# Design of the Magnet System of the Neutron Decay Facility PERC

Abstract : The PERC (Proton and Electron Radiation Channel) facility is currently under construction at the research reactor FRM II, Garching. It will serve as an intense and clean source of electrons and protons from neutron beta decay for precision studies. It aims to contribute to the determination of the Cabibbo-Kobayashi-Maskawa quark-mixing element $V_{ud}$ from neutron decay data and to search for new physics via new effective couplings. PERC's central component is a 12m long superconducting magnet system. It hosts an 8m long decay region in a uniform field. An additional high-field region selects the phase space of electrons and protons which can reach the detectors and largely improves systematic uncertainties. We discuss the design of the magnet system and the resulting properties of the magnetic field.
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https://hal.archives-ouvertes.fr/hal-02154107
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Submitted on : Wednesday, June 12, 2019 - 4:59:42 PM
Last modification on : Friday, July 19, 2019 - 3:33:06 AM

### Citation

Xiangzun Wang, Carmen Ziener, Hartmut Abele, Stefan Bodmaier, Dirk Dubbers, et al.. Design of the Magnet System of the Neutron Decay Facility PERC. International Workshop on Particle Physics at Neutron Sources 2018, May 2018, Grenoble, France. ⟨hal-02154107⟩

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