# Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2019, Vol. 30 ›› Issue (5): 75

• NUCLEAR ENERGY SCIENCE AND ENGINEERING •

### Production threshold impact on a GEANT4 calculation of the power deposition in a fast domain: MEGAPIE spallation target

Abdesslam Lamrabet1,2 • Abdelmajid Maghnouj1 • Jaouad Tajmouati1 • Mohamed Bencheikh1

1. 1 Laboratory of Integration of Systems and Advanced Technologies, Faculty of Sciences Dhar El mahraz, University Sidi Mohamed Ben Abdellah, 30000 Fes, Morocco
2 El Hajeb, Morocco
• Received:2018-08-21 Revised:2018-10-01 Accepted:2018-11-03
• Contact:` Abdesslam Lamrabet E-mail:abdesslam.lamrabet@usmba.ac.ma
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Abdesslam Lamrabet, Abdelmajid Maghnouj, Jaouad Tajmouati, Mohamed Bencheikh. Production threshold impact on a GEANT4 calculation of the power deposition in a fast domain: MEGAPIE spallation target.Nuclear Science and Techniques, 2019, 30(5): 75

Abstract: The calculation time in the Monte Carlo simulations consistently represents an essential issue. It is often very long, and its decrease constitutes a challenge for the simulator. Generally, an MC simulation is qualified as quality or not according to two main criteria: the calculation time and the accuracy of the results. However, in most cases, the optimization of one criterion affects negatively the other. Therefore, a compromise between both of them is always required in this kind of simulation. The present work aims at studying the impact of the production threshold (or cut) of the GEANT4 toolkit on the calculation of the power deposition in the MEGAPIE spallation target. The production threshold of secondaries is a GEANT4 intrinsic parameter. It indicates the limit of energy we can reach in the production of secondary particles. This study has allowed us to make the following conclusions. First, the influence of the cut on the calculation of the deposited power depends on the volume size, its arrangement and the importance of the electromagnetic processes occurring within. Second, the accuracy of the calculations can be acceptable only below a given value of the cut energy. Third, this accuracy remains almost unchangeable from a certain value of the cut. The study has also made it possible to explore the prevalence of certain interactions in the zone of spallation in the MEGAPIE target.