Summary of simulation results at the NEAR Station (February 2021)

Collimator design example.png
Design example of collimator (from M Barbagallo's presentation)

NEAR Station scoring positions.png
NEAR station scoring positions (from M Barbagallo's presentation)



NOTE ID from 81 to 86 are for scoring position 27, 91 to 96 are for scoring position 30.

Filters

Filter material in all cases : Boron enriched (95% B-10 and 5% B-11)
Density : 2.46 g/cm3 (0.137 atoms/b for 1.0 cm thickness)
Filter thickness grid [cm] : 0.0   0.1   0.2   0.3   0.4   0.5   0.6   0.7   0.8   0.9   1.0   1.1   1.2   1.3   1.4   1.5   2.0   2.5   3.0   3.5   4.0   4.5   5.0  

M81: No-moderator

no moderator
ID BPE thickness [cm] moderator scoring position flux [n/cm2/pp] filter type filter thickness [cm] filtered flux [n/cm2/pp] full numerical printout input nspectrum file
M81 30 - 27 0.39641E+09 Boron (enriched) 1.0 0.23005E+09 No-moderator M81-input-nspectrum

M81-No-moderator-fluence.png
Neutron flux for plain and filtered (1 cm thickness) beams
M81-No-moderator-framex.png
Comparison to a maxwellian spectrum and cumulative SACS
M81-No-moderator-evol.gif
Movie frames for different the filter thickness grid
M81-plot-syst-norm-eo.png
Systematics of M-SACS/NS-SACS

M82: Shelf-position-light

moderator on the shelf, 25 kg
ID BPE thickness [cm] moderator scoring position flux [n/cm2/pp] filter type filter thickness [cm] filtered flux [n/cm2/pp] full numerical printout input nspectrum file
M82 30 AlF3 27 0.13209E+09 Boron (enriched) 1.0 0.67803E+08 Shelf-position-light M82-input-nspectrum

M82-Shelf-position-light-fluence.png
Neutron flux for plain and filtered (1 cm thickness) beams
M82-Shelf-position-light-framex.png
Comparison to a maxwellian spectrum and cumulative SACS
M82-Shelf-position-light-evol.gif
Movie frames for different the filter thickness grid
M82-plot-syst-norm-eo.png
Systematics of M-SACS/NS-SACS

M83: Shelf-position-heavy

moderator on the shelf, 40 kg
ID BPE thickness [cm] moderator scoring position flux [n/cm2/pp] filter type filter thickness [cm] filtered flux [n/cm2/pp] full numerical printout input nspectrum file
M83 30 AlF3 27 0.92037E+08 Boron (enriched) 1.0 0.42348E+08 Shelf-position-heavy M83-input-nspectrum

M83-Shelf-position-heavy-fluence.png
Neutron flux for plain and filtered (1 cm thickness) beams
M83-Shelf-position-heavy-framex.png
Comparison to a maxwellian spectrum and cumulative SACS
M83-Shelf-position-heavy-evol.gif
Movie frames for different the filter thickness grid
M83-plot-syst-norm-eo.png
Systematics of M-SACS/NS-SACS

M84: Al-moderator

pure Aluminum moderator, 40 kg
ID BPE thickness [cm] moderator scoring position flux [n/cm2/pp] filter type filter thickness [cm] filtered flux [n/cm2/pp] full numerical printout input nspectrum file
M84 30 Al 27 0.12942E+09 Boron (enriched) 1.0 0.65966E+08 Al-moderator M84-input-nspectrum

M84-Al-moderator-fluence.png
Neutron flux for plain and filtered (1 cm thickness) beams
M84-Al-moderator-framex.png
Comparison to a maxwellian spectrum and cumulative SACS
M84-Al-moderator-evol.gif
Movie frames for different the filter thickness grid
M84-plot-syst-norm-eo.png
Systematics of M-SACS/NS-SACS

M85: AlF3+BPE-moderator

AlF3(10cm) + BPE(10cm) moderator, 40 kg
ID BPE thickness [cm] moderator scoring position flux [n/cm2/pp] filter type filter thickness [cm] filtered flux [n/cm2/pp] full numerical printout input nspectrum file
M85 30 AlF3+BPE 27 0.52383E+08 Boron (enriched) 1.0 0.24307E+08 AlF3+BPE-moderator M85-input-nspectrum

