München 2006 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 52: Instrumentation und Anwendungen
HK 52.1: Vortrag
Donnerstag, 23. März 2006, 17:00–17:15, H
Design and optimization of the MAC-E-Filter of the neutron decay spectrometer aSPECT — •Raquel Muñoz Horta1, Heinz Angerer2, Fidel Ayala Guardia1, Stefan Baeßler1, Michael Borg1, Klaus Eberhardt3, Ferenc Glück1, Werner Heil1, Igor Konorov1, Gertrud Konrad2, Naika Luquero Llopis1, Marius Orlowski1, Gerd Petzoldt2, Dennis Rich4, Martin Simson2, Yuri Sobolev1, Hans-Friedrich Wirth2, and Oliver Zimmer2 — 1Institut für Physik, Universität Mainz — 2Physik Department E18, TU München — 3Institut für Kernchemie, Universität Mainz — 4Forschungsreaktor FRM-II, München
The aim of the spectrometer aSPECT is to measure an integrated proton spectrum from free neutron decay. This provides a value of the neutrino electron correlation coefficient a, obtaining information for a unitarity test of the Cabbibo-Kobayashi-Maskawa-Matrix. The design of the retardation spectrometer aSPECT is based on Magnetic Adiabatic Collimation followed by an Electrostatic Filter (MAC-E-Filter). With this system, protons produced in free neutron decay are guided towards the detector by magnetic field lines. On their way, they are adiabatically collimated, i.e. their momenta are aligned parallel to the field lines. Then, an electrostatic barrier is applied which allows only the protons with sufficient energy to pass and to be detected. By applying different voltages at the electrostatic barrier of the MAC-E-Filter one measures the integrated energy spectrum of the protons. The main working principle of the MAC-E-Filter, its implementation and its optimization in the aSPECT spectrometer are presented.