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@INPROCEEDINGS{Violini:129121,
author = {Violini, Nicolo and Voigt, Jörg and Brückel, Thomas and
Nemkovskiy, Kirill and Russina, M. and Rolfs, K. and
Simeoni, G. and Lohstroh, W. and Silvi, L. and Deen, P.},
title = {{D}evelopment of a multi-spectral direct geometry chopper
spectrometer for the {E}uropean {S}pallation {S}ource},
reportid = {FZJ-2013-00641},
year = {2012},
abstract = {Within the ESS Design Update Phase Programme funded by the
German Federal ministry of education and research, we
investigate the performance of a set of spectrometer
concepts at the long pulse source of the ESS, which promises
the applicability to a wide manifold of scientific
activities of research: strongly correlated electron
materials, disordered systems, functional materials,
magnetism, soft-matter and biophysics. Here we present the
current state-of-the-art in the study of a multispectral
wide-band short (50-80m) instrument concept. We describe the
main aspects of the instrument conceptual design. The
chopper system is a crucial aspect in order to achieve
useful resolution for a manifold of scientific purposes,
make an efficient use of the flux provided by the source, by
means of the Repetition Rate Multiplication and reduce
contaminations due to very fast and very slow neutrons. We
present the chopper layout under investigation and the
method for the RRM implementation, based on the commensurate
choppers technique. The useful beam at the sample position
is an important figure of merit in the evaluation of the
instrument performance and can be a limit to possible
scientific applications in several circumstances, when high
flux is requested. The problem of the beam transport to the
sample is under consideration, in order to transport as much
as possible of the phase space density provided by the
source, maintaining as low as possible the back-ground
contamination coming from the direct view of the pulsed
source. A comparison on the estimated performance and
application limits of different guide geometries is
presented. Special consideration is dedicated to the aim of
focusing on very small sample size, down to the mm order of
magnitude. The technical implications of the polarization
analysis option are discussed. The necessary requirements
for the detector development in terms of spatial and time
resolution are already evaluated and the implications
deriving from technical limitations on this task are
discussed. Very preliminary results of virtual experiments
performed by means of beam neutron ray-trace simulation
packages are presented, in order to show the estimated
performance of such a concept, especially focusing on the
resolution function evaluation.},
month = {Apr},
date = {2012-04-19},
organization = {Science and Scientists @ ESS, Berlin
(Germany), 19 Apr 2012 - 20 Apr 2012},
subtyp = {Other},
cin = {ESS / JCNS-2 / PGI-4 / JCNS (München) ; Jülich Centre for
Neutron Science JCNS (München) ; JCNS-FRM-II / JCNS-1 /
ICS-1},
cid = {I:(DE-Juel1)VDB361 / I:(DE-Juel1)JCNS-2-20110106 /
I:(DE-Juel1)PGI-4-20110106 /
I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)ICS-1-20110106},
pnm = {451 - Soft Matter Composites (POF2-451) / 422 - Spin-based
and quantum information (POF2-422) / 424 - Exploratory
materials and phenomena (POF2-424) / 542 - Neutrons
(POF2-542) / 544 - In-house Research with PNI (POF2-544) /
54G - JCNS (POF2-54G24)},
pid = {G:(DE-HGF)POF2-451 / G:(DE-HGF)POF2-422 /
G:(DE-HGF)POF2-424 / G:(DE-HGF)POF2-542 / G:(DE-HGF)POF2-544
/ G:(DE-HGF)POF2-54G24},
typ = {PUB:(DE-HGF)24},
url = {https://juser.fz-juelich.de/record/129121},
}