Investigation on pulsed discharge mode in SF6-C2H6 mixtures

Nannan YANG (杨楠楠); Guofu LI (李国富); Yongli ZHAO (赵永利); Jialiang ZHANG (张家良); Xiaoqiong WEN (温小琼)

doi:10.1088/2058-6272/ab675f

Plasma Science and Technology > 2020 > 22(3): 34015-034015. > DOI: 10.1088/2058-6272/ab675f

Nannan YANG (杨楠楠), Guofu LI (李国富), Yongli ZHAO (赵永利), Jialiang ZHANG (张家良), Xiaoqiong WEN (温小琼). Investigation on pulsed discharge mode in SF₆-C₂H₆ mixtures[J]. Plasma Science and Technology, 2020, 22(3): 34015-034015. DOI: 10.1088/2058-6272/ab675f

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Investigation on pulsed discharge mode in SF₆-C₂H₆ mixtures

¹ State Key Laboratory for Material Modification, Dalian University of Technology, Dalian 116024, People’s Republic of China
² State Key Laboratory of Chemical Lasers, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People’s Republic of China

Funds: This work is supported by National Natural Science Foundation of China (No. 11375041).

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Received Date: September 04, 2019
Revised Date: January 02, 2020
Accepted Date: January 02, 2020

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Abstract

Abstract

The non-chain chemical HF(DF) laser is one of the most powerful electrically-driven lasers operating in mid-infrared, in which SF₆-C₂H₆ mixtures are often used as lasering media. Due to the electronegativity of SF₆, the discharge in SF₆-C₂H₆ presents a complicated discharge mode. To achieve reproducible pulsed laser output, pulsed discharge in SF₆-C₂H₆ mixtures is investigated for discharge mode using plane electrodes assisted by array pre-ionization spark pins in cathode surface. Firstly, two modes can be distinguished. One mode is called the selfsustained volume discharge (SSVD), which is characterized by spatial uniformity in the discharge gap and pulse to pulse repeatability. On the contrary, another mode includes random arc passages in the discharge gap and therefore cannot conduct lasering. By varying discharge conditions (gap voltage, gas pressure, etc) two discharge modes are observed. Secondly, the holding scope of the SSVD mode is analyzed for the optimal mixture ratio of 20:1, and the boundary tend of the holding scope of SSVD indicates there exists maximum gas pressure and maximum charging voltage for SSVD. Finally, the peak current of SSVD relates positively to charging voltage, while negatively to gas pressure, from which it is drawn that synchronous electron avalanches initiated by the sliding array overlap spatially into SSVD and thus SSVD is essentially an α ionization avalanche.
- pulsed chemical HF laser,
- SF₆-C₂H₆ mixtures,
- discharge mode,
- α ionizationavalanche

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References

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Investigation on pulsed discharge mode in SF₆-C₂H₆ mixtures