Information for activation measurements at the NEAR Station

See below for the NEAR Station setup configurations.



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)



bpe30-27

This is a reference case. No in-beam moderator included. Scoring position is at the exit of the NEAR Station collimator. As for the other cases, the filter is nat B of indicated thickness (see table below).
BPE thickness [cm] moderator scoring position flux [n/cm2/pp] B filter thickness [cm] filtered flux [n/cm2/pp] full numerical printout
30 - 27 0.90179E+08 1.0 0.41429E+08 bpe30-27

bpe30-27-fluence.png
Neutron fluence for plain and Boron (1 cm) filtered beams
bpe30-27-framex.png
Comparison to a maxwellian spectrum and cumulative SACS
bpe30-27-framex-rebin.png
Comparison to a maxwellian spectrum and cumulative SACS (rebinned)
bpe30-27-evol.gif
Movie frames for different filter thickness grid
bpe30-27-rebin.gif
Movie frames for different filter thickness grid (rebinned)

bpe30-Al-small-27

In this case, an Al moderator placed in the internal part of the shielding. The size and shape of the moderator corresponds to the aperture of the collimator larger diameter.
BPE thickness [cm] moderator scoring position flux [n/cm2/pp] B filter thickness [cm] filtered flux [n/cm2/pp] full numerical printout
30 Al 27 0.17250E+09 1.0 0.88439E+08 bpe30-Al-small-27

bpe30-Al-small-27-fluence.png
Neutron fluence for plain and Boron (1 cm) filtered beams
bpe30-Al-small-27-framex.png
Comparison to a maxwellian spectrum and cumulative SACS
bpe30-Al-small-27-framex-rebin.png
Comparison to a maxwellian spectrum and cumulative SACS (rebinned)
bpe30-Al-small-27-evol.gif
Movie frames for different filter thickness grid

bpe30-Al-par-27

In addition to the Al moderator, a layer of borated polyethylene is included.
BPE thickness [cm] moderator scoring position flux [n/cm2/pp] B filter thickness [cm] filtered flux [n/cm2/pp] full numerical printout
30 Al 27 0.15071E+09 1.0 0.76362E+08 bpe30-Al-par-27

bpe30-Al-par-27-fluence.png
Neutron fluence for plain and Boron (1 cm) filtered beams
bpe30-Al-par-27-framex.png
Comparison to a maxwellian spectrum and cumulative SACS
bpe30-Al-par-27-framex-rebin.png
Comparison to a maxwellian spectrum and cumulative SACS (rebinned)
bpe30-Al-par-27-evol.gif
Movie frames for different filter thickness grid

bpe20-30

In this case, the scoring position is number 30 (inside the collimator hole). The BPE thickness is 20cm instead of 30cm. NOTE the extremely high neutron fluence, both for the direct as well as for the filtered beams.
BPE thickness [cm] moderator scoring position flux [n/cm2/pp] B filter thickness [cm] filtered flux [n/cm2/pp] full numerical printout
20 - 30 0.38609E+11 1.0 0.11913E+11 bpe20-30

bpe20-30-fluence.png
Neutron fluence for plain and Boron (1 cm) filtered beams
bpe20-30-framex.png
Comparison to a maxwellian spectrum and cumulative SACS
bpe20-30-framex-rebin.png
Comparison to a maxwellian spectrum and cumulative SACS (rebinned)
bpe20-30-evol.gif
Movie frames for different filter thickness grid

bpe30-Al-par-30

In addition to the Al moderator, a layer of borated polyethylene is included. Scoring place is inside the collimator.
BPE thickness [cm] moderator scoring position flux [n/cm2/pp] B filter thickness [cm] filtered flux [n/cm2/pp] full numerical printout
30 Al 27 0.45052E+11 1.0 0.15448E+11 bpe30-Al-par-30

bpe30-Al-par-30-fluence.png
Neutron fluence for plain and Boron (1 cm) filtered beams
bpe30-Al-par-30-framex.png
Comparison to a maxwellian spectrum and cumulative SACS
bpe30-Al-par-30-framex-rebin.png
Comparison to a maxwellian spectrum and cumulative SACS (rebinned)
bpe30-Al-par-30-evol.gif
Movie frames for different filter thickness grid

Pseudo-maxwellian temperatures vs Boron filter thickness

Comparison of the kT values derived from best-fit of the filtered spectra, for some of the setup configurations.

plot dkT.png
kT vs natB filter thickness

Integrated neutron flux

flux integrals.png
Integrated neutron fluence for selected configurations
flux integrals-comp.png
Integrated neutron fluence for selected configurations, in comparison with some other facility

Fluence units: n/cm2/proton-pulse

Setup configuration Total E < 1 keV 1 keV < E < 1 MeV E > 1 MeV
bpe30-27 0.90179E+08 0.15635E+08 0.45467E+08 0.29077E+08
bpe30-Al-par-27 0.15071E+09 0.19540E+08 0.83762E+08 0.47407E+08
bpe20-30 0.38609E+11 0.93307E+10 0.27541E+11 0.17376E+10
bpe30-Al-par-30 0.45052E+11 0.11164E+11 0.31238E+11 0.26503E+10


bpe30-Al-pool-27

Al moderator inside the target pool
BPE thickness [cm] moderator scoring position flux [n/cm2/pp] B filter thickness [cm] filtered flux [n/cm2/pp] full numerical printout
30 Al in pool 27 0.29497E+09 1.0 0.15483E+09 bpe30-Al-pool-27

