American Magnetics AMI Superconducting Magnets - Manual (Page 16)

15
2 Operation
Energizing the magnet
1. If the magnet is equipped with a persistent switch, make sure the persistent
switch heater power supply is switched on and is supplying the appropriate
current to the switch heater. This current value is recorded on the Magnet
Specification Sheet provided with the magnet.
Caution
Only operate the magnet when completely immersed in liquid helium. Failure
to do so may result in magnet and/or system damage.
2. Adjust all programmer/ power supply system controls in accordance with
their respective manuals for system start-up.
3. Set the programmer/ power supply system current limit setpoint to the desired
current level but not to exceed the rated current value recorded on the Magnet
Specification Sheet. Make sure the programmer ramp controls are in the
‘down’ position.
4. Energize the programmer/ power supply system.
5. Set the programmer to the appropriate ramp rate.
6. Verify the programmer/ power supply system stabilizes the magnet current at
the rated current level.
Caution
It is important to always limit the current level of the magnet to never exceed
the rated current recorded on the Magnet Specification Sheet. Exceeding the
rated current specification may void the magnet warranty and may cause
damage to the magnet in the event of a magnet quench.
Caution
During non-persistent magnet operation, the flow through the vapor-cooled
current leads should be checked and balanced to achieve approximately equal
flow thru each lead. Balancing may be achieved by slightly restricting the
flow through the lead with the higher flow. Operation of vapor cooled current
leads with inadequate flow could result in lead damage.
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