The construction of the Pohang Accelerator Laboratory X-ray Free Electron Laser (PAL-XFEL) started in 2011. The PAL-XFEL is designed to generate X-rays using 10 GeV, 0.2 nC electron beams. For the radiation shielding design, a beam-loss scenario suitable for the PAL-XFEL should be established. The beam-loss scenario was determined and categorized as normal or accidental. The electron beam will be shut down automatically when accidental beam-loss occurs. Using this scenario, the thickness of the accelerator and undulator tunnel of the PAL-XFEL was calculated by using the SHIELD11 code, and complicated tunnel structures such as maze entrances, sliding doors, trenches, sleeves, and ducts, were determined under the assumption of a thick iron target by using the FLUKA code. A detailed design of the main beam dump was established, and shielding structures at the front end for suppression of the radiation dose at the experimental area under the accidental beam-loss scenario were considered. The muon production was estimated by using the FLUKA code.
[1]
N. Jung,et al.
Development of Neutron Skyshine Evaluation Method for High Energy Electron Accelerator Using Monte Carlo Code
,
2013
.
[2]
A. Ferrari,et al.
FLUKA: A Multi-Particle Transport Code
,
2005
.
[3]
W. Nelson,et al.
The SHIELD11 computer code
,
2005
.
[4]
M. Pelliccioni,et al.
Estimation of fluence rate and absorbed dose rate due to gas bremsstrahlung from electron storage rings
,
1993
.
[5]
H. Moe.
Advanced photon source: Radiological design considerations
,
1991
.
[6]
G. Tromba,et al.
Gas bremsstrahlung from electron storage rings: A Monte Carlo evaluation and some useful formulae
,
1990
.
[7]
M. Alpsten,et al.
Radiological safety aspects of the operation of electron linear accelerators
,
1979
.