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HK: Fachverband Physik der Hadronen und Kerne
HK 3: Fundamentale Wechselwirkungen
HK 3.2: Talk
Monday, March 10, 2008, 14:30–14:45, 2B
Collimation of ultra-cold neutrons with diffuse channels — •Philipp Schmidt-Wellenburg1,2, Peter Geltenbort1, Jan Jakubek3, Valery Neshvizevsky1, Michal Platkevic3, Christian Plonka1, Torsten Soldner1, and Oliver Zimmer1,2 — 1Institut Laue Langevin, BP 156, 38042 Grenoble, France — 2Physik Department E18, Technische Universität München, 85748 Garching, Germany — 3Czech Technical University in Prague, Institute of Experimental and Applied Physics, CZ-12800 Prague 2 - Albertov, Horska 3a/22, Czech Republic
Semidiffuse and diffuse channels have been tested in the framework of the development of a dedicated ultra-cold neutron (UCN) source for the new gravitational spectormeter GRANIT at the ILL. In this talk we present first results of this method to extract a collimated beam of (UCN) from a storage vessel. Neutrons with too large divergence are not removed from the beam by an absorbing collimation, but a diffuse or semidiffuse channel with high Fermi potential reflects them back into the vessel. This avoids unnecessary losses and keeps the storage time high, which may be beneficial when the vessel is part of a UCN source with long buildup time of a high UCN density. A UCN detector with high spatial resolution was used for detection of the beam divergence.