Magnetic field measurements for fast-changing magnetic fields

Several recent applications for fast ramped magnets have been found that require rapid measurement of the field quality during the ramp. (In one instance, accelerator dipoles will be ramped at 1 T/sec, with measurements needed to the accuracy typically required for accelerators.) We have built and t...

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Bibliographic Details
Published in:IEEE Transactions on Applied Superconductivity 2005-06, Vol.15 (2), p.1221-1224
Main Authors: Jain, A., Escallier, J., Ganetis, G., Wing Louie, Marone, A., Thomas, R., Wanderer, P.
Format: Article
Language:English
Subjects:
Accelerator magnets
ACCELERATORS
ACCURACY
AMPLIFIERS
Applied sciences
Boards
Circuit properties
Circuit testing
Coils (windings)
Costs
Cylinders
DIPOLES
EDDY CURRENTS
Electric, optical and optoelectronic circuits
Electrical engineering. Electrical power engineering
Electromagnets
Electronic circuits
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Exact sciences and technology
Facility for antiproton and ion research
fast ramped magnets
Harmonic analysis
HARMONICS
Life estimation
Magnetic analysis
Magnetic field measurement
MAGNETIC FIELDS
MAGNETS
PARTICLE ACCELERATORS
PRINTED CIRCUITS
Ramps
READOUT SYSTEMS
Signal analysis
Signal convertors
Studies
superconducting accelerator magnets
SUPERCONDUCTIVITY
System testing
Various equipment and components
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Description
Summary:Several recent applications for fast ramped magnets have been found that require rapid measurement of the field quality during the ramp. (In one instance, accelerator dipoles will be ramped at 1 T/sec, with measurements needed to the accuracy typically required for accelerators.) We have built and tested a new type of magnetic field measuring system to meet this need. The system consists of 16 stationary pickup windings mounted on a cylinder. The signals induced in the windings in a changing magnetic field are sampled and analyzed to obtain the field harmonics. To minimize costs, printed circuit boards were used for the pickup windings and a combination of amplifiers and ADC's used for the voltage readout system. New software was developed for the analysis. Magnetic field measurements of a model dipole developed for the SIS200 accelerator at GSI are presented. The measurements are needed to ensure that eddy currents induced by the fast ramps do not impact the field quality required for successful accelerator operation.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2005.849536