41-bpe30-Al-pool-27-fluence.png
Neutron fluence for plain and Boron (1 cm) filtered beams
41-bpe30-Al-pool-27-framex.png
Comparison to a maxwellian spectrum and cumulative SACS
41-bpe30-Al-pool-27-framex-rebin.png
Comparison to a maxwellian spectrum and cumulative SACS (rebinned)
41-bpe30-Al-pool-27-evol.gif
Movie frames for different filter thickness grid

bpe30-Al-pool-30

Al moderator inside the target pool
BPE thickness [cm] moderator scoring position flux [n/cm2/pp] B filter thickness [cm] filtered flux [n/cm2/pp] full numerical printout
30 Al in pool 30 0.45848E+11 1.0 0.16248E+11 bpe30-Al-pool-30

42-bpe30-Al-pool-30-fluence.png
Neutron fluence for plain and Boron (1 cm) filtered beams
42-bpe30-Al-pool-30-framex.png
Comparison to a maxwellian spectrum and cumulative SACS
42-bpe30-Al-pool-30-framex-rebin.png
Comparison to a maxwellian spectrum and cumulative SACS (rebinned)
42-bpe30-Al-pool-30-evol.gif
Movie frames for different filter thickness grid

bpe30-Al-pool+Al-wall-27

Al moderator inside the target pool and attached to the shielding
BPE thickness [cm] moderator scoring position flux [n/cm2/pp] B filter thickness [cm] filtered flux [n/cm2/pp] full numerical printout
30 Al in pool + Al on shield 27 0.15242E+09 1.0 0.74404E+08 bpe30-Al-pool+Al-wall-27

43-bpe30-Al-pool+Al-wall-27-fluence.png
Neutron fluence for plain and Boron (1 cm) filtered beams
43-bpe30-Al-pool+Al-wall-27-framex.png
Comparison to a maxwellian spectrum and cumulative SACS
43-bpe30-Al-pool+Al-wall-27-framex-rebin.png
Comparison to a maxwellian spectrum and cumulative SACS (rebinned)
43-bpe30-Al-pool+Al-wall-27-evol.gif
Movie frames for different filter thickness grid

bpe30-Al-pool+Al-wall-30

Al moderator inside the target pool and attached to the shielding
BPE thickness [cm] moderator scoring position flux [n/cm2/pp] B filter thickness [cm] filtered flux [n/cm2/pp] full numerical printout
30 Al in pool + Al on shield 30 0.40632E+11 1.0 0.13920E+11 bpe30-Al-pool+Al-wall-30

44-bpe30-Al-pool+Al-wall-30-fluence.png
Neutron fluence for plain and Boron (1 cm) filtered beams
44-bpe30-Al-pool+Al-wall-30-framex.png
Comparison to a maxwellian spectrum and cumulative SACS
44-bpe30-Al-pool+Al-wall-30-framex-rebin.png
Comparison to a maxwellian spectrum and cumulative SACS (rebinned)
44-bpe30-Al-pool+Al-wall-30-evol.gif
Movie frames for different filter thickness grid

bpe30-Al-pool+Al-wall-31

Al moderator inside the target pool and attached to the shielding
BPE thickness [cm] moderator scoring position flux [n/cm2/pp] B filter thickness [cm] filtered flux [n/cm2/pp] full numerical printout
30 Al in pool + Al on shield 31 0.43984E+11 1.0 0.15390E+11 bpe30-Al-pool+Al-wall-31

45-bpe30-Al-pool+Al-wall-31-fluence.png
Neutron fluence for plain and Boron (1 cm) filtered beams
45-bpe30-Al-pool+Al-wall-31-framex.png
Comparison to a maxwellian spectrum and cumulative SACS
45-bpe30-Al-pool+Al-wall-31-framex-rebin.png
Comparison to a maxwellian spectrum and cumulative SACS (rebinned)
45-bpe30-Al-pool+Al-wall-31-evol.gif
Movie frames for different filter thickness grid


bpe30-Al8cm-PE1cm-pool-27

Al moderator inside the target pool
BPE thickness [cm] moderator scoring position flux [n/cm2/pp] B filter thickness [cm] filtered flux [n/cm2/pp] full numerical printout
30 Al(8cm) + PE(1cm) in pool 27 0.25981E+09 1.0 0.11907E+09 bpe30-Al8cm-PE1cm-pool-27

