System Description
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Figure4.4: Superconducting Magnet
1 Insert Probe here 6 Helium Tower
2 Bore 7 Metal Plug
3 Nitrogen Tower 8 Insert sample here
4 Nitrogen Ports 9 Vacuum Chamber
5 Helium Ports 10 Magnet
4.5.1 Room Temperature Bore
The helium  and nitrogen tanks are wrapped around a central column known as the magnet
bore. A metal plug normally closes off the top of the bore. Magnets are available with either
standard bore  (54 mm) or  wide bore  (89 mm). Samples  to be analyzed  are introduced  into
the magnet via the top of the bore. Probes, which hold the sample and carry signals to and
from the sample, are inserted from the bottom.