Operation of a 930-MHz high-resolution NMR magnet at TML
Operation of a 930-MHz high-resolution NMR magnet at TML
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在 TML 下操作 930 MHz 高分辨率 NMR 磁体
DOI：
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发表时间：
2003
影响因子：
1.8
通讯作者：
R. Hirose
中科院分区：
文献类型：
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作者：
T. Kiyoshi;M. Yoshikawa;Akio Sato;K. Itoh;Shinji Matsumoto;Hitoshi Wada;S. Ito;T. Miki;T. Miyazaki;T. Kamikado;O. Ozaki;T. Hase;M. Hamada;S. Hayashi;Y. Kawate;R. Hirose
自2002年4月以来，920兆赫高分辨率核磁共振波谱仪一直在筑波磁铁实验室（TML）运行。它已经通过确定蛋白质分子的三维结构证明了其有效性。为了加速结构生物学和固态NMR的研究，TML开发并安装了第二个高场NMR磁体。虽然它的基本设计与第一个磁铁相同，但进行了一些改进。对于最里面的线圈，采用16%锡青铜处理的（Nb，Ti）/sub 3/Sn导体。临界电流密度的增加高于15%Sn青铜处理的（Nb，Ti）/sub 3/Sn导体的临界电流密度，使得可以将导体尺寸从第一磁体中的3.5mm/spl倍/1.75mm减小到第二磁体中的2.80mm/spl倍/1.83mm。在第一磁体的相同操作电流下，第二磁体预期在930 MHz下操作。在第一个系统中分离的液氦储存器和超流氦冷却器在新磁体中被合并在同一个腔室中。后者的磁铁被通电高达21.9 T，而在2004年3月淬火，并已在该领域的持续模式。它将主要用于固态NMR测量。
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)/sub 3/Sn conductor was employed. The increase in the critical current density above that of a 15%Sn-bronze-processed (Nb,Ti)/sub 3/Sn conductor made it possible to reduce the conductor size from 3.5 mm /spl times/ 1.75 mm in the first magnet to 2.80 mm /spl times/ 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.