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@INPROCEEDINGS{Chen:1017356,
author = {Chen, Junyang and Voigt, Jörg and Vezhlev, Egor and
Zakalek, Paul and Rücker, Ulrich and Li, Jingjing and
Gutberlet, Thomas and Brückel, Thomas},
title = {{I}nvestigation of {P}ancake-like {M}oderator-{R}eflector
{S}tructure for the {H}igh {B}rilliance {N}eutron {S}ource
({HBS})},
reportid = {FZJ-2023-04066},
year = {2023},
abstract = {The High Brilliance Neutron Source (HBS) project is
developing a high-current accelerator-driven neutron source
(HiCANS) to maintain a healthy neutron landscape in Europe.
Despite the lower primary neutron yield of the nuclear
reactions compared to reactor or spallation neutron sources,
HiCANS achieve a competitive neutron brightness by a compact
moderator and reflector design, which makes a large fraction
of the primary neutron spectrum available for applications.
The spectral and temporal, i.e. frequency and pulse length,
characteristics of the neutron pulse are tailored to the
instruments hosted at a target station.Based on the
‘pancake’ and ‘butterfly’ moderator geometries
developed for the European Spallation Source (ESS), we
investigate a pancake-like structure by means of Monte Carlo
simulations involving multi-parameter optimization routines.
By increasing the interface area, we try to improve the
coupling between thermal and cryogenic moderator. The
extraction surfaces of the applied pancake-like geometry
achieve a cold neutron flux of $85\%-87\%$ of a cylindrical
para H2 moderator (length= 10 cm, diameter = 2.4 cm) with
ideal coupling. The flux through the thermal extraction
surfaces reaches $70\%-79\%$ in comparison to an ideal case
with just a single extraction channel looking at the thermal
flux maximum in the center of the thermal moderator. The
optimized structure with up to six extraction channels looks
therefore very promising for target stations that serve a
large number of thermal and cold instruments. At this
conference, we will present the results of our study of this
moderator-reflector assembly. [1] X. Y. Author, Neutron
News, 22, 7 (2011)},
month = {Oct},
date = {2023-10-16},
organization = {10th Annual Meeting of the Union for
Compact Accelerator-driven Neutron
Sources, Budapest (Hungary), 16 Oct
2023 - 19 Oct 2023},
subtyp = {Invited},
cin = {JCNS-2 / PGI-4 / JCNS-HBS / JARA-FIT / JCNS-FRM-II},
cid = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
I:(DE-Juel1)JCNS-HBS-20180709 / $I:(DE-82)080009_20140620$ /
I:(DE-Juel1)JCNS-FRM-II-20110218},
pnm = {632 - Materials – Quantum, Complex and Functional
Materials (POF4-632) / 6G4 - Jülich Centre for Neutron
Research (JCNS) (FZJ) (POF4-6G4)},
pid = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G4},
typ = {PUB:(DE-HGF)24},
url = {https://juser.fz-juelich.de/record/1017356},
}