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VACUUM ›› 2022, Vol. 59 ›› Issue (6): 60-64.doi: 10.13385/j.cnki.vacuum.2022.06.11

• Measurement and Control • Previous Articles     Next Articles

Study on Electronic Emission of Mo, Hf Grid Material

FANG You-wei, LIU Lin, YU Shi-ji, LI Yu-tao   

  1. Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2021-10-10 Online:2022-11-25 Published:2022-12-05

Abstract: Mo and Hf were respectively deposited onto the surface of cathode with Ba-W by ion beam assisted deposition to imitate the surface conditions of Mo-grids and Hf-grids when absorbing with electron emission substances in the grid-control TWT. The microstructure and composition of the samples were characterized. The ratios of thermo-electronic emission and secondary electron emission between two grids were compared. The results show that the amount of electron emission substances of the cathode adsorbed on the surface of Hf-grids was rather less than that of the Mo-grids. Hf-grids could effectively suppress the electron emission.

Key words: Ba-W cathode, crid emission, themo-electronic emission, the ratio of secondary electron emission

CLC Number: 

  • TG146.4
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