Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 98: Experimental Methods (general) 4

T 98.6: Vortrag

Donnerstag, 24. März 2022, 17:35–17:50, T-H29

Rydberg Background reduction in KATRIN experiment using THz Radiation* — •Shivani Ramachandran and Enrico Ellinger for the KATRIN collaboration — Bergische Universitaet Wuppertal, Germany

One of the key requirement for the KATRIN experiment to reach its goal sensitivity in measuring the neutrino mass is minimal background. In order to achieve this and eliminate some known contributors, several background suppression methods have already been implemented. Presently the most prominent contribution to the background in the measured signal are electrons produced by thermal ionization of Rydberg atoms which originate from the walls of the main spectrometer.

A plausible method is using THz and microwave radiation which can lead to a reduced lifetime of Rydberg atoms and allow for dedicated stimulated de-excitation. The influence of THz light source in the main spectrometer along with the state and spatial evolution of the Rydberg atoms is studied via simulations. The transition and ionization rates due a light source depend mainly on its frequency, intensity and spectral width. A range of frequencies in the THz regime with different intensities are tested for background reduction. Influence of currently available broadband and narrowband THz sources are also studied. The results show important parameters namely the radiative power, frequency range and number of sources required for effective background reduction with this method. *Gefördert durch die BMBF-Verbundforschung Astroteilchenphysik