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标题：THE PHOTONEUTRON SOURCES AT THE RADIATION FACILITY ELBE
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作者：J. Klug ; E. Altstadt ; C. Beckert 等
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2006
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：The ELBE electron beam at Forschungszentrum Rossendorf, Dresden, with energies up to 40 MeV, will be used to produce intense neutron beams. The neutron radiator consists of a liquid lead circuit where bremsstrahlung photons created by the electrons produce neutrons in (γ,n) reactions. The short beam pulses (5 ps) provide the basis for an excellent time resolution for neutron time-of-flight experiments, giving an energy resolution of about 1 % with a flight path of 4 m. The neutron beam is shaped by a 2.4 m long collimator. The usable energy range is from 50 keV up to 10 MeV when ELBE delivers a beam repetition rate of 0.5 MHz. In this energy interval, there is a need for neutron cross section measurements relevant for the transmutation of minor actinides in nuclear waste, as well as for applications to fission and fusion reactors. The neutron flux at the sample position is 107 cm-2 s-1. Different detector types are being developed. For neutron capture γ rays, a BaF2 scintillation detector array of 42 crystals is being constructed, whereas for neutron detection, an up to 1 m2 large plastic scintillator wall consisting of 1 cm thick scintillation panels is being built.