High precision measurement of magnetic field using a multiple Hall probe and application to the shimming of the GANIL's spectrograph (SPEG)

Efficient analytical methods for the determination of the shims were established. The calibration of the probes is detailed and the shimming method is summarized. As a final verification, results with real beam are shown. A beam with nominal emittance was conducted up to the focal plane of the spectrograph. A full width at half maximum of 0.26 mm was obtained, corresponding to a resolution of 3.2*10/sup -5/, in good agreement with the expected value.<
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