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- Title
Investigation of Spindt Cold Cathode Electron Guns for Terahertz Traveling Wave Tubes.
- Authors
Li, Yongtao; Li, Hanyan; Feng, Jinjun
- Abstract
In this work, a Spindt cold cathode electron gun with a PPM (periodic permanent magnet) focusing system for a terahertz TWT (traveling wave tube) was designed and simulated based on the Pierce electron gun structure. More specifically, a new 3D (three dimensional) emission model was used, where the cathode radius of the electron gun was 1 mm and the cathode current was 30 mA, with an emitting half angle of about 28°. It was demonstrated that the electron beam was well focused with an electron beam radius of 0.3 mm and a filling ratio of 0.5 when the maximum value of the PPM field along with the axis was 0.122T. According to the simulation results, a planar cold cathode electron gun was developed. Measurements demonstrated that the I/V characteristics of the cold cathode gun were consistent with that of a cold cathode, revealing that the electrons emitted from the cathode are not intercepted when passing through the electron gun.
- Subjects
TRAVELING-wave tubes; ELECTRON gun; SUBMILLIMETER waves; CATHODES; PERMANENT magnets
- Publication
Electronics (2079-9292), 2023, Vol 12, Issue 20, p4197
- ISSN
2079-9292
- Publication type
Article
- DOI
10.3390/electronics12204197