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Magnet Field (B0)
•
Low sensitivity requires
very high field
•
1 Tesla = 10,000 Gauss
cf. 0.3-0.7 G earth’s field
•
Mostly superconductors
Niobium-titanium (9.5 K)
field decay: 5-10 G y
-1
field stability: <0.1 ppm h
-1
1987: Elscint’s Gyrex System
Philips’ vertical HFO System