Development and operation of superconducting NMR magnet beyond 900 MHz

Toko, Kiyoshi; Satô, Akio; Takeuchi, T.; Itoh, K.; Matsumoto, Shinji; Ozaki, Osamu; Wada, Hitoshi; Yoshikawa, Masayuki; Kamikado, T.; Miki, Takashi; Hase, Takashi; Hamada, Mamoru; Hayashi, Seiji; Kawate, Yoshio; Hirose, R.

doi:10.1109/77.920332

Cited by 28 publications

(16 citation statements)

References 6 publications

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“…During the excitation, the two vacuum pumps were in operation. As reported earlier [1], [3], [5], voltage generations of a few mV in the -NbTi joints were often observed during the excitation of the first 920 MHz magnet. In contrast, no such phenomena took place in this magnet and we need not have decreased the operating current to eliminate such voltage generation.…”

Section: Operationmentioning

confidence: 69%

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Operation of a 930-MHz High-Resolution NMR Magnet at TML

Toko

Matsumoto

Satô

et al. 2005

IEEE Trans. Appl. Supercond.

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A 920-MHz high-resolution NMR spectrometer has been operating at the Tsukuba Magnet Laboratory (TML) since April 2002. It has proved its effectiveness by determining the 3-D structures of protein molecules. To accelerate studies in structural biology and solid-state NMR, a second high-field NMR magnet was developed and installed at TML. Although its basic design was the same as that of the first magnet, some improvements were made. For the innermost coil, a 16%Sn-bronze-processed (Nb Ti) 3 Sn conductor was employed. The increase in the critical current density above that of a 15%Sn-bronze-processed (Nb Ti) 3 Sn conductor made it possible to reduce the conductor size from 3.5 mm 1.75 mm in the first magnet to 2.80 mm 1.83 mm in the second. At the same operating current of the first magnet, the second magnet is expected to operate at 930 MHz. The liquid helium reservoir and the superfluid helium cooler, which were separated in the first system, were united in the same chamber in the new magnet. The latter magnet was energized up to 21.9 T without quenching in March 2004 and has operated in a persistent-mode at that field. It will be utilized mainly for solid-state NMR measurements.Index Terms-High magnetic field, NMR magnet, nuclear magnetic resonance, superconducting magnet.

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Section: Operationmentioning

confidence: 69%

“…We used a bronze-processed conductor with a bronze matrix of Cu-15wt.%Sn-0.3wt.%Ti (Conductor A) for the innermost coil of the first magnet [3]. For that of the second magnet, we retained that conductor, but employed a slightly altered bronze matrix of Cu-16wt.%Sn-0.3wt.%Ti (Conductor B) [4].…”

Section: B Innermost Coilmentioning

confidence: 99%

Operation of a 930-MHz High-Resolution NMR Magnet at TML

Toko

Matsumoto

Satô

et al. 2005

IEEE Trans. Appl. Supercond.

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“…There is a strong demand for high-field superconducting magnets in superconducting applications, such as NMRs [1] and MRIs [2]. The strength of the magnetic field is directly linked to the performance of the device.…”

Section: Introductionmentioning

confidence: 99%

Direct production of Nb3Al superconducting coil by electron beam irradiation on a cold-sprayed cylinder

Ando

Miyazoe

Hirota

et al. 2010

Surface and Coatings Technology

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“…the National Institute for Materials Science (NIMS) (8). We have also developed a prototype of a 920-MHz NMR spectrometer to examine the performance of the magnet by NMR measurements (9).…”

Section: Introductionmentioning

confidence: 99%