Concepts of UCN sources for the FRM-II

U. Trinks, F. J. Hartmann, S. Paul, W. Schott

Research output: Contribution to journalConference articlepeer-review

51 Scopus citations


Three concepts for sources of ultra-cold neutrons (UCN) for the reactor FRM-II at Garching near Munich are studied: one, Mini-D2, is a source with 170 cm3 of solid deuterium in the beam tube SR4 and the second one a large solid-deuterium source (volume about 30 dm3), mounted in the beam tube SR5 as an advanced cold source with a number of neutron guides. The third one, Mark 3000, uses superfluid 4He at a cold-neutron guide. A UCN density of up to 7×104 cm-3 may possibly be achieved in the storage volumes of Mini-D2 yielding more than 109 UCN for extraction to an attached experimental setup. The usable UCN flux at the periphery of the large deuterium source is predicted to be 2×107 cm-2 s-1. Mark 3000, finally, is expected to yield a UCN density of about 105 cm-3.

Original languageEnglish
Pages (from-to)666-673
Number of pages8
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number3
StatePublished - Jun 2000
Externally publishedYes
EventThe International Workshop on 'Particle Physics with Slow Neutrons' - Grenoble, France
Duration: 22 Oct 199824 Oct 1998


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