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Berlin 2005 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 21: Instrumentation und Anwendungen

HK 21.2: Talk

Monday, March 7, 2005, 14:30–14:45, TU MA042

The New Source of Ultra Cold Neutrons at PSI — •Axel Pichlmaier1, M. Daum1, F. Atchison1, K. Bodek2, B. van den Brandt1, T. Brys1, P. Fierlinger1, P. Geltenbort3, W. Gloor1, P. Hautle1, G. Heidenreich1, R. Henneck1, St. Joray1, K. Kirch1, S. Kistryn2, K. Kohlik1, J. A. Konter1, G. Kühne1, S. Mango1, H. Obermaier1, Ch. Perret1, U. Rohrer1, H. J. Temnitzer1, H. Zmeskal4, and G. Szigmond11Paul Scherrer Institut, Villigen, Switzerland — 2Jagellonian University, Cracow, Poland — 3Institut Laue Langevin, Grenoble, France — 4Österreichische Akademie der Wissenschaften, Vienna, Austria

Ultra-cold neutrons (UCN) are used, among others, for precision measurements in particle physics. Experiments are often crippled by statistical limitations. A new high intensity source of UCN is currently being built at PSI. It uses the full intensity proton beam of the PSI ring cyclotron (2 mA, 590 MeV) in macro pulses of a few seconds length. Spallation neutrons are produced on a heavy metal target, thermalized in heavy water and finally down scattered into UCN in solid D2. The UCN are extracted into a storage volume from where neutron guides lead to experiments. We expect UCN densities of up to 4000 cm−3 in the storage tank, an improvement of about two orders of magnitude compared to the only UCN source in operation now. The primary aim for the new source is to provide UCN for a new precision search for a neutron electric dipole moment. Other applications include neutron lifetime measurements or a phase space transformer to produce a high intensity beam of cold neutrons.

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