Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 53: Poster – Instrumentation
HK 53.38: Poster
Donnerstag, 22. März 2012, 14:00–16:00, P Foyer
Design of a pulsed angular selective electron gun for the KATRIN main spectrometer — •Daniel Winzen, Volker Hannen, Hans-Werner Ortjohann, Michael Zacher, and Christian Weinheimer — Institut für Kernphysik, Westfälische Wilhelms-Universität, Münster
The KATRIN (KArlsruhe TRItium Neutrino mass) experiment will study the tritium β-spectrum near the endpoint of 18.6 keV, aiming to measure the mass of the electron antineutrino. Using an electrostatic retarding spectrometer (MAC-E-Filter), the projected sensitivity for mνe is 200 meV/c2 at 90% C.L..
In order to map out the electric and magnetic fields in the main spectrometer, an angular selective electron gun is currently being developed. The e-gun uses an UV-Laser to produce electrons via the photo-electric effect from a copper substrate
which are then accelerated electrostatically. It features a small energy spread of approx. 0.1 eV, a sharp emission angle and will be able to cover the whole magnetic flux tube of KATRIN.
Using a pulsed laser it is also possible to investigate the time of flight (TOF) of electrons through the spectrometer, offering enhanced sensitivity to spectrometer properties far away from the analysing plane.
By comparing information from transmission function measurements and TOF data with Monte Carlo simulations of the setup, one will be able to achieve a detailed understanding of the spectrometer properties.
This project is funded by the BMBF under contract number 05A11PM2.