M85-AlF3+BPE-moderator-fluence.png
Neutron flux for plain and filtered (1 cm thickness) beams
M85-AlF3+BPE-moderator-framex.png
Comparison to a maxwellian spectrum and cumulative SACS
M85-AlF3+BPE-moderator-evol.gif
Movie frames for different the filter thickness grid
M85-plot-syst-norm-eo.png
Systematics of M-SACS/NS-SACS

M86: Al+BPE-moderator

Al(10cm) + BPE(10cm) moderator, 40 kg
ID BPE thickness [cm] moderator scoring position flux [n/cm2/pp] filter type filter thickness [cm] filtered flux [n/cm2/pp] full numerical printout input nspectrum file
M86 30 Al+BPE 27 0.53485E+08 Boron (enriched) 1.0 0.25987E+08 Al+BPE-moderator M86-input-nspectrum

M86-Al+BPE-moderator-fluence.png
Neutron flux for plain and filtered (1 cm thickness) beams
M86-Al+BPE-moderator-framex.png
Comparison to a maxwellian spectrum and cumulative SACS
M86-Al+BPE-moderator-evol.gif
Movie frames for different the filter thickness grid
M86-plot-syst-norm-eo.png
Systematics of M-SACS/NS-SACS

M91: No-moderator

no moderator
ID BPE thickness [cm] moderator scoring position flux [n/cm2/pp] filter type filter thickness [cm] filtered flux [n/cm2/pp] full numerical printout input nspectrum file
M91 30 - 30 0.55493E+11 Boron (enriched) 1.0 0.22471E+11 No-moderator M91-input-nspectrum

M91-No-moderator-fluence.png
Neutron flux for plain and filtered (1 cm thickness) beams
M91-No-moderator-framex.png
Comparison to a maxwellian spectrum and cumulative SACS
M91-No-moderator-evol.gif
Movie frames for different the filter thickness grid

M92: Shelf-position-light

moderator on the shelf, 25 kg
ID BPE thickness [cm] moderator scoring position flux [n/cm2/pp] filter type filter thickness [cm] filtered flux [n/cm2/pp] full numerical printout input nspectrum file
M92 30 AlF3 30 0.42160E+11 Boron (enriched) 1.0 0.15011E+11 Shelf-position-light M92-input-nspectrum

M92-Shelf-position-light-fluence.png
Neutron flux for plain and filtered (1 cm thickness) beams
M92-Shelf-position-light-framex.png
Comparison to a maxwellian spectrum and cumulative SACS
M92-Shelf-position-light-evol.gif
Movie frames for different the filter thickness grid

M93: Shelf-position-heavy

moderator on the shelf, 40 kg
ID BPE thickness [cm] moderator scoring position flux [n/cm2/pp] filter type filter thickness [cm] filtered flux [n/cm2/pp] full numerical printout input nspectrum file
M93 30 AlF3 30 0.38898E+11 Boron (enriched) 1.0 0.13204E+11 Shelf-position-heavy M93-input-nspectrum

M93-Shelf-position-heavy-fluence.png
Neutron flux for plain and filtered (1 cm thickness) beams
M93-Shelf-position-heavy-framex.png
Comparison to a maxwellian spectrum and cumulative SACS
M93-Shelf-position-heavy-evol.gif
Movie frames for different the filter thickness grid

M94: Al-moderator

pure Aluminum moderator, 40 kg
ID BPE thickness [cm] moderator scoring position flux [n/cm2/pp] filter type filter thickness [cm] filtered flux [n/cm2/pp] full numerical printout input nspectrum file
M94 30 Al 30 0.41498E+11 Boron (enriched) 1.0 0.14831E+11 Al-moderator M94-input-nspectrum

M94-Al-moderator-fluence.png
Neutron flux for plain and filtered (1 cm thickness) beams
M94-Al-moderator-framex.png
Comparison to a maxwellian spectrum and cumulative SACS
M94-Al-moderator-evol.gif
Movie frames for different the filter thickness grid

