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Some experimental and simulation results on the grooved moderators and so on

This research explores grooved moderators for enhanced neutron intensity. It presents experimental data on single and multi-groove designs, energy spectrum measurements, and pulse shapes. The study includes simulations for comparing grooved and flat moderators, analyzing spatial neutron distributions, optimizing groove sizes, positions, and depths, and assessing intensity ratios. Results show enhanced thermal neutron intensity and pulse shapes with grooved moderators. The study also includes comparisons of neutron intensity distributions, pulse shapes, and energy spectra between different moderators, emphasizing the advantages of grooved designs for neutron moderation.

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Some experimental and simulation results on the grooved moderators and so on

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  1. Some experimental and simulation results on the grooved moderators and so on Y. Kiyanagi, Fujio Hiraga, Takashi Kamiyama （Supplement for previous talk form Hokkaiido University)

  2. Example of experimental data of a grooved moderator（Hydrogen moderator) Multi grooves Single groove

  3. Multi-grooves moderator assembly Energy spectrum measurement Experimental setup Pulse measurement

  4. Moderator assembly for a single groove moderator

  5. A coupled solid methane moderator with a groove • Optimization of size of a groove • Check experiments of neutron intensity distribution on the moderator surface • Simulation of pulse shapes and comparison with results of a flat moderator • Improvement of thermal neutron intensity

  6. Grooved Moderator and flat moderator Premoderator Premoderator Grooved Moderator Flat Moderator T Target Target T=50mm

  7. Geometry of the grooved moderator and its surroundings

  8. Comparison of the spatial distributions of neutrons on both moderator surfaces at various neutron energies L=15mm h=30mm d=50mm X=0mm

  9. Spatial distributions depending on the groove height h 2.2-4.4meV L=10mm W=80mm d=50mm X=0mm

  10. Spatial distributions of intensity ratios depending on the groove height h 2.2-4.4meV Ratio=Groove/Flat L=10mm W=80mm d=50mm X=0mm

  11. Spatial distribution depending on the groove position from the bottom h=30mm W=80mm d=50mm X=0mm

  12. Increase of neutron intensity as a function of groove height hat various distance of groove L W=80mm d=50mm X=0mm

  13. Increase of intensity as a function of groove depth d h=80mm L=3mm W=80mm X=0mm

  14. Optimum width of groove w h=80mm L=3mm d=70mm X=0mm

  15. Optimum target position h=80mm L=3mm d=70mm w=100mm

  16. Optimum size of a groove Height h=80 [mm] Distance from the bottom L= 3 [mm] Depth d=70 [mm] Width w= 100[mm] Target position x= 0 [mm]

  17. Comparison of spatial distribution with experimental results (cold)

  18. Comparison of spatial distribution with experimental results (thermal)

  19. Simulation of pulse shapes from a groove and from a corresponding area of a flat moderator

  20. Be filter-reflector

  21. Structure of Be filter-reflector hydrogen moderator chamber Al pieces Be piece Be folder

  22. Beam hole angle q Beam position ー ＋ H2O premoderator Graphite reflector Top view of the moderator assembly

  23. neutron intensity (arb. units) ○With Be ●Without Be Neutron energy (eV)

  24. Intensity ratio 　　　○　q=0 　　　●　q=30 （to Be）　Electorn beam positon (cm) （tomoderator）

  25. A Coupled Solid Mesitylene Moderator with a Single Groove

  26. Mesitylene is the best moderator among the non-explosive moderator material

  27. Comparison of spectra fromcoupledmoderators Methane Hydrogen(～normal) Our old data for reference Phase 1 Phase 3 Mesitylene Phase 1: slow cooling <2K/min Integrated intensity (0.8~5meV) 40% of Methane 44% of Hydrogen

  28. Comparison of energy spectra from decupled moderators

  29. Full width at half maximum of emission time 10 3 Mesitylene Hydrogen 10 2 Methane Methane Hydrogen 10 1 メシチレン Mesitylene 固体メタン 液体水素 10 0 1 10 100 Energy[meV] Comparison among decoupled moderators Pulse shape （3.3meV) FWHM of mesitylene is wider below 10 meV and almost the same above 10 meV compared with hydrogen (~normal). （Phase1data）

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