Calculation of hydrogen and helium concentrations for CSNS target

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Dong-Dong Pan, Tai-Ran Liang, Wen Yin and Ze-En Yao. Calculation of hydrogen and helium concentrations for CSNS target[J]. Chinese Physics C, 2016, 40(3): 037004. doi: 10.1088/1674-1137/40/3/037004
Dong-Dong Pan, Tai-Ran Liang, Wen Yin and Ze-En Yao. Calculation of hydrogen and helium concentrations for CSNS target[J]. Chinese Physics C, 2016, 40(3): 037004.  doi: 10.1088/1674-1137/40/3/037004 shu
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Received: 2015-06-19
Revised: 2015-10-13
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    Supported by National Science Foundation of China (51371195, 11174358)

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Calculation of hydrogen and helium concentrations for CSNS target

    Corresponding author: Wen Yin,
  • 1. School of Nuclear and technology, Lanzhou University, Lanzhou 730000, China
  • 2. Spallation Neutron Source Engineering Center for Target and Instrument, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Science, Beijing 100190, Chin
  • 3. Dongguan Branch, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • 4. Spallation Neutron Source Engineering Center for Target and Instrument, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Science, Beijing 100190, Chin
  • 5. School of Physics and Electronic Information, Inner Mongolia University for the Nationalities, Tongliao 028043, China
  • 6.  Spallation Neutron Source Engineering Center for Target and Instrument, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Science, Beijing 100190, Chin
  • 7.  School of Nuclear and technology, Lanzhou University, Lanzhou 730000, China
Fund Project:  Supported by National Science Foundation of China (51371195, 11174358)

Abstract: The China Spallation Neutron Source (CSNS) is driven by protons whose energies are about 1.6 GeV. At such high energies, the spallation neutrons lead to the formation of large amounts of helium, hydrogen and new heavier species in the form of transmutation products. These hydrogen, helium and transmutation products have a critical effect on the mechanical properties on the one hand and exacerbate the displacement radiation damage on the other hand. In this paper, the background hydrogen/helium concentrations and the maximum hydrogen/helium concentrations near cracks in a tungsten target for CSNS have been calculated at temperatures of 100℃ and 300℃ by applying a theoretical model. For the CSNS tungsten target plate, we find the maximum hydrogen concentration near the tips of cracks ranges from 3.0× 10-2-2×10-1, which exceeds the hydrogen background concentration by 1.2-1.8 times; the maximum helium concentration near the tips of cracks ranges from 3.0× 10-4-1.2×10-3, which exceeds the helium background concentration by 2-4 times; the maximum hydrogen/helium concentration increases with the increase of the transfer length across the surfaces of the target and it decreases with the increase of temperature.

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