Measuring picosecond flashover in closing coaxial spark gap switch

J. Klüss, J. Hällström

Research output: Contribution to journalArticleScientificpeer-review


Flashover voltage and picosecond risetime of breakdown in pressurized SF6 gas is studied on a, coaxial line. Gas pressure is varied from 1 to 19 bar. The homogeneous field gap has an opening from ca. 0.2 to 0.9 mm, and flashover voltages reach 120 kV. Measurements are performed using a D-dot probe with 16 to 20 GHz real-time oscilloscopes and a 50 GHz sampling oscilloscope. Measured risetimes are down to ca. 50 ps, and the dependence of voltage collapse on gas density and electric field between the electrodes is reported. Integrity of data is analyzed and experimental results are compared with present theory found in literature and previous results measured with alternative real-time systems.

Original languageEnglish
Pages (from-to)1004-1006
Number of pages3
JournalActa Physica Polonica A
Issue number6
Publication statusPublished - Jun 2009
MoE publication typeA1 Journal article-refereed


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