Session: 09-04: Radiation shielding

Paper Number: 135316

135316 - Radiation Shielding Design for Dalian Advanced Light Source Beam Test Platform 

Abstract: 

For the 120MeV,1MHz,100pC superconducting linear electron accelerator by the Dalian Advanced Light Source(DALS) beam test platform, a detailed radiation source terms are analyzed and the effect of the radiation protection potentials are discussed. From the perspective of radiation protection, the source term of beam loss in the Dalian advanced light source is established, the thickness of the walls of the beam test platform was calculated by using the SHIELD11 code, and complicated tunnel structure such as maze entrances, shielding doors and ducts, were determined under the assumption of a thick iron target by using the Monte Carlo code. FLUKA is a general purpose Monte Carlo code and is widely used for studies related to basic research and to applications in particle accelerators、 radiation protection and dosimetry. The reduced variance technique was introduced in the calculation to reduce the statistical error of the calculation results, and the error of the corresponding calculation results was within 5%. In order to ensure the safety of the staff during the operation stage, the dose rates at the side walls and the top plate of the Dalian Advanced Light Source were calculated using FLUKA software simulations and the corresponding dose rates were within the dose limit of 2.5μSv/h, which ensures the safety and health of the staff.  Meanwhile, the analytical method and FLUKA code were used to carry out to design the beam dump and different type of beam dump was determined. Both theoretical formulas and simulation calculations ensured that the energy deposited by the radial and axial in the beam dump was above 99%. On the other hand, the induced radioactivity in accelerator and the decay characteristics of radioactive nuclei were calculated by the FLUKA code. The radiation field induced radioactivity at electron accelerators is very complex as it involves both electromagnetic and hadronic cascade processes. The activity properties of activated substances and the residual dose rate distribution at different cooling time were calculated. The results indicate that the induced radioactivity in the high energy electron accelerator of the DALS is mainly affected by the radionuclide induced in the beam dump. With use the large work, the radiation shielding design proposal of the Dalian Advanced Light Source beam test platform was determined. The research methodology and results are important for radiation analysis and radiation protection in the assessment of the similar accelerator facilities and can provide reliable radiation protection for the environment, public and personnel.

Presenting Author: E Dejun Institute of Advanced Science Facilities

Presenting Author Biography: Dejun E was born in Wuwei ,GanSu ,China in 1994. He has bachelor's degree in the college of nuclear science and technology of Lanzhou University. He is working as a radiation protection engineer in the Institute of Advanced Science Facilities, Shenzhen.His research interests are focused on the radiation protection in the accelerator and nuclear reactors.

Authors:

E Dejun Institute of Advanced Science Facilities
Liming Huang Institute of Advanced Science Facilities, Shenzhen
Changqi Liu Institute of Advanced Science Facilities, Shenzhen
Kai Tao Institute of Advanced Science Facilities, Shenzhen