Supershort avalanche electron beam in SF6 and krypton

被引：38

作者：

Zhang, Cheng ^{[1
]}

Tarasenko, Victor F. ^{[2
,3
,4
]}

Gu, Jianwei ^{[1
]}

Baksht, Evgeni Kh. ^{[2
]}

Beloplotov, Dmitry V. ^{[2
,4
]}

Burachenko, Alexander G. ^{[2
,4
]}

Yan, Ping ^{[1
]}

Lomaev, Mikhail I. ^{[2
,4
]}

Shao, Tao ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Elect Engn, Beijing 100190, Peoples R China

[2] Russian Acad Sci, Inst High Current Elect, Tomsk 634055, Russia

[3] Natl Res Tomsk Polytech Univ, Tomsk 634050, Russia

[4] Natl Res Tomsk State Univ, Tomsk 634050, Russia

来源：

PHYSICAL REVIEW ACCELERATORS AND BEAMS | 2016年 / 19卷 / 03期

基金：

中国国家自然科学基金;

关键词：

NANOSECOND DISCHARGE; GENERATION; AIR; BREAKDOWN; VACUUM; ENERGY; DIODES;

D O I：

10.1103/PhysRevAccelBeams.19.030402

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Runaway electrons play an important role in the avalanche formation in nanosecond- and subnano-second-pulse discharges. In this paper, characteristics of a supershort avalanche electron beam (SAEB) generated at the subnanosecond and nanosecond breakdown in sulfur hexafluoride (SF6) in an inhomogeneous electric field were studied. One pulser operated at negative polarity with voltage pulse amplitude of similar to 130 kV and rise time of 0.3 ns. The other pulser operated at negative polarity with voltage pulse amplitude of 70 kV and rise time of similar to 1.6 ns. SAEB parameters in SF6 are compared with those obtained in krypton (Kr), nitrogen (N-2), air, and mixtures of SF6 with krypton or nitrogen. Experimental results showed that SAEB currents appeared during the rise-time of the voltage pulse for both pulsers. Moreover, amplitudes of the SAEB current in SF6 and Kr approximately ranged from several to tens of milliamps at atmospheric pressure, which were smaller than those in N-2 and air (ranging from hundreds of milliamps to several amperes). Furthermore, the concentration of SF6 additive could significantly reduce the SAEB current in N-2-SF6 mixture, but it slightly affected the SAEB current in Kr-SF6 mixture because of the atomic/molecular ionization cross section of the gas had a much greater impact on the SAEB current rather than the electronegativity.

引用

页数：7

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