(Kenkyū-buntansha): 端 健二郎 国立研究開発法人物質・材料研究機構, 強磁場NMRグループ, 主幹研究員 (00321795) ; 武田 和行 京都大学, 理学(系)研究科(研究院), 准教授 (20379308)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: NMR / 高温超伝導マグネット

Outline of Final Research Achievements

Superconducting (SC) magnets are widely used in many NMR systems and operated with liquid helium bath cooling in most cases. High temperature superconductor (HTS) magnets are expected to be operated at higher temperatures without using expensive liquid helium. In this work, we fabricated 1.5T-class REBCO double-pancake (dp) coil stack magnet and performed NMR measurement using this magnet.
The REBCO magnet is a stack of 6 dp coils. The magnet is equipped magnetic steel flanges on both ends in order to shape magnetic flux profile as preferable as possible to generate higher center field. These magnetic flanges increase critical current (6%) and also center field (23%). This magnet generated 1.55T stably at 65 A, 67 K. 2.0T was recorded at 66K. Homogeneous field profile was confirmed using NMR measurement. A drift of magnetic field can be suppressed by using so called “overshoot operation”. These results show that liquid nitrogen cooled HTS magnets can be applicable as for NMR magnet.

Free Research Field

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