Speaker
Description
For advanced shielding design of high energy electron accelerators, accuracy of nuclear model and data base used in the theoretical simulations should be validated with the experimental data. For this purpose, shielding and activation experiment with secondary particles generated from the beam dump was performed using 2.2, 4.3, 6.4 and 8.45 GeV electron beams at JLAB. The beam dump consists of aluminum and circulated water coolant. In the concrete shield upstream of the beam dump, there are three vertical penetration holes reaching the beam line level 10 m down from the ground level. The concrete shield thicknesses at the three holes are 91, 273 and 570 cm, and aluminum or graphite activation samples were placed in the penetration holes during the irradiation. After the irradiation, gamma rays from the produced radionuclides of Na-24 from aluminum and C-11 from graphite were measured and attenuation profiles of the production rates through the shield were experimentally obtained. Monte Carlo simulations with the experimental conditions were also performed, and they were generally agreed within a factor of 2.
This experiment project is performed as the collaboration between KEK and JLAB under the support by the USA-DOE.
| Scientific Topic 3 | Code benchmarking and intercomparison |
|---|---|
| Scientific Topic 4 | Shielding and dosimetry |
