Design of the magnet system of the neutron decay facility PERC

Xiangzun Wang; Carmen Ziener; Hartmut Abele; Stefan Bodmaier; Dirk Dubbers; Jaqueline Erhart; Alexander Hollering; Erwin Jericha; Jens Klenke; Harald Fillunger; Werner Heil; Christine Klauser; Gertrud Konrad; Max Lamparth; Thorsten Lauer; Michael Klopf; Reinhard Maix; Bastian Märkisch; Wilfried Mach; Holger Mest; Daniel Moser; Alexander Pethoukov; Lukas Raffelt; Nataliya Rebrova; Christoph Roick; Heiko Saul; Ulrich Schmidt; Torsten Soldner; Romain Virot; Oliver Zimmer

doi:10.1051/epjconf/201921904007

Proceedings

Open Access

EPJ Web of Conferences 219, 04007 (2019)
https://doi.org/10.1051/epjconf/201921904007

Design of the magnet system of the neutron decay facility PERC

Xiangzun Wang¹^,2, Carmen Ziener³, Hartmut Abele¹, Stefan Bodmaier², Dirk Dubbers³, Jaqueline Erhart¹, Alexander Hollering², Erwin Jericha¹, Jens Klenke⁴, Harald Fillunger¹, Werner Heil⁵, Christine Klauser¹^,2^,7, Gertrud Konrad¹^,6, Max Lamparth²^,3, Thorsten Lauer⁴, Michael Klopf¹, Reinhard Maix¹^,2^,3, Bastian Märkisch²^,3^a, Wilfried Mach¹, Holger Mest³, Daniel Moser⁶, Alexander Pethoukov⁷, Lukas Raffelt²^,3, Nataliya Rebrova³, Christoph Roick²^,3, Heiko Saul¹^,2^,4, Ulrich Schmidt³, Torsten Soldner⁷, Romain Virot⁷, Oliver Zimmer⁷ and (PERC collaboration)

¹ Technische Universität Wien, Atominstitut, Stadionallee 2, 1020 Wien, Austria
² Physik-Department,Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
³ Physikalisches Institut, Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany
⁴ Forschungs Neutronenquelle Heinz Maier–Leibnitz, Technische Universität München, Lichtenbergstr. 1, 85748 Garching, Germany
⁵ Johannes-Gutenberg Universität, Staudingerweg 7, 55128 Mainz, Germany
⁶ Stefan-Meyer-Institut, Boltzmanngasse 3, 1090 Vienna, Austria
⁷ Institut Laue-Langevin, 71 avenue des Martyrs, CS 20156, 38042 Grenoble Cedex 9, France

^a e-mail: maerkisch@ph.tum.de

Published online: 12 December 2019

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 12 m long superconducting magnet system. It hosts an 8 m 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.

© The Authors, published by EDP Sciences, 2019

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