Abstract
Runaway electrons play an important role in the avalanche formation in nanosecond- and subnanosecond- 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 ∼30 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 ∼1.6 ns. SAEB parameters in SF6 are compared with those obtained in krypton (Kr), nitrogen (N2), 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 N2 and air (ranging from hundreds of milliamps to several amperes). Furthermore, the concentration of SF6 additive could significantly reduce the SAEB current in N2-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.
| Original language | English |
|---|---|
| Article number | 030402 |
| Journal | Physical Review Accelerators and Beams |
| Volume | 19 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2016 |
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ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)
- Nuclear and High Energy Physics
- Surfaces and Interfaces
Cite this
Supershort avalanche electron beam in SF6 and krypton. / Zhang, Cheng; Tarasenko, Victor F.; Gu, Jianwei; Baksht, Evgeni Kh; Beloplotov, Dmitry V.; Burachenko, Alexander G.; Yan, Ping; Lomaev, Mikhail I.; Shao, Tao.
In: Physical Review Accelerators and Beams, Vol. 19, No. 3, 030402, 2016.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Supershort avalanche electron beam in SF6 and krypton
AU - Zhang, Cheng
AU - Tarasenko, Victor F.
AU - Gu, Jianwei
AU - Baksht, Evgeni Kh
AU - Beloplotov, Dmitry V.
AU - Burachenko, Alexander G.
AU - Yan, Ping
AU - Lomaev, Mikhail I.
AU - Shao, Tao
PY - 2016
Y1 - 2016
N2 - Runaway electrons play an important role in the avalanche formation in nanosecond- and subnanosecond- 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 ∼30 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 ∼1.6 ns. SAEB parameters in SF6 are compared with those obtained in krypton (Kr), nitrogen (N2), 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 N2 and air (ranging from hundreds of milliamps to several amperes). Furthermore, the concentration of SF6 additive could significantly reduce the SAEB current in N2-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.
AB - Runaway electrons play an important role in the avalanche formation in nanosecond- and subnanosecond- 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 ∼30 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 ∼1.6 ns. SAEB parameters in SF6 are compared with those obtained in krypton (Kr), nitrogen (N2), 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 N2 and air (ranging from hundreds of milliamps to several amperes). Furthermore, the concentration of SF6 additive could significantly reduce the SAEB current in N2-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.
UR - http://www.scopus.com/inward/record.url?scp=85011064849&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85011064849&partnerID=8YFLogxK
U2 - 10.1103/PhysRevAccelBeams.19.030402
DO - 10.1103/PhysRevAccelBeams.19.030402
M3 - Article
AN - SCOPUS:85011064849
VL - 19
JO - Physical Review Accelerators and Beams
JF - Physical Review Accelerators and Beams
SN - 2469-9888
IS - 3
M1 - 030402
ER -