Investigation of an Axial Virtual Cathode Oscillator with an Open-Ended Coaxial Cathodeopen access
- Authors
- Kim, Se-Hoon; Lee, Chang-Jin; Kim, Wan-Il; Ko, Kwang-Cheol
- Issue Date
- May-2022
- Publisher
- Korean Institute of Electromagnetic Engineering and Science
- Keywords
- High-power microwave device; Open-ended coaxial cathode; Pfn-marx generator; Vacuum microwave electronics; Vircator; Virtual cathode oscillator
- Citation
- Journal of Electromagnetic Engineering and Science, v.22, no.3, pp.265 - 271
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- Journal of Electromagnetic Engineering and Science
- Volume
- 22
- Number
- 3
- Start Page
- 265
- End Page
- 271
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/191152
- DOI
- 10.26866/jees.2022.3.r.86
- ISSN
- 2671-7255
- Abstract
- A cathode with an open-ended coaxial structure is experimentally investigated using an axial virtual cathode oscillator (vircator). To enhance the microwave power output, an open-ended coaxial cathode is installed in the axial vircator. The proposed cathode is designed based on the reciprocating frequency of the vircator. The operation features of an axial vircator with a solid cathode, an annular cathode, and an open-ended coaxial cathode are comparatively analyzed through simulations and experiments. Three cathodes are machined using graphite. A stainless steel mesh with a transparency of 70% is used as an anode. The anode-to-cathode gap is fixed to 6 mm. The vircator is driven using a 10-stage PFN-Marx generator with a characteristic impedance of 31 Omega. The PFN-Marx generator applies -150 kV voltage pulses with a 170-200 ns pulse width into the vircator. The microwave power from the solid and annular cathodes is 11.22 MW and 11.27 MW, respectively. The proposed cathode generates a microwave with a power of 12.65 MW while enhancing the microwave power by 13% compared with the solid and annular cathodes. The proposed cathode shows a frequency shift to 3.4 GHz, which is a much lower frequency than that of the solid cathode at 6.34 GHz.
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