Numerical Analysis of Electron Runaway in the Presence of Enhanced Field in the Vicinity of a Microtip

Transition of field-emission electrons to the runaway regime in the region of enhanced electric field determined by the configuration of a microtip on a cathode is studied at several pressures of gas medium. The problem is solved using simulation of electron motion in the presence of nonuniform elec...

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Bibliographic Details
Published in:Technical physics 2018-12, Vol.63 (12), p.1872-1875
Main Authors: Lisenkov, V. V., Ivanov, S. N., Mamontov, Yu. I., Tikhonov, I. N.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CATHODES
Classical and Continuum Physics
Computer simulation
COMPUTERIZED SIMULATION
Configurations
ELECTRIC DISCHARGES
ELECTRIC FIELDS
ELECTRON EMISSION
Electron runaway (plasma physics)
Electrons
FIELD EMISSION
MONTE CARLO METHOD
NITROGEN
NUMERICAL ANALYSIS
Physical Electronics
Physics
Physics and Astronomy
Preionization
RUNAWAY ELECTRONS
TWO-DIMENSIONAL SYSTEMS
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Summary:Transition of field-emission electrons to the runaway regime in the region of enhanced electric field determined by the configuration of a microtip on a cathode is studied at several pressures of gas medium. The problem is solved using simulation of electron motion in the presence of nonuniform electric field with the aid of the Monte Carlo procedure in the 2D configuration. Nitrogen is used as a working gas. Passage through a relatively small region of the enhanced field in the vicinity of the microtip may substantially facilitate electron escape to the runaway regime, especially, at pressures of greater than 10 atm. In our opinion, the resulting runaway electrons may provide preionization of gas medium and formation of the initial stage of a 3D discharge.
ISSN:1063-7842
1090-6525
DOI:10.1134/S1063784218120095