Reduction of stored-particle background by a magnetic pulse method at the KATRIN experiment

0494427 - ÚJF 2019 RIV US eng J - Journal Article
Arenz, M. - Baek, W. -J. - Bauer, S. - Beck, M. - Beglarian, A. - Dragoun, Otokar - Kovalík, Alojz - Lebeda, Ondřej - Ryšavý, Miloš - Sentkerestiová, Jana - Suchopár, Martin - Vénos, Drahoslav … Total 129 authors
Reduction of stored-particle background by a magnetic pulse method at the KATRIN experiment.
European Physical Journal C. Roč. 78, č. 9 (2018), č. článku 778. ISSN 1434-6044. E-ISSN 1434-6052
R&D Projects: GA MŠMT LM2015056; GA MŠMT LTT18021
Institutional support: RVO:61389005
Keywords : KATRIN experiment * neutrino mass detection * magnetic pulse method
OECD category: Particles and field physics
Impact factor: 4.843, year: 2018

The KATRIN experiment aims to determine the effective electron neutrino mass with a sensitivity of 0.2 eV/c(2) (% 90 CL) by precision measurement of the shape of the tritium beta-spectrum in the endpoint region. The energy analysis of the decay electrons is achieved by a MAC-E filter spectrometer. A common background source in this setup is the decay of short-lived isotopes, such as Rn-219 and Rn-220, in the spectrometer volume. Active and passive countermeasures have been implemented and tested at the KATRIN main spectrometer. One of these is the magnetic pulse method, which employs the existing air coil system to reduce the magnetic guiding field in the spectrometer on a short timescale in order to remove low-and high-energy stored electrons. Here we describe the working principle of this method and present results from commissioning measurements at the main spectrometer. Simulations with the particle-tracking software KASSIOPEIA were carried out to gain a detailed understanding of the electron storage conditions and removal processes.
Permanent Link: http://hdl.handle.net/11104/0287619