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T: Fachverband Teilchenphysik

T 92: Neutrino physics without accelerators VIII

T 92.4: Vortrag

Freitag, 3. April 2020, 11:45–12:00, H-HS II

Source activity monitoring in the KATRIN experiment — •Karol Debowski for the KATRIN collaboration — Bergische Universität Wuppertal, Deutschland

The absolute mass scale of neutrinos is one of the open questions in particle physics and cosmology. The KATRIN experiment is set up to measure this parameter with an unprecedented sensitivity of 0.2 eV.

To improve the currently existing mass limits by a factor of 10, all systematic effects in the experimental setup must be controlled. One of the characteristic properties is the activity of the electron source, which is demanded to be stable on the permille level within the time scale of a few hours. To keep track of changes to the total activity, multiple monitoring devices are installed in the KATRIN setup, such as the Forward Beam Monitor (FBM). Located in front of the spectrometers, the FBM measures the total flux of electrons emitted by the source, and thus can provide important information about changing source parameters. Additionally, it can be moved through the whole cross section of the beam tube and measure the flux tube profile.

The performance of the FBM during the first neutrino mass campaigns is presented as well as an outlook on future activities and investigations.