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VACUUM ›› 2020, Vol. 57 ›› Issue (5): 75-78.doi: 10.13385/j.cnki.vacuum.2020.05.16

• Measurement and Control • Previous Articles     Next Articles

Simulation of Gas Temperature Distribution in Cryo-Vacuum Space for a Neutral Beam Injector

HU Chun-dong1, LANG Jia-qi1,3, XIE Yuan-lai1, WANG Ming-xiang1,3, ZHANG Zhao-yuan2,3, NBI Team1   

  1. 1. Institute of Plasma Physics, Chinese Academy of Sciences, Heifei 230031, China;
    2. HeFei University of Technology, Hefei 230009, China;
    3. University of Science and Technology of China, Heifei 230026, China
  • Received:2019-10-12 Published:2020-11-06

Abstract: The generation and transmission process of the neutral beam requires a vacuum gradient distribution environment. It is very important to accurately get the vacuum degree and its distribution in the vacuum chamber for the commission and operation of the neutral beam. Affected by the temperature of the wall in different areas of a cryo-vacuum space, the gas temperature in the vacuum chamber has a specific distribution characteristics, which has a critical impact on accurate measurement and final determination of the vacuum degree. Based on the Molflow software, the collision frequency and gas molecular density distribution of gas molecules in the vacuum chamber of the full superconducting tokamak neutral beam injector were simulated, and the gas temperature distribution in different regions of the vacuum space was obtained. It provides temperature basis for the amendment of specific vacuum measurement points, and improves the measurement accuracy of the vacuum degree.

Key words: neutral beam, vacuum gradient, Molflow software, gas temperature

CLC Number: 

  • TK39
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