Study of the prebreakdown stage of a gas discharge in a diode with point cathode by laser probing


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The prebreakdown stage of a gas discharge in a diode with strongly overloaded cathode is studied by laser methods (by simultaneous use of multiframe interferometry and shadow and schlieren photographing) at atmospheric pressure. The spatial resolution of the methods is about 20 μm. A probing pulse of a laser (LS-2151 Nd: YAG laser with a half amplitude duration of 70 ps and a pulse energy of up to 40 mJ) is synchronized with a voltage pulse with accuracy of about 1 ns. High field strength at the cathode is achieved due to the use of thin individual metal tips on the electrodes. It is shown that the initial stage of breakdown of a discharge gap is accompanied by the emergence of a dense plasma cloud at the end of a tip with electron density of about 5 × 1019 cm–3 with a size of tens of microns, as well as by a sharp increase in the total current through the diode. After the emergence of a dense plasma cloud at the end of a cathode tip, a similar cloud is formed on the surface of the anode; sometime later, these clouds join together and form a tubular current channel. The dynamics of the breakdown, as well as the parameters of the plasma are studied by the abovementioned techniques in three independent optical channels.

作者简介

E. Parkevich

Lebedev Physical Institute; Moscow Institute of Physics and Technology

编辑信件的主要联系方式.
Email: parkevich@phystech.edu
俄罗斯联邦, Leninskii pr. 53, Moscow, 119991; Dolgoprudny, Moscow oblast, 141700

S. Tkachenko

Moscow Institute of Physics and Technology

Email: parkevich@phystech.edu
俄罗斯联邦, Dolgoprudny, Moscow oblast, 141700

A. Agafonov

Lebedev Physical Institute; National Nuclear Research University MEPhI

Email: parkevich@phystech.edu
俄罗斯联邦, Leninskii pr. 53, Moscow, 119991; Kashirskoe sh. 31, Moscow, 115409

A. Mingaleev

Lebedev Physical Institute

Email: parkevich@phystech.edu
俄罗斯联邦, Leninskii pr. 53, Moscow, 119991

V. Romanova

Lebedev Physical Institute

Email: parkevich@phystech.edu
俄罗斯联邦, Leninskii pr. 53, Moscow, 119991

T. Shelkovenko

Lebedev Physical Institute

Email: parkevich@phystech.edu
俄罗斯联邦, Leninskii pr. 53, Moscow, 119991

S. Pikuz

Lebedev Physical Institute

Email: parkevich@phystech.edu
俄罗斯联邦, Leninskii pr. 53, Moscow, 119991

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