Physics – Instrumentation and Detectors
Scientific paper
2010-11-29
JINST 6:P01002,2011
Physics
Instrumentation and Detectors
16 pages, 11 figures
Scientific paper
10.1088/1748-0221/6/01/P01002
The method of direct neutrino mass determination based on the kinematics of tritium beta decay, which is adopted by the KATRIN experiment, makes use of a large, high-resolution electrostatic spectrometer with magnetic adiabatic collimation. In order to target a sensitivity on the neutrino mass of 0.2 eV/c^2, a detailed understanding of the electromagnetic properties of the electron spectrometer is essential, requiring comprehensive calibration measurements with dedicated electron sources. In this paper we report on a prototype of a photoelectron source providing a narrow energy spread and angular selectivity. Both are key properties for the characterisation of the spectrometer. The angular selectivity is achieved by applying non-parallel strong electric and magnetic fields: Directly after being created, photoelectrons are accelerated rapidly and non-adiabatically by a strong electric field before adiabatic magnetic guiding takes over.
Baumeister Harald
Beck Matthias
Bokeloh K.
Bonn Jochen
Glück F.
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