Research Papers in Physics and Astronomy


Date of this Version


Document Type



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


Copyright 2009 The American Physical Society. Used by permission.


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