activation studies on benefit of the selection of the ess target concept

D. Ene. M. P. W. Chin. C. Kharoua. E. Noah. F. Plewinski

ESSS-AB. Stora Algatan 4. Lund. Sweden

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-Development of a method to be used for residual field estimation for target and its surroundings. Selection of the appropriate approach for the optimized model estimates.

-Rough estimates for order of magnitude evaluations. Global amounts are analyzed.

-Investigation of the influence of various parameters: -proton beam energy; -target material; -complexity of the geometry model.

irradiation history, beam profile. etc

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Neutron flux in ith cell

⇨The neutron flux is assumed to be constant over the irradiation period and not being modified by the irradiated medium

Geometryand materialsdescription PHITS/

MCNPX

Residues in ith cell

Irradiation Scheme-

H*(10)MCNPX

Activation products&Photon sources

40 y irradiation @5000h

DCHAIN-SP-2001/CINDER

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Proton beam:Gauss :2x = 10 cm 2y =3 cmE= 2.5GeV | ( 1-4) GeV

Target materials: Hg. PbBi. PbAu. W (Ta claded)Target vessel: SS316Moderator clad: AlBeam window: AlMg3

Irradiation history:38 y 5 MW @ 5000h5000 h 5MW3678 h 05000 h 5 MW

Normalization : 5 MW

Moderators: L-H2

R=16cm. H=20cm

Preliminary results

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neutrons

protons

Hg target

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Hg_target

SS vessel

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Hg target

Hg target

Reflector configuration

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SS vessel

Al cladAl clad

SS vessel

59Ni, 14C, 93Mo,91Nb

51Cr, 55Fe, 3H,54Mn

3H, 51Cr, 55Fe,63Ni, 60Co

3H

28Al

26Al, 14C

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Hg target

Hg target

stars

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T#1

T#1

198Au. 187W (n.) (JEF2.2) ?

T#1

194Hg-194Au208Bi202Pb163Ho. 191Nb. 93Mo

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Hg

W

PbBi

PbAu

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Hg PbBi PbAu W

nuclide [Bq/cc] [%] nuclide [Bq/cc] [%] nuclide [Bq/cc] [%] nuclide [Bq/cc] [%]

Tl204 2.08E+16 52.06 H 3 1.74E+16 43.22 1 H 3 2.0132E+16 84.85 W 185 2.72E+16 31.82

H 3 1.65E+16 41.34 Bi207 8.25E+15 20.46 2 Au195 1.4671E+15 6.18 H 3 2.27E+16 26.62

Hg203 7.12E+14 1.78 Pb207m 6.95E+15 17.22 3 Tl204 1.2087E+15 5.90 W 181 2.23E+16 26.10

Au195 6.15E+14 1.54 Po210 5.89E+15 14.60 4 Pt193 1.6217E+14 0.68 Ta182 5.95E+15 6.97

Pt193 3.42E+14 0.85 Tl204 1.20E+15 2.98 5 Ta179 4.6096E+13 0.19 Ta179 2.63E+15 3.07

Ta179 6.89E+13 0.17 Au195 1.33E+14 0.33 6 Bi207 4.2933E+13 0.18 Os185 1.09E+15 1.28

Lu172 5.32E+13 0.13 Po208 5.31E+13 0.13 7 Lu172 3.9563E+13 0.17 Lu173 5.57E+14 0.65

Lu172m 5.27E+13 0.13 Pt193 2.68E+13 0.07 8 Lu172m 3.9175E+13 0.17 Lu172 4.79E+14 0.56

Hf172 5.27E+13 0.13 Lu172 2.35E+13 0.06 9 Hf172 3.9175E+13 0.17 Lu172m 4.75E+14 0.56

Lu173 5.00E+13 0.12 Lu172m 2.33E+13 0.06 10 Lu173 3.7881E+13 0.16 Hf172 4.75E+14 0.56

Activation | TOP 10 @ 1 y

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Hg target

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Beam window #2

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•Changing the proton beam energy while maintaining the same beam power does not change substantially the total radioactivity in the target material

•Induced radioactivity and decay heat depend on the target material. Large differences occur mainly for those materials where the thermal neutron activation is the dominant factor.

•Contribution of moderators and reflector has to be accounted since the early design phase.

•Analysis of the differences obtained by using various tools to be continued.

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Hg target

H*(10) [Sv h-1]

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