ION FOCUSSING and STEERING

Our quadrupole focussing magnets feature precision manufactured magnet poles machined to 1 µm tolerances and extended poles cut from a single billet of magnet iron. This combination significantly reduces abberations and enables smaller beam-spot sizes. Our magnets feature up to 0.8 T pole tip field strength. 3D printed winding devices enable direct winding of copper wires onto the core, resulting in efficient operation with passive cooling and extra wide pole-gaps for detector feedthrough. Special alignment features and a base with micrometer adjusts allow for precise magnet alignment with half the number of adjusts required in competing products.

The magnet length defines the maximum ion rigidity for ion focussing to micro-spots with possible length' from 20 mm to 150 mm. Ion rigidity defines from the product of beam energy times particle mass divided by the square of the particle charge. Doubling the magnet length will double its rigidity limit, but also decrease its minimum spot size, due to increased mean distance to the sample. Furthermore, our flexible manufacturing technique enables arbitrary bore diameters between 4 and 64 mm for either increased focussing strength or beam current capability. We will select the shortest possible magnet and a fitting bore diameter for your application based on physics models and the required ion beams. An arrangement of up to 4 quadrupole magnets results in a focussing unit. Typically, triplets are used for micro-focussing, but we can provide all types of arrangements on request.

Steering magnets enable a fine-tuning of the beam position and a correction of drifts. Steering magnets consists of two dipole magnets rotated against each other by 90° around the beam axis.  We supply standalone steering magnets or magnets pre-mounted onto vacuum tubing for direct integration into beamlines. Together with a signal representing beam current, e.g. a Faraday-Cup or a camera image, they can be auto-tuned using our operation software.

All our magnets are operated by high-stability power supplies from a world-leading supplier with <10 ppm drifts and ripple in order to achieve reliable and reproducible results. On special request power supplies with 1 ppm accuracy can be ordered for further reducing beam-spot diameters on target. All magnets are delivered with our own software controls and ethernet connection for remote operation or can be integrated into your given system through the EPICS interface and the supplier libraries.

A quadrupole magnet doublet mounted on a precision adjustment table.


Aachen Ion Beam Technology
MeV ion beam analysis by RBS, NRA, PIXE, and PIGE
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