Abstract
The results of two-dimensional modelling of positive streamerdynamics in 2 cm point-to-plane gap are presented, including the process ofphotoionization in a gas volume. The model of photoionization in air,developed by Zhelezniak, Mnatsakanian and Sizykh is considered in detail and acomparison with the experimental data of Penney and Hummert is presented. Themodel of photoionization in nitrogen, based on the data of Penney and Hummertis described. The simulations of streamers were performed for air andnitrogen-like gas. It is shown, that fundamental space scale of streamer - thewidth of space charge layer lρ (ionization domain) around its head isdefined by the length of absorption of photoionizing radiation la. Thislength defines all other parameters: electron density, radius of streamerchannel etc, so one may speak about standard streamer in air, whose propertiesdepend only on pressure. Based on simulation results one may assume thatstreamer branching occurs in high field, when lρ exceeds la. Theprocess of branching may be interpreted as an instability which transforms thenon-standard streamer into a number of standard ones.
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