Search

We developed a superconducting magnet which is suitable for a novel spectroscopy. The methodology of the spectroscopy was suggested by Fuke. This enables to combine NMR (Nuclear Magnetic Resonance) spectroscopy with mass spectroscopy. In order to realize the spectroscopy, the magnet needs two homogeneous regions of 12 T and 4 T, respectively. The field gradient between two regions is required to be high enough. The coil structure is robust against high stress due to such an asymmetric field. The magnet is shielded actively and has a horizontal access room temperature bore of 155 mm diameter. [ABSTRACT FROM AUTHOR]

As a milestone in the 1-GHz NMR magnet project that is being carried out at the Tsukuba Magnet Laboratory (TML), a 920-MHz high-resolution NMR magnet was successfully manufactured. It is made of 15%Sn-bronze-processed (Nb, Ti)aSh, Ta-reinforced (Nb, Ti)[sub 3]Sn, and NbTi conductors. The room-temperature bore of the cryostat is 54 mm in diameter. All the coils are cooled with pressurized superfluid helium at 1.55 K. The magnet was moved to a new building of the TML in December 2001. A persistent operation at 920 MHz started in April 2002. The field homogeneity after correcting with superconducting shim coils was less than 0.1 ppm in a sample volume. Field decay decreased to below 1.3 Hz/h at the beginning of July. NMR measurements using this magnet started in July. [ABSTRACT FROM AUTHOR]

Examines the field performance of a high-resolution nuclear magnetic resonance superconducting magnet. Persistent-mode operation of the magnet; Field decay; Field homogeneity.