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Radiation Shielding Design of the PAL-XFEL
정남석,이희석,오주희,김범종 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.3
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 electronbeams. For the radiation shielding design, a beam-loss scenario suitable for the PAL-XFEL shouldbe 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 thisscenario, the thickness of the accelerator and undulator tunnel of the PAL-XFEL was calculatedby using the SHIELD11 code, and complicated tunnel structures such as maze entrances, slidingdoors, trenches, sleeves, and ducts, were determined under the assumption of a thick iron target byusing the FLUKA code. A detailed design of the main beam dump was established, and shieldingstructures at the front end for suppression of the radiation dose at the experimental area under theaccidental beam-loss scenario were considered. The muon production was estimated by using theFLUKA code.