Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 99: Methods in Astroparticle Physics IV

T 99.3: Vortrag

Freitag, 4. April 2025, 09:30–09:45, VG 3.101

Enhancing the energy resolution of MAC-E filters using a Transverse Energy Compensator (TEC) — •Richard Salomon, Kevin Gauda, Kyrill Blümer, Christian Gönner, Volker Hannen, and Christian Weinheimer — Universität Münster - Institut für Kernphysik, Münster, Deutschland

Precise electron spectroscopy with energy resolutions on the eV-scale is currently possible using magnetic adiabatic collimation with an electrostatic filter. Such a MAC-E filter is currently in use at the Karlsruhe Tritium Neutrino (KATRIN) experiment, where an energy resolution of 2.7 eV is achieved in the standard measurement configuration.
This talk focuses on a novel method to improve the energy resolution of MAC-E filters. It can be shown that accelerating electrons in a Wideröe-type drift tube with a polynomial voltage ramp in a high magnetic field creates an angular-dependent energy gain compensating the missing longitudinal energy component in the analyzing plane. In the KATRIN example, a Transverse Energy Compensator (TEC) can lead to an improvement by up to an order of magnitude, while other configurations might benefit even more. If combined with a time-of-flight measurement, it is possible to obtain a differential spectrum measurement with a sub-eV energy resolution, which is necessary to probe the inverted neutrino mass ordering.
This idea by Christian Weinheimer has been submitted as a provisional patent application under the number 10 2024 126 381 by the University of Münster. This work is supported by BMBF ErUM-Pro 05A23PMA.

Keywords: KATRIN; TEC; transverse energy compensator; energy resolution; neutrino mass