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Particle-in-cell simulation of corona discharge in low pressure in stepped impedance transformer

Liu Lei Li Yong-Dong Wang Rui Cui Wan-Zhao Liu Chun-Liang

Particle-in-cell simulation of corona discharge in low pressure in stepped impedance transformer

Liu Lei, Li Yong-Dong, Wang Rui, Cui Wan-Zhao, Liu Chun-Liang
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Publishing process
  • Received Date:  19 July 2012
  • Accepted Date:  14 August 2012
  • Published Online:  05 January 2013

Particle-in-cell simulation of corona discharge in low pressure in stepped impedance transformer

  • 1. Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, China;
  • 2. Science and Technology on Space Microwave Laboratory, Xi'an 710100, China
Fund Project:  Project supported by the National Key Laboratory Foundation of China (Grant No. 9140C530103110C5301), the National Natural Science Foundation of China (Grant No. 50977076).

Abstract: The corona discharge process in low pressure N2 in stepped impedance transformer (SIT) is simulated using 3-D particle-in-cell (PIC) software (VORPAL). The evolution of the charged particle spatial distribution during the discharge is obtained. The two main discharge mechanisms, i.e., multipactor and corona discharge, are analyzed. From the simulation results, it can be found that the threshold voltage of breakdown of the SIT first decreases and then increases. In addition, with the increase of the pressure, the multipactor effect weakens while the corona discharge effect strengthens. Through the comparison of the threshold voltages between two kinds of wall materials, i.e., Ag and Cu, the critical pressures between the two discharge mechanisms are achieved.

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