Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 15: Experimental methods I

T 15.2: Talk

Monday, March 15, 2021, 16:15–16:30, To

Investigating the reduction in Rydberg Background — •Shivani Ramachandran for the KATRIN collaboration — Bergische Universitaet Wuppertal, Wuppertal, Germany

The KArlsruhe TRItium Neutrino experiment (KATRIN) is aimed at measuring the effective mass of the electron-antineutrino with a sensitivity of 0.2 eV/c2. This will be achieved by inspecting the endpoint of the beta-electron spectrum of Tritium. There are many known contributors to the background in the measured signal of the KATRIN experiment. The most dominant background source are the electrons produced by thermal ionization of Rydberg atoms which are highly excited atoms with large principal quantum numbers. In this talk the methods of de-excitation of the Rydberg atoms will be discussed and a mechanism for the same to the ground state in the KATRIN main spectrometer will also be investigated. THz and or microwave radiation allows for stimulated de-excitation hence reducing the lifetime of Rydberg atoms. This approach was pioneered by the anti-hydrogen community at CERN. The irradiative power needed for de-excitation and its efficiency will also be studied.