Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 81: Instrumentation
HK 81.7: Vortrag
Donnerstag, 7. März 2013, 18:30–18:45, WIL-A221
An angular selective electron gun for the KATRIN experiment — •Michael Zacher, Hans-Werner Ortjohann, Nicholas Steinbrink, Lorenz Josten, Volker Hannen, Christian Weinheimer, and Daniel Winzen — Westfälische Wilhelms-Universität, Münster
The KArlsruhe TRItium Neutrino experiment aims for a measurement of the electron anti-neutrino mass with a sensitivity of 200 meV/c2 (95% C.L.) by analysing the endpoint region of the tritium β-decay. The main spectrometer (MAC-E filter type, 23m length) is one of the central parts of the experiment, featuring an energy resolution of Δ E<1 eV. For commissioning of the spectrometer a well defined electron source is needed that allows to determine the transmission characteristics and compare the electromagnetic properties to simulations. For this purpose an angular selective electron gun was developed.
A pulsed UV-Laser produces electrons via the photo-electric effect, which are then accelerated electro-statically in a magnetic field. It features a small energy spread, a sharp selectable emission angle and covers the whole magnetic flux tube of KATRIN. By that, the characteristics of the spectrometer can be investigated with high precision. The time structure of the electron pulses allows time of flight measurements, offering enhanced sensitivity. The talk will give an overview about the e-gun design and its properties.
This project is funded by the BMBF under contract number 05A11PM2.