Magnetic measurement with coils and wires

TL;DR

This paper reviews methods for magnetic measurement in accelerator magnets, focusing on coil-based techniques like rotating coils and stretched wires for precise field characterization.

Contribution

It compares traditional coil methods with recent stretched wire techniques, highlighting their roles in accurate magnetic field measurements.

Findings

Rotating coil method provides comprehensive 2D magnetic field data.

Single stretched wire effectively measures field integrals and magnetic axis.

Coil and wire methods complement point-like measurements for magnet characterization.

Abstract

Accelerator magnets steer particle beams according to the field integrated along the trajectory over the magnet length. Purpose-wound coils measure these relevant parameters with high precision and complement efficiently point-like measurements performed with Hall plates or NMR probes. The rotating coil method gives a complete two-dimensional description of the magnetic field in a series of normal and skew multipoles. The more recent single stretched wire is a reference instrument to measure field integrals and to find the magnetic axis.