Köln 2004 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 15: Poster Session: Nuclear and Particle Astrophysics

HK 15.2: Poster

Dienstag, 9. März 2004, 13:30–15:30, Foyer

Investigations of trapping conditions in-between the MAC-E-Filters of the KATRIN experiment. — •Kathrin Essig — Helmholtz-Institut für Strahlen- und Kernphysik, Rheinische Friedrich-Wilhelms-Universität, D-53115 Bonn

The KArlsruhe TRItium Neutrino experiment KATRIN[1] aims to determine the absolute mass of the electron antineutrino by measuring the endpoint region of the tritium-β-spectrum with sub-eV sensitivity. The KATRIN setup consists of two MAC-E-Filter (Magnetic Adiabatic Collimation followed by Electrostatic Filter) spectrometers, one low resolution pre-spectrometer followed by a high resolution main-spectrometer.

The electric and magnetic field configurations of this lined up spectrometers yield to penning trap conditions for electrons. These trapped electrons are thought of as a major source of background events, hence their number has to be minimized. The aim of this talk is to discuss the trapping conditions of electrons based on computer simulations and to present methods to remove them or to minimize their storage time. Therefore cooling processes like synchrotron radiation and residual gas interactions due to elastic and inelastic scattering or ionization have been studied. Besides cooling there is still the option of an active removal of stored particles by the pre-spectrometer’s electric dipole fields.

Supported by the BMBF under contract 05CK2PD1/5.

[1] A. Osipowicz et al. (KATRIN coll.), hep-ex/0109033