Achievement of 1020MHz NMR

Kenjiro Hashi; Shinobu Ohki; Shinji Matsumoto; Gen Nishijima; Atsushi Goto; Kenzo Deguchi; Kazuhiko Yamada; Takashi Noguchi; Shuji Sakai; Masato Takahashi; Yoshinori Yanagisawa; Seiya Iguchi; Toshio Yamazaki; Hideaki Maeda; Ryoji Tanaka; Takahiro Nemoto; Hiroto Suematsu; Takashi Miki; Kazuyoshi Saito; Tadashi Shimizu

doi:10.1016/j.jmr.2015.04.009

Achievement of 1020MHz NMR

J Magn Reson. 2015 Jul:256:30-33. doi: 10.1016/j.jmr.2015.04.009. Epub 2015 May 7.

Authors

Kenjiro Hashi¹, Shinobu Ohki², Shinji Matsumoto², Gen Nishijima², Atsushi Goto², Kenzo Deguchi², Kazuhiko Yamada², Takashi Noguchi², Shuji Sakai², Masato Takahashi³, Yoshinori Yanagisawa³, Seiya Iguchi⁴, Toshio Yamazaki³, Hideaki Maeda³, Ryoji Tanaka⁵, Takahiro Nemoto⁵, Hiroto Suematsu⁵, Takashi Miki⁶, Kazuyoshi Saito⁶, Tadashi Shimizu²

Affiliations

¹ National Institute for Materials Science, 3-13 Sakura, Tsukuba 305-0003, Japan. Electronic address: HASHI.Kenjiro@nims.go.jp.
² National Institute for Materials Science, 3-13 Sakura, Tsukuba 305-0003, Japan.
³ Center for Life Science Technologies, RIKEN, 1-7-29 Suehiro, Tsurumi, Yokohama 230-0045, Japan.
⁴ Center for Life Science Technologies, RIKEN, 1-7-29 Suehiro, Tsurumi, Yokohama 230-0045, Japan; Faculty of Science and Technology, Sophia University, Yotsuya 102-8554, Japan.
⁵ JEOL RESONANCE Inc., 3-1-2 Musashino, Akishima, Tokyo 196-8558, Japan.
⁶ Kobe Steel Ltd., 1-5-5 Takatsukadai, Nishiku, Kobe 651-2271, Japan.

PMID: 25978708
DOI: 10.1016/j.jmr.2015.04.009

Abstract

We have successfully developed a 1020MHz (24.0T) NMR magnet, establishing the world's highest magnetic field in high resolution NMR superconducting magnets. The magnet is a series connection of LTS (low-Tc superconductors NbTi and Nb3Sn) outer coils and an HTS (high-Tc superconductor, Bi-2223) innermost coil, being operated at superfluid liquid helium temperature such as around 1.8K and in a driven-mode by an external DC power supply. The drift of the magnetic field was initially ±0.8ppm/10h without the (2)H lock operation; it was then stabilized to be less than 1ppb/10h by using an NMR internal lock operation. The full-width at half maximum of a (1)H spectrum taken for 1% CHCl3 in acetone-d6 was as low as 0.7Hz (0.7ppb), which was sufficient for solution NMR. On the contrary, the temporal field stability under the external lock operation for solid-state NMR was 170ppb/10h, sufficient for NMR measurements for quadrupolar nuclei such as (17)O; a (17)O NMR measurement for labeled tri-peptide clearly demonstrated the effect of high magnetic field on solid-state NMR spectra.

Keywords: 1020MHz; Bi-2223; Driven mode magnet; High- superconducting magnet; Magnet development.

Publication types

Research Support, Non-U.S. Gov't