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In this paper a new measurement system for the polarity check of all the superconducting magnets that will compose the Large Hadron Collider (LHC) is described. The polarity checker is a scanning probe that, thanks to a rotating Hall plate, performs a complete local analysis of the magnet under test. By Fourier analysis of the radial component of the magnetic field picked up by the Hall sensor, the...
This paper describes the design and operation of the "Polarity Checker", a scanning probe designed to check multipole field order, type and polarity of superconducting LHC magnets. First we introduce the measurement method, based on the harmonic analysis of the radial field component picked up by a rotating Hall sensor at different current levels. Then we describe the hardware and the software...
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