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The ESS monolith vessel design and possibilities to introduce a UCN/VCN source

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  • Ulf Odén

Abstract

The ESS ERIC neutron source design includes a helium cooled tungsten spallation target and a liquid hydrogen moderator, enclosed in a vacuum vessel (the monolith vessel). The neutron source and moderator are shielded by stainless steel and casted iron to block neutron and gamma radiation emitted in directions other than along the neutron beam ports. After the ESS concept design was approved, questions were raised if it was possible to introduce a UCN/VCN (Ultra Cold Neutron/Very Cold Neutron) source into the ESS design. Since the shielding concept of the monolith vessel is to 100% fill the monolith void except for the proton and neutron beam paths, there are no cavities in the monolith vessel left, where one could easily place a UCN/VCN source. An additional challenge is the pipe routing for the UCN/VCN cooling media. However, some of the shielding blocks and monolith components are removable and could possibly be redesigned, enabling implementation of a UCN/VCN source. This article presents a feasibility study how to physically introduce a UCN/VCN source in the present ESS design, focusing on the geometrical possibilities. Four possible locations for the UCN/VCN source were identified, which are considered to be feasible but will require some redesign of the monolith vessel shielding.

Suggested Citation

  • Ulf Odén, 2022. "The ESS monolith vessel design and possibilities to introduce a UCN/VCN source," Jadavpur Journal of International Relations, , vol. 24(2), pages 229-237, September.
    • Handle: RePEc:sae:jadint:v:24:y:2022:i:2:p:229-237
    DOI: 10.3233/JNR-220014
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