Design of Radiation Shielding for Optical Enclosure at HEPS Beamline Station
High energy photon source (HEPS) is one of the major scientific and technological infrastructure in the 13th Five-Year Plan of China. HEPS is a 6 GeV, 200 mA fourth-generation synchrotron light source. HEPS is capable of emitting X-rays up to 300 keV in energy and can build more than 80 advanced bea...
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Editorial Board of Atomic Energy Science and Technology
2025-02-01
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| author | GUO Qingyang, SHI Hong, LIU Qiongyao, ZHANG Huijie, SHI Haoyu, MA Zhongjian, WANG Qingbin |
| author_facet | GUO Qingyang, SHI Hong, LIU Qiongyao, ZHANG Huijie, SHI Haoyu, MA Zhongjian, WANG Qingbin |
| author_sort | GUO Qingyang, SHI Hong, LIU Qiongyao, ZHANG Huijie, SHI Haoyu, MA Zhongjian, WANG Qingbin |
| collection | DOAJ |
| description | High energy photon source (HEPS) is one of the major scientific and technological infrastructure in the 13th Five-Year Plan of China. HEPS is a 6 GeV, 200 mA fourth-generation synchrotron light source. HEPS is capable of emitting X-rays up to 300 keV in energy and can build more than 80 advanced beamline stations. After completion, it will be the first high-energy synchrotron source owned by China. Beamline stations are used for producing, processing, and analyzing synchronous radiation. At beamline stations, harmful radiation inevitably generated directly determine the occupational radiation exposure (ORE) during operation and maintenance of HEPS. Radiation protection of beamline stations forms a crucial aspect of HEPS construction. Optical enclosures are the zone receiving the highest levels of radiation at each beamline station, with numerous optical enclosures present in HEPS. How to meet protection requirements while exploring flexible shielding design solutions that can be applied to various beamline stations has become an urgent problem to be solved. This paper studied the key issues of radiation protection in optical enclosures at HEPS beamline stations and conducted a structured design for radiation protection. Initially, an analysis was conducted on the structural features and the source term of beamline stations. The beamline stations were categorized into three distinct types: bending magnet, undulator, and wiggler. Items from radiation sources were categorized into two distinct types: gas bremsstrahlung and synchrotron radiation. The optical enclosures were standardized and categorized according to their structural features and the type of source item. Standardization involved determining the most intense radiation conditions at a similar type of beamline station. The outcomes of these calculations served as a benchmark for other beamline stations of a similar nature. For the gas bremsstrahlung, the equipment layout of the typical beamline station was introduced from the perspective of radiation protection. Attenuation of radiation dose in the shield was analyzed by Monte Carlo code FLUKA. An analysis was conducted on the correlation between the dose of gas bremsstrahlung and the shielding thickness. For synchrotron radiation, the synchrotron radiation spectrum of HEPS beamlines was calculated by STAC8 code. The influence of synchrotron radiation scattering angle was analyzed. Attenuation of synchrotron radiation dose in the shield was analyzed by STAC8. An analysis was conducted on how synchrotron radiation dosage correlates with the shielding thickness. Results from the calculations indicate a pattern where the dose rate from gas bremsstrahlung initially rises and subsequently falls within the back wall. The reason lies in the fact that gas bremsstrahlung’s dispersed photons maintain a specific forward alignment and engage in photonuclear reactions to generate neutrons on the back wall. With the scattering target tilted at 45°, the highest synchrotron radiation dose rate beyond the shielding wall is between 40° and 60°. The radiation dose rates on the side and back walls primarily originate from gas bremsstrahlung, whereas those outside the roof are chiefly from synchrotron radiation. |
| format | Article |
| id | doaj-art-613d192db67d49e5863fd43e82257cba |
| institution | Kabale University |
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| language | English |
| publishDate | 2025-02-01 |