51-bpe30-Al8cm-PE1cm-pool-27-fluence.png
Neutron fluence for plain and Boron (1 cm) filtered beams
51-bpe30-Al8cm-PE1cm-pool-27-framex.png
Comparison to a maxwellian spectrum and cumulative SACS
51-bpe30-Al8cm-PE1cm-pool-27-framex-rebin.png
Comparison to a maxwellian spectrum and cumulative SACS (rebinned)
51-bpe30-Al8cm-PE1cm-pool-27-evol.gif
Movie frames for different filter thickness grid

bpe30-Al8cm-PE1cm-pool-30

Al moderator inside the target pool
BPE thickness [cm] moderator scoring position flux [n/cm2/pp] B filter thickness [cm] filtered flux [n/cm2/pp] full numerical printout
30 Al(8cm) + PE(1cm) in pool 30 0.43124E+11 1.0 0.13592E+11 bpe30-Al8cm-PE1cm-pool-30

52-bpe30-Al8cm-PE1cm-pool-30-fluence.png
Neutron fluence for plain and Boron (1 cm) filtered beams
52-bpe30-Al8cm-PE1cm-pool-30-framex.png
Comparison to a maxwellian spectrum and cumulative SACS
52-bpe30-Al8cm-PE1cm-pool-30-framex-rebin.png
Comparison to a maxwellian spectrum and cumulative SACS (rebinned)
52-bpe30-Al8cm-PE1cm-pool-30-evol.gif
Movie frames for different filter thickness grid

bpe30-Al8cm-PE1cm-pool-31

Al moderator inside the target pool
BPE thickness [cm] moderator scoring position flux [n/cm2/pp] B filter thickness [cm] filtered flux [n/cm2/pp] full numerical printout
30 Al(8cm) + PE(1cm) in pool 31 0.41986E+11 1.0 0.12843E+11 bpe30-Al8cm-PE1cm-pool-31

53-bpe30-Al8cm-PE1cm-pool-31-fluence.png
Neutron fluence for plain and Boron (1 cm) filtered beams
53-bpe30-Al8cm-PE1cm-pool-31-framex.png
Comparison to a maxwellian spectrum and cumulative SACS
53-bpe30-Al8cm-PE1cm-pool-31-framex-rebin.png
Comparison to a maxwellian spectrum and cumulative SACS (rebinned)
53-bpe30-Al8cm-PE1cm-pool-31-evol.gif
Movie frames for different filter thickness grid

bpe30-Al10cm-PE1cm-shield-27

Al moderator attached to the shielding
BPE thickness [cm] moderator scoring position flux [n/cm2/pp] B filter thickness [cm] filtered flux [n/cm2/pp] full numerical printout
30 Al(8cm) + PE(1cm) on shielding 27 0.13733E+09 1.0 0.68709E+08 bpe30-Al10cm-PE1cm-shield-27

54-bpe30-Al10cm-PE1cm-shield-27-fluence.png
Neutron fluence for plain and Boron (1 cm) filtered beams
54-bpe30-Al10cm-PE1cm-shield-27-framex.png
Comparison to a maxwellian spectrum and cumulative SACS
54-bpe30-Al10cm-PE1cm-shield-27-framex-rebin.png
Comparison to a maxwellian spectrum and cumulative SACS (rebinned)
54-bpe30-Al10cm-PE1cm-shield-27-evol.gif
Movie frames for different filter thickness grid

bpe30-Al10cm-PE1cm-shield-30

Al moderator attached to the shielding
BPE thickness [cm] moderator scoring position flux [n/cm2/pp] B filter thickness [cm] filtered flux [n/cm2/pp] full numerical printout
30 Al(8cm) + PE(1cm) on shielding 30 0.44143E+11 1.0 0.14364E+11 bpe30-Al10cm-PE1cm-shield-30

55-bpe30-Al10cm-PE1cm-shield-30-fluence.png
Neutron fluence for plain and Boron (1 cm) filtered beams
55-bpe30-Al10cm-PE1cm-shield-30-framex.png
Comparison to a maxwellian spectrum and cumulative SACS
55-bpe30-Al10cm-PE1cm-shield-30-framex-rebin.png
Comparison to a maxwellian spectrum and cumulative SACS (rebinned)
55-bpe30-Al10cm-PE1cm-shield-30-evol.gif
Movie frames for different filter thickness grid


setup Total flux [n/cm2/pp] E < 1 keV 1 keV < E < 1 MeV E > 1 MeV
bpe30-Al8cm-PE1cm-pool-27 2.5981e+08 4.0801e+07 1.5417e+08 6.4841e+07
bpe30-Al8cm-PE1cm-pool-30 4.3124e+10 1.2584e+10 2.7808e+10 2.7316e+09
bpe30-Al8cm-PE1cm-pool-31 4.1986e+10 1.4423e+10 2.4023e+10 3.5401e+09
bpe30-Al10cm-PE1cm-shield-27 1.3733e+08 1.9756e+07 7.1521e+07 4.6055e+07
bpe30-Al10cm-PE1cm-shield-30 4.4143e+10 1.1576e+10 2.9987e+10 2.5792e+09


plot integrals.png
Neutron fluence for the last five different configurations



-- AlbertoMengoni - 2020-03-06

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Topic revision: r9 - 2020-04-22 - AlbertoMengoni
 
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