2. june [email protected] 1 verification of monte carlo transport codes fluka, mars and...
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2. June 2010 [email protected] 1
Verification of Monte Carlo Verification of Monte Carlo Transport Codes FLUKA, Transport Codes FLUKA,
MARS and SHIELD-AMARS and SHIELD-A
Vera Chetvertkova, E. Mustafin, I.Strasik (GSI, Germany)
L.Latysheva, N. Sobolevskiy (INR RAS, Russia)
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ContentContent
1. Introduction
2. Verification of electronic stopping modules Experiment Simulations
3. Verification of isotope production modules Experiment Simulations
4. Discussion
5. Summary
6. Conclusion
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1. Introduction1. Introduction
Monte Carlo codes- used in estimation of radiation hazards in accelerator facilities- are being constantly developed
Verification of the codes is needed
Project 'Verification of MC transport codes
FLUKA, MARS and SHIELD-A'
- Verification of electronic stopping modules- Verification of isotope production modules
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2. Verification of electronic stopping 2. Verification of electronic stopping modules:modules:ExperimentExperiment
A.A. Golubev, E. Mustafin et al, Measurement of the energy deposition profile for 238U ions with specific energy 500 and 950 MeV/u in stainless steel and
copper targets, NIM B 263 (2007) 339–344
The idea: measuring energy deposition function and stopping range using the thick target technique
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2. Verification of electronic stopping 2. Verification of electronic stopping modules:modules:SimulationsSimulations
1. Energy deposition function [GeV/mm] + range [mm]
Target material equivalent thickness
Stainless steel: 262 µm
Copper: 235 µm
Range, mm
E = 500 MeV/u E = 950 MeV/u
St. steel Cu St. steel Cu
Measurement 6.0 ± 0.2 5.5 ± 0.2 14.4 ± 0.4 13.1 ± 0.4
ATIMA 6.0 5.5 14.4 13.2
PHITS 6.1 5.6 14.6 13.3
SHIELD 5.6 5.1 15.0 13.6
SRIM 6.5 6.0 16.2 14.7
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2. Verification of electronic stopping 2. Verification of electronic stopping modules:modules:SimulationsSimulations
500 MeV/u
U beam
Stainless steel target Copper target
950 MeV/u U beam
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2. Verification of electronic stopping 2. Verification of electronic stopping modules:modules:SimulationsSimulations
Measured and calculated penetration depths of 238U ions in copper and stainless steel targets
Penetration depth, mm
E = 500 MeV/u E = 950 MeV/u
St. steel Cu St. steel Cu
Measurement 5.7 ± 0.2 5.3 ± 0.2 14.1 ± 0.4 12.9 ± 0.4
SHIELD-A 5.825 5.335 14.295 14.175
MARS 5.95 5.455 14.6 13.355
FLUKA 6.065 5.595 15.355 14.245
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3. Verification of isotope production 3. Verification of isotope production modules:modules:ExperimentExperiment
Scheme of the experiment
Irradiation:
500 MeV/u argon beam
Measurements:
HPGe detector, 20% efficiency, Energy range: 30keV – 2 MeV Energy resolution at 122 keV – 0.9 keV; at 1.33 MeV – 1.9 keV
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3. Verification of isotope production 3. Verification of isotope production modules:modules:ExperimentExperiment
Cylinder assembled from discsIsotope distribution
Depth profiles of activation
1. Simulations of the interaction of certain ions with chosen target =>Finding the stopping range
2. Assembling the target3. Irradiation4. Measurements of the residual
activity => experimental study of the depth profiles of activity
Activation foils
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Activation of the aluminum targetActivation of the aluminum target
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3. Verification of isotope production 3. Verification of isotope production modules:modules:SimulationsSimulations
Depth profiles of the isotopes activated by argon beam of 500 MeV/u in aluminum target
Depth profiles of 7Be Depth profiles of 22Na
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4. Discussion4. Discussion
How could the discrepancies be explained?
? Differences in cross sections? Different number of simulated secondary particles? Different models of nuclear interactions? ???
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5. Summary5. Summary
Experiments for finding energy deposition function of uranium ions in copper and stainless steel were held, respective simulations were done
Activation of aluminum by argon ions was studied, depth profiles were analyzed and respective simulations were performed
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6. Conclusion6. Conclusion
MARS and SHIELD-A – the stopping range of U ions (500 MeV/u; 1 GeV/u) in copper and
stainless steel was consistent with the experimental results within the error bars
– depth profiles of activity induced by argon beam (500 MeV/u) in aluminum target were different either in shape or absolute values (25%÷100% discrepancies)
FLUKA – depth profiles of activity induced by argon beam in aluminum target
were consistent with the experimental ones within the error bars
– the stopping range of the uranium ions was overestimated by 5% for 500 MeV/u and 10% for 950 MeV/u beam