title: Achievement of 1020MHz NMR.
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.
authors.affiliation: National Institute for Materials Science, 3-13 Sakura, Tsukuba 305-0003, Japan. Electronic address: HASHI.Kenjiro@nims.go.jp.
authors.forename: Kenjiro
authors.initials: K
authors.lastname: Hashi
authors.affiliation: National Institute for Materials Science, 3-13 Sakura, Tsukuba 305-0003, Japan.
authors.forename: Shinobu
authors.initials: S
authors.lastname: Ohki
authors.affiliation: National Institute for Materials Science, 3-13 Sakura, Tsukuba 305-0003, Japan.
authors.forename: Shinji
authors.initials: S
authors.lastname: Matsumoto
authors.affiliation: National Institute for Materials Science, 3-13 Sakura, Tsukuba 305-0003, Japan.
authors.forename: Gen
authors.initials: G
authors.lastname: Nishijima
authors.affiliation: National Institute for Materials Science, 3-13 Sakura, Tsukuba 305-0003, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Goto
authors.affiliation: National Institute for Materials Science, 3-13 Sakura, Tsukuba 305-0003, Japan.
authors.forename: Kenzo
authors.initials: K
authors.lastname: Deguchi
authors.affiliation: National Institute for Materials Science, 3-13 Sakura, Tsukuba 305-0003, Japan.
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Yamada
authors.affiliation: National Institute for Materials Science, 3-13 Sakura, Tsukuba 305-0003, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Noguchi
authors.affiliation: National Institute for Materials Science, 3-13 Sakura, Tsukuba 305-0003, Japan.
authors.forename: Shuji
authors.initials: S
authors.lastname: Sakai
authors.affiliation: Center for Life Science Technologies, RIKEN, 1-7-29 Suehiro, Tsurumi, Yokohama 230-0045, Japan.
authors.forename: Masato
authors.initials: M
authors.lastname: Takahashi
authors.affiliation: Center for Life Science Technologies, RIKEN, 1-7-29 Suehiro, Tsurumi, Yokohama 230-0045, Japan.
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Yanagisawa
authors.affiliation: 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.
authors.forename: Seiya
authors.initials: S
authors.lastname: Iguchi
authors.affiliation: Center for Life Science Technologies, RIKEN, 1-7-29 Suehiro, Tsurumi, Yokohama 230-0045, Japan.
authors.forename: Toshio
authors.initials: T
authors.lastname: Yamazaki
authors.affiliation: Center for Life Science Technologies, RIKEN, 1-7-29 Suehiro, Tsurumi, Yokohama 230-0045, Japan.
authors.forename: Hideaki
authors.initials: H
authors.lastname: Maeda
authors.affiliation: JEOL RESONANCE Inc., 3-1-2 Musashino, Akishima, Tokyo 196-8558, Japan.
authors.forename: Ryoji
authors.initials: R
authors.lastname: Tanaka
authors.affiliation: JEOL RESONANCE Inc., 3-1-2 Musashino, Akishima, Tokyo 196-8558, Japan.
authors.forename: Takahiro
authors.initials: T
authors.lastname: Nemoto
authors.affiliation: JEOL RESONANCE Inc., 3-1-2 Musashino, Akishima, Tokyo 196-8558, Japan.
authors.forename: Hiroto
authors.initials: H
authors.lastname: Suematsu
authors.affiliation: Kobe Steel Ltd., 1-5-5 Takatsukadai, Nishiku, Kobe 651-2271, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Miki
authors.affiliation: Kobe Steel Ltd., 1-5-5 Takatsukadai, Nishiku, Kobe 651-2271, Japan.
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Saito
authors.affiliation: National Institute for Materials Science, 3-13 Sakura, Tsukuba 305-0003, Japan.
authors.forename: Tadashi
authors.initials: T
authors.lastname: Shimizu
keywords: 1020MHz; Bi-2223; Driven mode magnet; High- superconducting magnet; Magnet development