| Autor: |
Cheng Zhang (章程), Victor F. Tarasenko, Jianwei Gu (顾建伟), Evgeni Kh. Baksht, Dmitry V. Beloplotov, Alexander G. Burachenko, Ping Yan (严萍), Mikhail I. Lomaev, Tao Shao (邵涛) |
| Jazyk: |
angličtina |
| Rok vydání: |
2016 |
| Předmět: |
|
| Zdroj: |
Physical Review Accelerators and Beams, Vol 19, Iss 3, p 030402 (2016) |
| Druh dokumentu: |
article |
| ISSN: |
2469-9888 |
| DOI: |
10.1103/PhysRevAccelBeams.19.030402 |
| Popis: |
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 (SF_{6}) in an inhomogeneous electric field were studied. One pulser operated at negative polarity with voltage pulse amplitude of ∼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 ∼1.6 ns. SAEB parameters in SF_{6} are compared with those obtained in krypton (Kr), nitrogen (N_{2}), air, and mixtures of SF_{6} 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 SF_{6} 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 SF_{6} additive could significantly reduce the SAEB current in N_{2}-SF_{6} mixture, but it slightly affected the SAEB current in Kr-SF_{6} 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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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