Specifications – American Magnetics AMI Superconducting Magnets User Manual
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Specifications
Magnet Specification Sheet
magnetic resonance (NMR) tests at 4.2K or by calculation if NMR checks are
not possible.
2.
Rated Current - The rated current is the magnet current required to achieve
the rated field.
3.
Maximum Test Field @4.2K - The maximum test field is the maximum field
achieved during AMI testing. The magnet is not warranted for operation at the
maximum test field. AMI performs the test to insure the magnet is of good
design and construction and will operate properly at rated field.
Caution
AMI magnets are not warranted for operation above rated field.
4.
Field-to-Current Ratio - The field-to-current ratio is a number defined to be
the magnetic field produced per amp of magnet current. It is specified in units
of gauss per amp and is generally determined by NMR measurement
techniques.
5.
Homogeneity - Homogeneity is the maximum field deviation from the rated
field specified over a specific length or volume.
6.
Measured Inductance - The inductance of the magnet is determined during
magnet testing using the relationship L = E(
dt
/
dI
).
7.
Charging Voltage (used in test) - The charging voltage is the maximum
voltage developed across the magnet during testing at AMI.
8.
Clear Bore - The minimum magnet bore diameter at operating temperature.
9.
Radial Access - The minimum magnet radial access diameter at operating
temperature. (Split coil systems only).
10. Overall Length (flange to flange) - The measured overall length of the coil
including the end flanges. This dimension excludes the persistent switch and
current lugs if applicable.
11. Maximum Outside Diameter - Maximum outside diameter of the magnet.
12. Weight - Magnet weight.
13. Recommended Persistent Switch Heater Current - The recommended
persistent switch heater current is the amount of current required to guarantee
the persistent switch is in the resistive state.
14. Persistent Switch Heater Nominal Resistance - The persistent switch heater
nominal resistance is the room temperature resistance of the switch heater.
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