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A new bench for measuring magnetic fields of big closed
structures. Performance results
Josep Campmany, Llibert Ribó, Carles Colldelram, Fulvio Becheri, Jordi Marcos,
Valentí Massana
ALBA synchrotron – CELLS, Consorci per a la construcció, equipament i explotació del
Laboratori de llum de sincrotró. Ctra. BP 1413, de Cerdanyola del Vallès a Sant Cugat del Vallès,
Km. 3,3, 08290 Cerdanyola del Vallès, Barcelona, Catalonia (Spain)
Email: [email protected]
The tendency towards building accelerators with high magnetic fields produced by small gap
magnets and the development of cryogenic, microgap or superconducting narrow-gap insertion
devices have raised the challenge to measure big closed magnetic structures.
Usual approach, based on side-measurements made with a Hall probe mounted on the tip of a
motorized arm based on a long granite bench is no more applicable to such closed structures. So,
new concepts and approaches have been developed, mainly based on complex devices that insert
a Hall probe inside the magnetic structure maintaining the desired position by close-loop controls.
The main problem of these devices is that they are not general-purpose oriented: they need a
special vacuum chamber, require a specific geometry of the magnetic structure, or does not
provide full and configurable 3D field-map measurements.
We present in this paper the performance results of a new bench built at ALBA synchrotron
that is simple, multi-purpose and can be a general solution for measuring big closed structures.
Concept of such a bench was already proposed on IMWW18, and during last two years we have
made the detailed design, and we have manufactured, assembled and tested a prototype of this
bench.
We have proved the validity of the concept, both though accurate mechanical measurements as
well as measuring known magnetic structures in order to check the magnetic performance of the
device.