Pulsed-Mode Magnetic Field Measurements with a Single Stretched Wire System

Author:

Vella Wallbank Joseph1ORCID,Buzio Marco2ORCID,Parrella Alessandro2ORCID,Petrone Carlo2ORCID,Sammut Nicholas1ORCID

Affiliation:

1. Department of Microelectronics and Nanoelectronics, Universita ta’ Malta, MSD 2080 Msida, Malta

2. Technology Department, CERN—European Organization for Nuclear Research, 1217 Geneva, Switzerland

Abstract

In synchrotrons, accurate knowledge of the magnetic field generated by bending dipole magnets is essential to ensure beam stability. Measurement campaigns are necessary to characterize the field. The choice of the measurement method for such campaigns is determined by the combination of magnet dimensions and operating conditions and typically require a trade-off between accuracy and versatility. The single stretched wire (SSW) is a well-known, polyvalent method to measure the integral field of magnets having a wide range of geometries. It, however, requires steady-state excitation. This work presents a novel implementation of this method called pulsed SSW, which allows the system to measure rapidly time-varying magnetic fields, as is often needed, to save power or gain beam time. We first introduce the measurement principle of the pulsed SSW, followed by a combined strategy to calculate the absolute magnetic field by incorporating the classic DC SSW method. Using a bending magnet from the Proton Synchrotron Booster located at the European Organization for Nuclear Research as a case study, we validate the pulsed SSW method and compare its dynamic measurement capabilities to a fixed induction coil, showing thereby how the coil calibration must be adjusted according to the field level. Finally, we assess the method’s measurement accuracy using the standard SSW as a reference and present an analysis of the primary noise contributors.

Publisher

MDPI AG

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5. Walckiers, L. (2009, January 16–25). Magnetic measurement with coils and wires. Proceedings of the 2009 CAS-CERN Accelerator School: Specialised Course on Magnets, Bruges, Belgium.

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