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@INPROCEEDINGS{Li:906989,
author = {Li, Jingjing and Strothmann, Mathias and Zakalek, Paul and
Baggemann, Johannes and Gutberlet, Thomas and Brückel,
Thomas},
title = {{M}onte {C}arlo simulation of a mesitylene based cold
moderator system foraccelerator-driven compact neutron
sources},
reportid = {FZJ-2022-01801},
year = {2022},
abstract = {The organic compound mesitylene has been proposed as a
suitable material for cold neutron generationalongside
liquid ortho/para H2 and solid CH4 at cryogenic temperatures
because it has a high hydrogendensity, enables a safe
operation. To investigate the neutron moderation properties
of mesitylene andits potential application in the High
Brilliance Neutron Source (HBS) project, a mesitylene based
coldmoderator system was set up in the Big Karl experimental
hall at Forschungszentrum Jülich andperformed to determine
the cold neutron spectrum at different moderator
temperatures.In the experiment, primary neutrons are
generated by the Ta(p,xn )W reaction using a pulsed 45
MeVproton beam and further moderated by polyethylene thermal
moderator blocks. An extraction channelis built to gain the
neutrons from the thermal maximum, and the cold mesitylene
is placed in it. Themoderator vessel is a cylinder with a
diameter of 60 mm and a height of 30 mm. The
mesitylenemoderator system is cooled from 300 to 22 Kelvin
by a cold finger cryocooler in about two hours. andmoderates
the neutrons to a long wavelength of up to 40 Å. The
moderated neutrons were extractedvia the flat side of the
vessel and measured by TOF using a 7-meter neutron guide and
3He tubedetectors in TOF counter mode.Monte Carlo
simulations of this mesitylene based cold moderator system
were performed using theMCNP6.1 program package. The
geometry for the simulation is converted from the three
dimentionalCAD model of the experimental setup directly. The
neutron spectra at different mesitylenetemperatures were
calculated with respect to the gain of the cold neutrons
compared to a spectrum atroom temperature. A broadening and
shift of the cold moderator peaks to longer wavelengths
withdecreasing moderator temperature is observed in both
experimental data and simulation results. Whenthe mesitylene
temperature decreases from room temperature to 22 Kelvin,
the neutron spectrum peakshifts to a longer wavelength.
Mesitylene has proven to be a proper moderator material for
cryogenictemperatures around 20 K, which offers good
performance.},
month = {Mar},
date = {2022-03-28},
organization = {International Symposium UCANS9, online
by RIKEN, Japan (online event), 28 Mar
2022 - 31 Mar 2022},
cin = {JCNS-2 / PGI-4 / JARA-FIT / JCNS-HBS / ZEA-1},
cid = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
$I:(DE-82)080009_20140620$ / I:(DE-Juel1)JCNS-HBS-20180709 /
I:(DE-Juel1)ZEA-1-20090406},
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)1},
url = {https://juser.fz-juelich.de/record/906989},
}