Information for activation measurements at the NEAR Station

See below for the NEAR Station setup configurations.

Design example of collimator (from M Barbagallo's presentation)

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

Neutron fluence for plain and Boron (1 cm) filtered beams

Comparison to a maxwellian spectrum and cumulative SACS

Comparison to a maxwellian spectrum and cumulative SACS (rebinned)

Movie frames for different filter thickness grid

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

Neutron fluence for plain and Boron (1 cm) filtered beams

Comparison to a maxwellian spectrum and cumulative SACS

Comparison to a maxwellian spectrum and cumulative SACS (rebinned)

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

Neutron fluence for plain and Boron (1 cm) filtered beams

Comparison to a maxwellian spectrum and cumulative SACS

Comparison to a maxwellian spectrum and cumulative SACS (rebinned)

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

Neutron fluence for plain and Boron (1 cm) filtered beams

Comparison to a maxwellian spectrum and cumulative SACS

Comparison to a maxwellian spectrum and cumulative SACS (rebinned)

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

Neutron fluence for plain and Boron (1 cm) filtered beams

Comparison to a maxwellian spectrum and cumulative SACS

Comparison to a maxwellian spectrum and cumulative SACS (rebinned)

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.

Integrated neutron flux

Integrated neutron fluence for selected configurations

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

Neutron fluence for plain and Boron (1 cm) filtered beams

Comparison to a maxwellian spectrum and cumulative SACS

Comparison to a maxwellian spectrum and cumulative SACS (rebinned)

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

Neutron fluence for plain and Boron (1 cm) filtered beams

Comparison to a maxwellian spectrum and cumulative SACS

Comparison to a maxwellian spectrum and cumulative SACS (rebinned)

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

Neutron fluence for plain and Boron (1 cm) filtered beams

Comparison to a maxwellian spectrum and cumulative SACS

Comparison to a maxwellian spectrum and cumulative SACS (rebinned)

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

Neutron fluence for plain and Boron (1 cm) filtered beams

Comparison to a maxwellian spectrum and cumulative SACS

Comparison to a maxwellian spectrum and cumulative SACS (rebinned)

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

Neutron fluence for plain and Boron (1 cm) filtered beams

Comparison to a maxwellian spectrum and cumulative SACS

Comparison to a maxwellian spectrum and cumulative SACS (rebinned)

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

Neutron fluence for plain and Boron (1 cm) filtered beams

Comparison to a maxwellian spectrum and cumulative SACS

Comparison to a maxwellian spectrum and cumulative SACS (rebinned)

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

Neutron fluence for plain and Boron (1 cm) filtered beams

Comparison to a maxwellian spectrum and cumulative SACS

Comparison to a maxwellian spectrum and cumulative SACS (rebinned)

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

Neutron fluence for plain and Boron (1 cm) filtered beams

Comparison to a maxwellian spectrum and cumulative SACS

Comparison to a maxwellian spectrum and cumulative SACS (rebinned)

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

Neutron fluence for plain and Boron (1 cm) filtered beams

Comparison to a maxwellian spectrum and cumulative SACS

Comparison to a maxwellian spectrum and cumulative SACS (rebinned)

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

Neutron fluence for plain and Boron (1 cm) filtered beams

Comparison to a maxwellian spectrum and cumulative SACS

Comparison to a maxwellian spectrum and cumulative SACS (rebinned)

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

Neutron fluence for the last five different configurations

-- AlbertoMengoni - 2020-03-06