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Development and testing of superfluid-cooled 900 MHz NMR magnet.

Author(s) : NAGAI H., SATO A., KIYOSHI T., et al.

Type of article: Article

Summary

As the preliminary step for the 1 GHz NMR spectrometer, a 900 MHz class NMR magnet was manufactured and was successfully operated in December 1999. The magnet is made of 15% Sn-bronze-processed (Nb,Ti)3Sn, Ta-reinforced (Nb,Ti)3Sn, and NbTi conductors. All the coils are cooled with pressurized superfluid helium. The magnet generated a field of 21.20 T in a driven mode and then operated in a persistent mode at 21.17 T corresponding to a proton NMR frequency of 901.2 MHz. During the magnet excitation for 24 h, the superfluid bath temperature was kept constant to below 1.6 K using an automatic control system. After several excitation tests, the magnet was quenched and the rupture disk of the magnet vessel was broken. The size of the cold safety valve and the structure of the rupture disk were checked and modified. Before the reassembly of the magnet cryostat, the modified superfluid cooler for cooling the magnet bath was tested.

Details

  • Original title: Development and testing of superfluid-cooled 900 MHz NMR magnet.
  • Record ID : 2004-0013
  • Languages: English
  • Source: Cryogenics - vol. 41 - n. 9
  • Publication date: 2001/09

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