22–27 Sept 2019
Hyatt Regency Hotel Vancouver
Canada/Pacific timezone

Thu-Af-Or23-03: Operation and Performance Evaluation of a Conduction-Cooled 400 MHz/66-mm Metal-Clad No-Insulation All-REBCO NMR Magnet

26 Sept 2019, 17:00
15m
Regency CD

Regency CD

Speaker

Jae Young Jang (Korea Basic Science Institute)

Description

Since 2014, an R&D program has been conducted to design, construct, and operate a 400 MHz 66 mm room-temperature bore all-REBCO magnet for high resolution NMR application. It is a collaborative program led by the Korea Basic Science Institute (KBSI) in participation of the Korea Institute of Machinery and Materials, Kunsan National University, National High Magnetic Field Laboratory, Seoul National University, and SuNAM Co., Ltd. The metal-clad no-insulation winding technique was adopted to reduce charging-delay without sacrificing the self-protecting feature of the magnet. Once successfully fabricated in 2018, the magnet was cooled down to the target operating temperature of < 20 K and charged to its rated field of 9.4 T at a nominal operating current of 187 A. After the charging test, we performed field-shimming by use of multi-layered ferromagnetic-shims and room-temperature active shims, after which a field uniformity of 0.2 ppm within 10 mm DSV (diameter spherical volume) was obtained. The well-known field-locking technique was also adopted to improve temporal field stability. Based on our own experience, we discussed a potential of our conduction-cooled no-insulation approach for GHz-class NMR magnets.

Primary authors

Jae Young Jang (Korea Basic Science Institute) Young Jin Hwang (Korea Basic Science Institute) Seungyong Hahn (Seoul National University) Mr Jaemin Kim (Seoul National University) Dr Jun Hee Han (Korea Basic Science Institute) Yungil Kim (SuNAM Co.,Ltd) Mr Kang Hwan Shin (SuNAM Co., Ltd.,) Hunju Lee (SuNAM Co., Ltd.) Dr Sehwan In (Korea Institute of Machinery & Materials) Dr Yong-Ju Hong (Korea Institute of Machinery & Materials) Dr Hankil Yeom (Korea Institute of Machinery & Materials) Kwangmin Kim (National High Magnetic Field Laboratory) Dr Kwang Lok Kim (National High Magnetic Field Laboratory) Mr Hongmin Yang (Kunsan National University) Prof. Minchul Ahn (Kunsan National University) Jeseok Bang (Seoul National University) SangGap Lee (Korea Basic Science Institute)

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