Dresden 2013 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 52: Poster - Instrumentation I

HK 52.26: Poster

Mittwoch, 6. März 2013, 16:45–19:00, HSZ 2.OG

Design of the Magnetic Shielding for PERC — •Philip Haiden¹, Jacqueline Erhart¹, Harald Fillunger¹, Miklos Horvath¹, Gertrud Konrad¹, Martin Moser¹, Xiangzun Wang¹, Carmen Ziener², and Hartmut Abele¹ — ¹Atominstitut, TU Wien, Austria — ²Universität Heidelberg, Germany

The new facility PERC is a novel source of neutron decay products, currently under development by an international collaboration. Its main component is a more than 11 m long superconducting magnet system (up to 6 T). In order not to disturb other experiments in the vicinity of PERC, we have designed a magnetic shielding. The finite element method (COMSOL Multiphysics) has been used to determine the most suited geometry for the shielding. The following considerations were taken into account: the magnetic stray field is suppressed to the cardiac pacemaker level (0.5 mT at less than 3.0 m), the internal magnetic field and its homogeneity (up to 10⁻⁴) are not disturbed, the additional forces onto the coils are not destructive, and the shielding deals with the limited space conditions. For experimental reasons, the magnet geometry is non-axisymmetric and therefore has to be simulated in 3D. To reduce the computing time and simultaneously increase the numerical accuracy, we simulated only one half of the geometry, taking advantage of the symmetry both of magnet and shielding. However, to study the influence of the shielding on the particle trajectories we had to simulate the full geometry. The magnetic and the mechanical design of the magnetic shielding for PERC will be presented.