Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 53: Poster – Instrumentation
HK 53.32: Poster
Donnerstag, 22. März 2012, 14:00–16:00, P Foyer
Design of a Condensed Krypton Source (CKrS) at the cryo-pumping section of KATRIN — Stephan Bauer, Richard Bottesch, •Benjamin Grees, Daniel Spitzer, and C. Weinheimer — Institut für Kernphysik, Universität Münster
The KArlsruhe TRItium Neutrino experiment will measure the endpoint of the tritium-β-spectrum by means of an electrostatic retarding spectrometer (MAC-E-Filter), which will allow determination of the mass of the νe with 200meV/c2 sensitivity (90% C.L.). To achieve this, it is necessary to monitor the retarding voltage of the spectrometer with 3ppm precision, which is realized using a combination of a high voltage divider and a monoenergetic source of conversion electrons (83mKr). For this purpose, a condensed Krypton source (CKrS) will be installed at the Cryogenic Pumping Section (CPS) of the KATRIN experiment. The CKrS will be mounted on an UHV manipulator to be able to scan the whole flux tube of KATRIN. To control the thickness of the condensed gas in the source, a specialized ellipsometry setup with analyser and detector in the vacuum has been developed. Another upgrade to the CKrS is the installation of an ablation laser, to remove residual gas contaminations from the substrate. This project is funded by the BMBF under contract number 05A11PM2.