München 2006 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 21: Postersitzung
HK 21.57: Poster
Dienstag, 21. März 2006, 15:30–17:00, P
Evaluation of the transmission properties of the neutron guides for the UCN — •Igor Altarev1, Peter Eger1, Andreas Frei1, Erwin Gutsmiedl1, F. Joachim Hartmann1, Axel R. Müller1, Stephan Paul1, Wolfgang Schmid1, Daniele Tortorella1, Peter Geltenbort2, and Christian Plonka2 — 1Physik-Department, Technische Universität München, James Frank Strasse, Garching D-85747, Germany — 2Institut Laue-Langevin, 6 rue Jules Horowitz BP 156, 38042 Grenoble Cedex 9, France
Investigating transmission properties of ultra-cold neutron guides is motivated by the barest necessity to develop an appropriate UCN tube with excellent guiding properties for the very promising planned source of UCN at the FRM-II reactor in Munich, which was put into operation recently. A relevant method has been developed as an extension of the common technique for measuring of UCN losses in the sample contained between two diaphragms. With two measurements at both ends of the guide one can evaluate both the loss probability per wall collision and the probability for diffuse scattering from the wall. The various tubes made of aluminum or stainless steel and with different surface roughness will be inside coated with beryllium or stainless steel or beryllium on stainless steel. We present the first results which approve the method and indicate a severe problem with the coated unpolished aluminum tubes. (This work was supported by DFG and Meier-Leibnitz Laboratory)