Mechanism of Runaway Electron Generation at Gas Pressures from a Few Atmospheres to Several Tens of Atmospheres
| Autor: | S. N. Ivanov, N. M. Zubarev |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Physics and Astronomy (miscellaneous) Plasma Electron Condensed Matter Physics 01 natural sciences Space charge Cathode 010305 fluids & plasmas law.invention Ion Depletion region law Ionization 0103 physical sciences Charge carrier Astrophysics::Earth and Planetary Astrophysics Atomic physics Astrophysics::Galaxy Astrophysics |
| Zdroj: | Plasma Physics Reports. 44:445-452 |
| ISSN: | 1562-6938 1063-780X |
| Popis: | The mechanism of runaway electron generation at gas pressures from a few atmospheres to several tens of atmospheres is proposed. According to this mechanism, the electrons pass into the runaway mode in the enhanced field zone that arises between a cathode micropoint—a source of field-emission electrons—and the region of the positive ion space charge accumulated near the cathode in the tails of the developing electron avalanches. As a result, volume gas ionization by runaway electrons begins with a time delay required for the formation of the enhanced field zone. This process determines the delay time of breakdown. The influence of the gas pressure on the formation dynamics of the space charge region is analyzed. At gas pressures of a few atmospheres, the space charge arises due to the avalanche multiplication of the very first field-emission electron, whereas at pressures of several tens of atmospheres, the space charge forms as a result of superposition of many electron avalanches with a relatively small number of charge carriers in each. |
| Databáze: | OpenAIRE |
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