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Factors determining parasitic thermionic current in cathode-grid units with pyrographite grids
Bogachev R. Yu.
1,2, Krachkovskaya T. M.
1, Shesterkin V. I.
1, Zhuravlev S. D.
1, Glukhova O. E.
1,3,4, Kolosov D. A.
1,3
1Joint Stock Company Research and Production Enterprise Almaz, Saratov, Russia
2Yuri Gagarin State Technical University of Saratov, Saratov, Russia
3Saratov State University, Saratov, Russia
4I.M. Sechenov First Moscow State Medical University, Moscow, Russia
2Yuri Gagarin State Technical University of Saratov, Saratov, Russia
3Saratov State University, Saratov, Russia
4I.M. Sechenov First Moscow State Medical University, Moscow, Russia
Email: BogachevRU@almaz-rpe.ru, elektron.t@bk.ru, glukhovaoe@info.sgu.ru, kolosovda@bk.ru
The article presents the results of studying the grid electrodes made of anisotropic pyrolytic graphite (APG) as part of the cathode-grid unit (CGU) of a powerful pulsed traveling-wave tube (TWT). It was found that the grid electrodes made of APG demonstrated high anti-emission properties in the temperature range of 800 oC-900 oC at cathode temperatures of 1080 oC-1150 oC. It was found that during testing the CGU as part of a TWT device for 900 hours in the forced mode (the cathode temperature exceeded the operating temperature by 70 oC), there was no parasitic thermionic current in the cathode-control grid circuit. This result can be explained by an increase in the electron work function of the APG with a barium oxide film adsorbed on its surface. The results of calculations using the density functional method and quantum molecular dynamics modeling for the structure of APG with a BaO film having a hexagonal lattice showed that the value of its electron work function was ~ 5.14 eV, which is significantly higher than the work function of APG (~ 4.7 eV) and barium oxide (~ 1-1.6 eV). Keywords: parasitic thermal emission, cathode-grid unit, anisotropic pyrolytic graphite, density functional theory, adsorption, molecular dynamics modeling.
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