Heating mechanisms for electron swarms in radio-frequency electric and magnetic fields

Dujko, S., Bošnjaković, D., White, R.D., and Petrović, Z Lj. (2015) Heating mechanisms for electron swarms in radio-frequency electric and magnetic fields. Plasma Sources Science and Technology, 24 (5). 054006. pp. 1-13.

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Starting from analytical and numerical solutions of the equation for collisionless motion of a single electron in time-varying electric and magnetic fields, we investigate the possible mechanisms for power absorption of electron swarms in neutral gases. A multi term theory for solving the Boltzmann equation is used to investigate the power absorption of electrons in radio-frequency (rf) electric and magnetic fields in collision-dominated regime for Reid's inelastic ramp model gas and molecular oxygen. It is found that the effect of resonant absorption of energy in oscillating rf electric and magnetic fields observed under conditions when collisions do not occur, carries directly over to the case where collisions control the swarm behavior. In particular, we have observed the periodic structures in the absorbed power versus amplitude of the applied rf magnetic field curve which have a physical origin similar to the oscillatory phenomena observed for collisionless electron motion. The variation of the absorbed power and other transport properties with the field frequency and field amplitudes in varying configurations of rf electric and magnetic fields is addressed using physical arguments.

Item ID: 42970
Item Type: Article (Research - C1)
ISSN: 1361-6595
Keywords: electron heating; Boltzmann equation; transport coefficients; electron swarms
Funders: Australian Research Council (ARC), MPNTRRS
Projects and Grants: MPNTRRS Project OI171037, MPNTRRS Project III41011
Date Deposited: 07 Mar 2016 00:04
FoR Codes: 02 PHYSICAL SCIENCES > 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics > 020201 Atomic and Molecular Physics @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 100%
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