Bonn 2020 – scientific programme
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T: Fachverband Teilchenphysik
T 6: Neutrino physics without accelerators I
T 6.3: Talk
Monday, March 30, 2020, 17:00–17:15, H-HS IV
Calibrating the KATRIN main spectrometer with condensed 83mKr films — •Alexander Fulst for the KATRIN collaboration — Institut für Kernphysik, WWU Münster
The Karlsruhe Tritium Neutrino (KATRIN) experiment is a direct measurement of the neutrino mass from the kinematics of the tritium β-decay aiming for a sensitivity of 0.2 eV/c2 (90% C.L.) after five years of operation. It uses an electrostatic spectrometer working in MAC-E-filter mode to analyze energies of beta-electrons generated in the windowless gaseous tritium source (WGTS). The experiment recently published the results of its first science run, establishing a new upper limit of mν< 1.1 eV/c2 (90% C.L.). Several sources are used for absolute energy calibration, monitoring and precise determination of the spectrometer’s transmission function. One of them is the Condensed Krypton Source (CKrS) developed in Münster, which utilizes nearly monoenergetic conversion electrons from a 83mKr film. Measuring the transmission properties is especially necessary in the shifted analysis plane (SAP) configuration which reduces the volume between the detector and the analysis plane in the spectrometer. The SAP setting presents a new way to reduce the volume dependent Rydberg background of the spectrometer but can lead to less homogeneous electric potentials and magnetic fields, requiring a precise calibration in order to perform an accurate neutrino mass analysis.
A short overview over the system is given and calibration measurements of the SAP are presented and compared to simulations. This work is supported under BMBF contract number 05A17PM3.