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| spelling | doaj-art-613d192db67d49e5863fd43e82257cba2025-08-20T03:34:53ZengEditorial Board of Atomic Energy Science and TechnologyYuanzineng kexue jishu1000-69312025-02-0159249450210.7538/yzk.2024.youxian.0385Design of Radiation Shielding for Optical Enclosure at HEPS Beamline StationGUO Qingyang, SHI Hong, LIU Qiongyao, ZHANG Huijie, SHI Haoyu, MA Zhongjian, WANG Qingbin0Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, ChinaHigh energy photon source (HEPS) is one of the major scientific and technological infrastructure in the 13th Five-Year Plan of China. HEPS is a 6 GeV, 200 mA fourth-generation synchrotron light source. HEPS is capable of emitting X-rays up to 300 keV in energy and can build more than 80 advanced beamline stations. After completion, it will be the first high-energy synchrotron source owned by China. Beamline stations are used for producing, processing, and analyzing synchronous radiation. At beamline stations, harmful radiation inevitably generated directly determine the occupational radiation exposure (ORE) during operation and maintenance of HEPS. Radiation protection of beamline stations forms a crucial aspect of HEPS construction. Optical enclosures are the zone receiving the highest levels of radiation at each beamline station, with numerous optical enclosures present in HEPS. How to meet protection requirements while exploring flexible shielding design solutions that can be applied to various beamline stations has become an urgent problem to be solved. This paper studied the key issues of radiation protection in optical enclosures at HEPS beamline stations and conducted a structured design for radiation protection. Initially, an analysis was conducted on the structural features and the source term of beamline stations. The beamline stations were categorized into three distinct types: bending magnet, undulator, and wiggler. Items from radiation sources were categorized into two distinct types: gas bremsstrahlung and synchrotron radiation. The optical enclosures were standardized and categorized according to their structural features and the type of source item. Standardization involved determining the most intense radiation conditions at a similar type of beamline station. The outcomes of these calculations served as a benchmark for other beamline stations of a similar nature. For the gas bremsstrahlung, the equipment layout of the typical beamline station was introduced from the perspective of radiation protection. Attenuation of radiation dose in the shield was analyzed by Monte Carlo code FLUKA. An analysis was conducted on the correlation between the dose of gas bremsstrahlung and the shielding thickness. For synchrotron radiation, the synchrotron radiation spectrum of HEPS beamlines was calculated by STAC8 code. The influence of synchrotron radiation scattering angle was analyzed. Attenuation of synchrotron radiation dose in the shield was analyzed by STAC8. An analysis was conducted on how synchrotron radiation dosage correlates with the shielding thickness. Results from the calculations indicate a pattern where the dose rate from gas bremsstrahlung initially rises and subsequently falls within the back wall. The reason lies in the fact that gas bremsstrahlung’s dispersed photons maintain a specific forward alignment and engage in photonuclear reactions to generate neutrons on the back wall. With the scattering target tilted at 45°, the highest synchrotron radiation dose rate beyond the shielding wall is between 40° and 60°. The radiation dose rates on the side and back walls primarily originate from gas bremsstrahlung, whereas those outside the roof are chiefly from synchrotron radiation.beamline stationoptical enclosuregas bremsstrahlungsynchrotron radiationshielding design |
| spellingShingle | GUO Qingyang, SHI Hong, LIU Qiongyao, ZHANG Huijie, SHI Haoyu, MA Zhongjian, WANG Qingbin Design of Radiation Shielding for Optical Enclosure at HEPS Beamline Station Yuanzineng kexue jishu beamline station optical enclosure gas bremsstrahlung synchrotron radiation shielding design |
| title | Design of Radiation Shielding for Optical Enclosure at HEPS Beamline Station |
| title_full | Design of Radiation Shielding for Optical Enclosure at HEPS Beamline Station |
| title_fullStr | Design of Radiation Shielding for Optical Enclosure at HEPS Beamline Station |
| title_full_unstemmed | Design of Radiation Shielding for Optical Enclosure at HEPS Beamline Station |
| title_short | Design of Radiation Shielding for Optical Enclosure at HEPS Beamline Station |
| title_sort | design of radiation shielding for optical enclosure at heps beamline station |
| topic | beamline station optical enclosure gas bremsstrahlung synchrotron radiation shielding design |
| work_keys_str_mv | AT guoqingyangshihongliuqiongyaozhanghuijieshihaoyumazhongjianwangqingbin designofradiationshieldingforopticalenclosureathepsbeamlinestation |