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VACUUM ›› 2022, Vol. 59 ›› Issue (3): 68-73.doi: 10.13385/j.cnki.vacuum.2022.03.14

• Measurement and Control • Previous Articles     Next Articles

Preliminary Results of Mass Spectrometry Measurements for HL-2M Tokamak

ZHOU Jun, CAO Zeng, CAO Cheng-zhi, HUANG Xiang-mei, GAO Xiao-yan, HU Yi   

  1. Southwestern Institute of Physics, Chengdu 610041
  • Received:2021-05-21 Online:2022-05-25 Published:2022-06-01

Abstract: A quadrupole mass spectrometer was used to measure and analyze the residual gas in the vacuum vessel of HL-2M in the process of baking and glow discharge cleaning(GDC), and the pumping performance of the cryopumps for H2O in the pumping system was studied. After baking with a maximum temperature of 100℃,the partial pressure of 18(H2O) and 28(CO) were reduced by 47.96% and 17.63%, respectively. The ion current of 18(H2O), 28(CO) and 32(O2) during the GDC went down remarkably. And the product of the GDC was exhausted by the pumping system, which effectively reduced impurities such as carbon and oxygen. The partial pressure of 18(H2O) and 28(CO) were reduced by 3.2×10-5Pa and 3.7×10-6Pa, respectively, with four cryopump operation and the steady state vacuum. Mass spectrometry measurement and analytical results provide useful supports for the initial plasma discharge of the HL-2M tokamak.

Key words: HL-2M tokamak, mass spectrometry measurement, mass charge ratio, residual gas analysis

CLC Number: 

  • TL62+8
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