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Title: A comparison between spectra of runaway electron beams in SF{sub 6} and air

Runaway electron (RAE) with extremely high-energy plays important role on the avalanche propagation, streamer formation, and ionization waves in nanosecond-pulse discharges. In this paper, the generation of a supershort avalanche electron beam (SAEB) in SF{sub 6} and air in an inhomogeneous electric field is investigated. A VPG-30-200 generator with a pulse rise time of ∼1.6 ns and a full width at half maximum of 3–5 ns is used to produce RAE beams. The SAEBs in SF{sub 6} and air are measured by using aluminum foils with different thicknesses. Furthermore, the SAEB spectra in SF{sub 6} and air at pressures of 7.5 Torr, 75 Torr, and 750 Torr are compared. The results showed that amplitude of RAE beam current generated at the breakdown in SF{sub 6} was approximately an order of magnitude less than that in air. The energy of SAEB in air was not smaller than that in SF{sub 6} in nanosecond-pulse discharges under otherwise equal conditions. Moreover, the difference between the maximum energy of the electron distributions in air and SF{sub 6} decreased when the rise time of the voltage pulse increased. It was because the difference between the breakdown voltages in air and SF{sub 6} decreased when the rise time of the voltagemore » pulse increased.« less
Authors:
; ; ;  [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [3]
  1. Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190 (China)
  2. (China)
  3. Institute of High Current Electronics, 2/3 Akademichesky Ave., Tomsk 634055 (Russian Federation)
  4. (Russian Federation)
Publication Date:
OSTI Identifier:
22489977
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AIR; ALUMINIUM; BEAM CURRENTS; BREAKDOWN; ELECTRIC FIELDS; ELECTRIC POTENTIAL; ELECTRON BEAMS; PRESSURE RANGE KILO PA; PULSE RISE TIME; PULSES; RUNAWAY ELECTRONS; SPECTRA; SULFUR FLUORIDES; THICKNESS