The KATRIN pre-spectrometer at reduced filter energy

M. Prall, P. Renschler, F. Glück, A. Beglarian, H. Bichsel, L. Bornschein, Z. Chaoui, G. Drexlin, F. Fränkle, S. Görhardt, S. Mertens, M. Steidl, Th Thümmler, S. Wüstling, C. Weinheimer, S. Zadorozhny

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The Karlsruhe Tritium Neutrino (KATRIN) experiment will determine the mass of the electron neutrino with a sensitivity of 0.2 eV (90% CL) via a measurement of the β-spectrum of gaseous tritium near its endpoint of E 0 = 18.57 keV. An ultra-low background of about b = 10mHz is among the requirements on reaching this sensitivity. In the KATRIN main beam line, two spectrometers of MAC-E filter type are used in tandem configuration. This setup, however, produces a Penning trap, which could lead to increased background. We have performed test measurements showing that the filter energy of the pre-spectrometer can be reduced by several keV in order to diminish this trap. These measurements were analyzed with the help of a complex computer simulation, modeling multiple electron reflections from both the detector and the photoelectric electron source used in our test setup.

Original languageEnglish
Article number073054
JournalNew Journal of Physics
StatePublished - Jul 2012
Externally publishedYes


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