Characterization and tuning of ultrahigh gradient permanent magnet quadrupoles

Authors

Stefan Becker, Universität MunchenFollow
M. Bussmann, Forschungszentrum Dresden-Rossendorf FZDFollow
Sebastian Raith, Universität MunchenFollow
Matthias Fuchs, University of Nebraska - LincolnFollow
R. Weingartner, Max-Planck-Institut für Quantenoptik
P. Kunz, Universität Mainz
W. Lauth, Universität MainzFollow
U. Schramm, Forschungszentrum Dresden-Rossendorf
M. El Ghazaly, Universität Mainz
F. Gruner, Max-Planck-Institut für Quantenoptik
H. Backe, Universität MainzFollow
D. Habs, Max-Planck-Institut für Quantenoptik

Date of this Version

2009

Document Type

Article

Citation

Physical Review Special Topics- Accelerators and Beams 12, 102801(2009); DOI: 10.1103/PhysRevSTAB.12.102801

Comments

Copyright 2009 The American Physical Society. Used by permission.

Abstract

The application of quadrupole devices with high field gradients and small apertures requires precise control over higher order multipole field components. We resent a new scheme for performance control and tuning, which allows the illumination of most of the quadrupole device aperture because of the reduction of higher order field components. Consequently, the size of the aperture can be minimized to match the beam size achieving field gradients of up to 500 T m^-1 at good imaging quality. The characterization method based on a Hall probe measurement and a Fourier analysis was confirmed using the high quality electron beam at the Mainz Microtron MAMI