The cold neutron source in DR3

K. Jensen, J.A. Leth

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    A description of the cold neutron source in DR 3 is given. The moderator of the cold neutron source is supercritical hydrogen at about 30°K and 15 bar abs. The necessary cooling capacity is supplied by two Philips Stirling B20 cryogenerators. The hydrogen is circulated between the cryogenerators and the in-pile moderator chamber by small fans. The safety of the facility is based on the use of triple containment preventing contact between hydrogen and air. The triple containment is achieved by enclosing the high vacuum system, surrounding the hydrogen system, in a helium blanket.

    The achieved spectrum of the thermal neutron flux and the gain factor are given as well as the experience from more than 5 years of operation.

    Finally some work on extension of the facility to operate two cold sources is reported.
    Original languageEnglish
    Place of PublicationRoskilde, Denmark
    PublisherRisø National Laboratory
    Number of pages35
    ISBN (Print)87-550-0708-2
    Publication statusPublished - 1980


    • Risø-M-2246
    • Cold Neutrons
    • Dr 3 reactor
    • Gases
    • Hydrogen
    • Neutron flux
    • Neutron sources
    • Operation
    • Safety
    • Specifications

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