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Diagnostics and Improvement of the Velocity and Density Characteristic of Deuterium/Hydrogen Supersonic Molecular Gas Jet

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Abstract

The detailed evolution process of deuterium and hydrogen supersonic molecular beam (SMB) was probed by one simple method based on the microphone. The velocity of the beam was measured by time-of-flight method, and the density was investigated by comparing the radial profiles of the SMB with the total amounts of molecules in the gas jet. The velocity and number density of deuterium SMB generated from a cylindrical nozzle were tested to be 1100 m/s and 3.6E15 cm−3 at axial distance of 1700 mm and stagnation pressure of 50 bar, which was about 30% lower than that of hydrogen SMB generated from the same nozzle, and was in consistent with the total number of molecules in deuterium gas jet that was 30% smaller than hydrogen. It is found that the use of a cylindrical nozzle and arrangement of a special skimmer can increase the central density of SMB by about 150% and 45%, while the utilization of one conical nozzle would increase the velocity of the SMB by 13%, these results could give great help in the SMB diagnostics and fueling of the nuclear fusion experiments.

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Acknowledgements

The project is supported by the National Magnetic Confinement Fusion Program of China (2014GB125004) and the National Natural Science Foundation of China (11275133, 11575121).

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Authors and Affiliations

  1. Key Laboratory of Radiation Physics and Technology of the Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, 610064, Sichuan, People’s Republic of China

    Zhiyuan Chen, Min Li, Maolei Zhou, Dong Liu, Guofeng Qu, Yizhou Wang & Jifeng Han

  2. Southwest Reactor Engineering Research and Design Academy, Chengdu, 610000, Sichuan, People’s Republic of China

    Zhiyuan Chen

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  1. Zhiyuan Chen
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  2. Min Li
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  3. Maolei Zhou
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  4. Dong Liu
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  6. Yizhou Wang
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  7. Jifeng Han
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Correspondence to Guofeng Qu or Jifeng Han.

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Chen, Z., Li, M., Zhou, M. et al. Diagnostics and Improvement of the Velocity and Density Characteristic of Deuterium/Hydrogen Supersonic Molecular Gas Jet. J Fusion Energ 38, 228–235 (2019). https://doi.org/10.1007/s10894-018-0208-8

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  • DOI: https://doi.org/10.1007/s10894-018-0208-8

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