SAMOP 2023 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 18: Ultra-cold Plasmas and Rydberg Systems I (joint session A/Q)
A 18.3: Vortrag
Mittwoch, 8. März 2023, 15:00–15:15, F303
Deexcitation of Rydberg atoms in the neutrino mass experiment KATRIN using THz radiation* — •Shivani Ramachandran — Bergische Universität Wuppertal (BUW)
The key requirement for the KArlsruhe TRItium Neutrino experiment (KATRIN) in measuring the effective electron anti-neutrino mass with a sensitivity of 200 meV at 90% (C.L.)is, minimal background. In order to achieve that 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 is electrons produced by the thermal ionization of Rydberg atoms. They originate due to the sputtering of 210Pb from inherent radioactivity from the walls of the KATRIN main spectrometer. A plausible method is using THz and microwave radiation (method developed by ASACUSA CERN) 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 presented via simulations. Different species of atoms are sputtered which can lead to two-electron excited states, ultralong-range Rydberg atoms, etc, such possibilities are discussed. The influence of magnetic fields on the emission of ionization electrons is also investigated to understand the background model better.
*Gefördert durch die BMBF-Verbundforschung Astroteilchenphysik