Eur. Phys. J. C (2024) 84: 1258
https://doi.org/10.1140/epjc/s10052-024-13596-7

Regular Article

Measurement of the electric potential and the magnetic field in the shifted analysing plane of the KATRIN experiment

¹ Institute for Astroparticle Physics (IAP), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
² Institute for Data Processing and Electronics (IPE), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
³ Institute for Nuclear Physics, University of Münster, Wilhelm-Klemm-Str. 9, 48149, Münster, Germany
⁴ Istituto Nazionale di Fisica Nucleare (INFN)-Sezione di Milano-Bicocca, Piazza della Scienza 3, 20126, Milano, Italy
⁵ Institute for Technical Physics (ITEP), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
⁶ Department of Physics and Astronomy, University of North Carolina, 27599, Chapel Hill, NC, USA
⁷ Triangle Universities Nuclear Laboratory, 27708, Durham, NC, USA
⁸ Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, Piazza L. da Vinci 32, 20133, Milan, Italy
⁹ Istituto Nazionale di Fisica Nucleare (INFN)-Sezione di Milano, Via Celoria 16, 20133, Milan, Italy
¹⁰ Department of Physics, Faculty of Science, Chulalongkorn University, 10330, Bangkok, Thailand
¹¹ Department of Physics, Carnegie Mellon University, 15213, Pittsburgh, PA, USA
¹² Department of Physics, Faculty of Mathematics and Natural Sciences, University of Wuppertal, Gaußstr. 20, 42119, Wuppertal, Germany
¹³ Institute of Experimental Particle Physics (ETP), Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede-Str. 1, 76131, Karlsruhe, Germany
¹⁴ Departamento de Química Física Aplicada, Universidad Autonoma de Madrid, Campus de Cantoblanco, 28049, Madrid, Spain
¹⁵ Center for Experimental Nuclear Physics and Astrophysics, and Department of Physics, University of Washington, 98195, Seattle, WA, USA
¹⁶ Nuclear Physics Institute, Czech Academy of Sciences, 25068, Řež, Czech Republic
¹⁷ Physics Department, Technical University of Munich, TUM School of Natural Sciences, James-Franck-Straße 1, 85748, Garching, Germany
¹⁸ Max Planck Institute for Physics, Boltzmannstr. 8, 85748, Garching, Germany
¹⁹ Laboratory for Nuclear Science, Massachusetts Institute of Technology, 77 Massachusetts Ave, 02139, Cambridge, MA, USA
²⁰ School of Physics and Center of Excellence in High Energy Physics and Astrophysics, Suranaree University of Technology, 30000, Nakhon Ratchasima, Thailand
²¹ IRFU (DPhP & APC), CEA, Université Paris-Saclay, 91191, Gif-sur-Yvette, France
²² Nuclear Science Division, Lawrence Berkeley National Laboratory, 94720, Berkeley, CA, USA
²³ Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117, Heidelberg, Germany
²⁴ Dipartimento di Fisica, Università di Milano-Bicocca, Piazza della Scienza 3, 20126, Milan, Italy
²⁵ Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489, Berlin, Germany
²⁶ Institute for Theoretical Astrophysics, University of Heidelberg, Albert-Ueberle-Str. 2, 69120, Heidelberg, Germany
²⁷ Institut für Physik, Johannes-Gutenberg-Universität Mainz, 55099, Mainz, Germany
²⁸ Institute for Nuclear Research of Russian Academy of Sciences, 60th October Anniversary Prospect 7a, 117312, Moscow, Russia
²⁹ Institute of Experimental Particle Physics (ETP), Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede-Str. 1, 76131, Karlsruhe, Germany

^a lokhov@kit.edu

Received: 14 August 2024
Accepted: 6 November 2024
Published online: 6 December 2024

Abstract

The projected sensitivity of the effective electron neutrino-mass measurement with the KATRIN experiment is below 0.3 eV (90 % CL) after 5 years of data acquisition. The sensitivity is affected by the increased rate of the background electrons from KATRIN’s main spectrometer. A special shifted-analysing-plane (SAP) configuration was developed to reduce this background by a factor of two. The complex layout of electromagnetic fields in the SAP configuration requires a robust method of estimating these fields. We present in this paper a dedicated calibration measurement of the fields using conversion electrons of gaseous $_{}^{\text{83m}}$Kr, which enables the neutrino-mass measurements in the SAP configuration.