Münster 2002 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 7: Instrumentation and Applications I
HK 7.1: Group Report
Monday, March 11, 2002, 16:15–16:45, F
The source for ultra-cold neutrons at the research neutron facility FRM-II — •F. Joachim Hartmann, Igor Altarev, Andreas Frei, Stephan Gröger, Stephan Paul, Gerd Petzoldt, Wolfgang Schott, Uwe Trinks, and Oliver Zimmer — Physik-Department, Technische Universität München
A source for ultra-cold neutrons (UCN) with solid deuterium is planned for the new Munich high-flux neutron source FRM-II. Ultra-cold neutrons have energies below about 250 neV and may be stored in vessels, magnetic bottles and by gravity. The new source, Mini-D2, will be installed in beam tube SR-4 of FRM-II. It consists of a so-called converter, about 170 cm3 of solid deuterium at a temperature of 5 K, and the storage volume, an evacuated tube of 6 cm diameter and about 8 m length. The walls of the storage tube will be coated with Be. The converter is located inside the storage volume very close to the Cold Source of FRM-II. From model calculations we may expect that in pulsed mode the source will produce UCN densities of about 104 cm−3, by far more than the world’s best sources existing up to now. This enhancement in density will allow to measure important properties of the free neutron like the electric dipole moment or the lifetime with strongly improved precision. The layout of the source and the first experiment planned, the magnetic confinement of UCN, will be presented.