M95: AlF3+BPE-moderator

AlF3(10cm) + BPE(10cm) moderator, 40 kg
ID BPE thickness [cm] moderator scoring position flux [n/cm2/pp] filter type filter thickness [cm] filtered flux [n/cm2/pp] full numerical printout input nspectrum file
M95 30 AlF3+BPE 30 0.33209E+11 Boron (enriched) 1.0 0.11071E+11 AlF3+BPE-moderator M95-input-nspectrum

M95-AlF3+BPE-moderator-fluence.png
Neutron flux for plain and filtered (1 cm thickness) beams
M95-AlF3+BPE-moderator-framex.png
Comparison to a maxwellian spectrum and cumulative SACS
M95-AlF3+BPE-moderator-evol.gif
Movie frames for different the filter thickness grid

M96: Al+BPE-moderator

Al(10cm) + BPE(10cm) moderator, 40 kg
ID BPE thickness [cm] moderator scoring position flux [n/cm2/pp] filter type filter thickness [cm] filtered flux [n/cm2/pp] full numerical printout input nspectrum file
M96 30 Al+BPE 30 0.33646E+11 Boron (enriched) 1.0 0.11356E+11 Al+BPE-moderator M96-input-nspectrum

M96-Al+BPE-moderator-fluence.png
Neutron flux for plain and filtered (1 cm thickness) beams
M96-Al+BPE-moderator-framex.png
Comparison to a maxwellian spectrum and cumulative SACS
M96-Al+BPE-moderator-evol.gif
Movie frames for different the filter thickness grid

Fit goodness

A quantitave comparison between the filtered spectrum and a pure maxwelling spectrum can be provided by the overlap betwwn the two curves. The maxwellian spectrum area is usually smaller th an the filtered spectrum. In the figure below, the overlap is shown as a function of the filter thickness for all the configurations considered here.

plot fitoverlap.png


Integrated Flux (unfiltered)

ID setup Total [n/cm2/pp] E < 1 keV 1 keV < E < 1 MeV E > 1 MeV
M81 No-moderator 3.9641e+08 1.9301e+07 2.4557e+08 1.3154e+08
M82 Shelf-position-light 1.3209e+08 1.5372e+07 7.5527e+07 4.1196e+07
M83 Shelf-position-heavy 9.2037e+07 1.4823e+07 5.2430e+07 2.4785e+07
M84 Al-moderator 1.2942e+08 1.5303e+07 7.8492e+07 3.5620e+07
M85 AlF3+BPE-moderator 5.2383e+07 1.1219e+07 2.3923e+07 1.7241e+07
M86 Al+BPE-moderator 5.3485e+07 1.1024e+07 2.2937e+07 1.9524e+07
M91 No-moderator 5.5493e+10 1.0668e+10 3.9751e+10 5.0741e+09
M92 Shelf-position-light 4.2160e+10 1.0467e+10 2.8952e+10 2.7411e+09
M93 Shelf-position-heavy 3.8898e+10 1.0394e+10 2.6325e+10 2.1788e+09
M94 Al-moderator 4.1498e+10 1.0316e+10 2.8619e+10 2.5626e+09
M95 AlF3+BPE-moderator 3.3209e+10 9.4801e+09 2.1899e+10 1.8291e+09
M96 Al+BPE-moderator 3.3646e+10 9.4573e+09 2.2271e+10 1.9183e+09



-- AlbertoMengoni - 2021-02-19

Edit | Attach | Watch | Print version | History: r7 < r6 < r5 < r4 < r3 | Backlinks | Raw View | WYSIWYG | More topic actions
Topic revision: r7 - 2021-06-04 - AlbertoMengoni
 
    • Cern Search Icon Cern Search
    • TWiki Search Icon TWiki Search
    • Google Search Icon Google Search

    NTOFPublic All webs login

This site is powered by the TWiki collaboration platform Powered by PerlCopyright & 2008-2023 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
or Ideas, requests, problems regarding TWiki? use Discourse or Send feedback