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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},
}