论文信息 - Measuring field multipoles in accelerator magnets with small-apertures by an oscillating wire moved on a circular trajectory

Measuring field multipoles in accelerator magnets with small-apertures by an oscillating wire moved on a circular trajectory

A method based on an oscillating wire for measuring the field quality in accelerator magnets with small apertures of the order of 10 mm is proposed. The wire is positioned step-by- step on the generators of a cylindrical domain inside the magnet aperture, i.e. its end-points at the stages are moved on a circular trajectory. The amplitudes of the wire's forced oscillations are measured and related to field harmonics by a suitable analytical model. In this paper, the analytical model, the measurement procedure, and the measurement system architecture of the oscillating wire method are presented. The method is validated by comparison with the standard rotating-coil system. A case study on small-aperture, permanent-magnet quadrupoles constructed for the Linac4 injector at CERN is illustrated.

[1] Dino Zangrando,et al. A stretched wire system for accurate integrated magnetic field measurements in insertion devices , 1996 .

[2] Animesh Jain. Basic theory of magnets , 1997 .

[3] H. Aihara,et al. International Scoping Study (ISS) for a future neutrino factory and Super-Beam facility. Detectors and flux instrumentation for future neutrino facilities , 2007, 0712.4129.

[4] Pasquale Arpaia,et al. On-field validation of the new platform for magnetic measurements at CERN , 2009 .

[5] S. Russenschuck. Field Computation for Accelerator Magnets: Analytical and Numerical Methods for Electromagnetic Design and Optimization , 2010 .

[6] Kurt Artoos,et al. Study of the electronics architecture for the mechanical stabilisation of the quadrupoles of the CLIC linear accelerator , 2010 .

[7] J. Jowett. Facilities for the Energy Frontier of Nuclear Physics , 2011, 1109.0135.

[8] Michele Modena,et al. STATUS OF CLIC MAGNETS STUDIES , 2011 .

[9] Pasquale Arpaia,et al. A Model-Driven Domain-Specific Scripting Language for Measurement-System Frameworks , 2011, IEEE Transactions on Instrumentation and Measurement.

[10] J. Dilling. International Nuclear Physics Conference 2010 (INPC2010) , 2011 .

[12] M. Buzio,et al. In situ calibration of rotating sensor coils for magnet testing. , 2012, The Review of scientific instruments.