Optimization of moderators and beam extraction at the ESS

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F18%3A00489155" target="_blank" >RIV/61389005:_____/18:00489155 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1107/S1600576718002406" target="_blank" >http://dx.doi.org/10.1107/S1600576718002406</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1107/S1600576718002406" target="_blank" >10.1107/S1600576718002406</a>

Result language

angličtina

Original language name

Optimization of moderators and beam extraction at the ESS

Original language description

A global approach coupling the moderator to the beam extraction system has been applied for the design optimization of the thermal and cold moderators of the European Spallation Source (ESS), which will be the brightest neutron source in the world for condensed-matter studies. The design is based on the recently developed high-brightness low-dimensional moderator concepts. Para-hydrogen is used for the cold neutron source, while thermal neutrons are provided by moderation in water. The overall moderation configuration was chosen in order to satisfy a range of requirements on bispectral extraction, beamport configuration and instrument performance. All instruments are served by a single moderator assembly above the target, arranged in a `butterfly' geometry with a height of 3cm. This was determined to be the optimal height for trade-off between high brightness and efficient guide illumination, by analysis of the performance of 23 instruments, based on the reference suite of the ESS Technical Design Report. The concept of `brilliance transfer' is introduced to quantify the performance of the neutron optical system from the source to the sample. The target monolith incorporates a grid of 42 neutron beamports with an average separation of 6 degrees, allowing a free choice between cold and thermal neutron sources at all instrument positions. With the large number of beamports and the space below the target available for future moderators, ample opportunities are available for future upgrades.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project

<a href="/en/project/LM2015048" target="_blank" >LM2015048: European Spallation Source – participation of the Czech Republic</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Applied Crystallography

ISSN

1600-5767

e-ISSN

—

Volume of the periodical

51

Issue of the periodical within the volume

4

Country of publishing house

GB - UNITED KINGDOM

Number of pages

18

Pages from-to

264-281

UT code for WoS article

000429090100006

EID of the result in the Scopus database

2-s2.0-85045064847