ESS单片容器的设计和引入UCN/VCN源的可能性

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2022-10-21 DOI:10.3233/jnr-220014

U. Odén

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引用次数: 0

摘要

ESS ERIC中子源设计包括一个氦冷却的钨散裂靶和一个液氢慢化剂，封闭在一个真空容器中(单体容器-散裂源真空室)。中子源和慢化剂由不锈钢和铸铁屏蔽，以阻挡向中子导线以外方向发射的中子和伽马辐射。ESS概念设计获得批准后，讨论了是否有可能在ESS设计中引入UCN/VCN(超冷中子/极冷中子)源。由于整体容器的屏蔽概念是100%填充整体空隙，在质子和中子路径之外，整体容器中没有容易引入UCN/VCN源的空腔。此外，支持UCN/VCN冷却介质的管道路由也将挑战可能的UCN/VCN位置。然而，一些屏蔽块和整体组件是可拆卸的，可以重新设计，从而实现UCN/VCN源功能。本文对当前ESS设计中物理引入UCN/VCN源的可行性进行了研究，并重点讨论了几何上的可能性。本文确定并介绍了UCN/VCN源的四个可能位置。选址考虑了对现有设计的合理影响。讨论了利弊。所有提出的四个地点都是可行的，但在某种程度上，需要重新设计整体容器屏蔽。

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The ESS Monolith Vessel design and possibilities to introduce a UCN/VCN source

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 – spallation source vacuum chamber). The neutron source and moderator are shielded by stainless steel and casted iron to block neutron and gamma radiation emitted in directions outside of the neutron guide lines. After the ESS concept design was approved, discussions 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, outside of the proton and neutron path, there are no cavities in the monolith vessel to easily introduce an UCN/VCN source. In addition, pipe routing supporting the UCN/VCN cooling media, will also challenge the possible UCN/VCN positions. However, some of the shielding blocks and monolith components are removable and could possibly be redesigned, enabling a UCN/VCN source feature. The article presents a feasibility study how to physically introduce a UCN/VCN source in the present ESS design, and focus on the geometrical possibilities. Four possible locations for the UCN/VCN source are identified and presented in the article. The locations are selected considered reasonable impact to the existing design. Pros and cons are discussed. All of the four presented locations are feasible but will, to some extent, require redesign of the monolith vessel shielding.

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.