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@PHDTHESIS{Rimmler:836357,
author = {Rimmler, Marius},
othercontributors = {Brückel, Thomas and Pretz, Jörg},
title = {{D}evelopment of a multiplexer system and measurement of
the neutron yield for a low-energy accelerator-driven
neutron source},
school = {RWTH Aachen University},
type = {Dissertation},
address = {Aachen},
publisher = {RWTH Aachen University},
reportid = {RWTH-2021-11262},
pages = {1 Online-Ressource : Illustrationen, Diagramme},
year = {2021},
note = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
University 2022; Dissertation, RWTH Aachen University, 2021},
abstract = {The High-Brilliance neutron Source (HBS) project aims at
developing a low-energy accelerator-driven neutron source
facility providing neutron beam brilliances at the
corresponding instruments, which are very competitive to
medium-flux fission-based research reactors. To obtain a
large beam brilliance at HBS, the full-fledged facility
simultaneously operates different neutron instruments, which
subdivide into three target stations, each efficiently
operated to supply different neutron pulse structures. This
will be realized by generating an interlaced proton pulse
structure containing three different proton beam timing
schemes, which are then distributed to the individual target
stations. The distribution of the different proton pulse
sequences to the target stations is performed by a proton
beam multiplexer system which is developed in the frame of
this thesis. A test setup of this multiplexer system, which
primarily consists of a kicker and a septum magnet, is
developed at the 45 MeV proton accelerator facility JULIC of
Forschungszentrum Jülich GmbH. Here, the main focus is on
the development of a new type of permanent-magnet-based
septum magnet featuring three different magnetic dipole
field regions in close proximity. The design process of such
a septum magnet is presented in detail together with the
analysis of a prototype based on the corresponding magnet
technology. Furthermore, proton pulse distribution is
demonstrated with the operation of the kicker magnet of the
multiplexer test setup being synchronized to the proton beam
chopper of JULIC. The integration of the multiplexer system
at HBS is described thoroughly including the design of a
septum magnet based on the developments at JULIC and scaled
to serve the larger proton beam energy of 70 MeV. In the
context of the HBS multiplexer system, the HBS High-Energy
Beam Transport (HEBT) beamline is designed and associated
beam-dynamics calculations are carried out. The effect of
the field quality of the HBS septum magnet on the
transmission through the HEBT is investigated by particle
tracking studies. In addition, another contribution to the
maximization of the neutron beam brilliance at HBS is made
by measurements of the neutron yield for different target
materials applicable at low-energy accelerator-driven
neutron sources in the proton energy range of 22-42 MeV. The
measurement technique is based on the analysis of the 2.2
MeV prompt gamma line induced by thermal neutron capture in
the hydrogen nuclei of a polyethylene moderator. The
experimental results are used to benchmark the results
obtained from numerical simulations and extrapolated to 70
MeV, which helps selecting the appropriate target material
at HBS providing the largest proton-energy-dependent neutron
yield and thus neutron beam brilliance.},
cin = {134310 / 130000},
ddc = {530},
cid = {$I:(DE-82)134310_20140620$ / $I:(DE-82)130000_20140620$},
typ = {PUB:(DE-HGF)11},
doi = {10.18154/RWTH-2021-11262},
url = {https://publications.rwth-aachen.de/record/836357},
}
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