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Description
A measurement bench, dedicated to the characterization of pulsed magnets such as injection kickers, is under development at ALBA.
The bench employs a modified vibrating wire technique allowing to measure high frequency magnetic fields in the range of hundreds of kHz.
In the traditional vibrating wire technique an AC current carrying wire is stretched through the bore of the magnet and the force acting on the wire is proportional to the product of the wire current and the magnet field.
A vibration of the wire is observed when the frequency of the wire current happens to be equal to the natural resonant frequency of the wire, typically a few hundreds of Hz.
To characterize the high frequency behavior of the magnet, the measurement is modified by offsetting the frequency of the wire current by an amount equal to the magnet excitation frequency. This condition results in a resonant excitation of the wire vibration independently of the magnet field frequency.
A feedback system based on the continuous excitation of multiple frequencies allows to track the resonant frequency of the wire, drastically increasing the measurement accuracy.
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