Effect of driving voltages in dual capacitively coupled radio frequency plasma: A study by nonlinear global model
On the basis of nonlinear global model, a dual frequency capacitively coupled radio frequency plasma driven by 13.56 MHz and 27.12 MHz has been studied to investigate the influences of driving voltages on the generation of dc selfbias and plasma heating. Fluid equations for the ions inside the plasma sheath have been considered to determine the voltagecharge relations of the plasma sheath. Geometrically symmetric as well as asymmetric cases with finite geometrical asymmetry of 1.2 (ratio of electrodes area) have been considered to make the study more reasonable to experiment. The electrical asymmetry effect (EAE) and finite geometrical asymmetry is found to work differently in controlling the dc selfbias. The amount of EAE has been primarily controlled by the phase angle between the two consecutive harmonics waveforms. The incorporation of the finite geometrical asymmetry in the calculations shift the dc selfbias towards negative polarity direction while increasing the amount of EAE is found to increase the dc selfbias in either direction. For phase angle between the two waveforms ϕ = 0 and ϕ = π/2, the amount of EAE increases significantly with increasing the low frequency voltage, whereas no such increase in the amount of EAE is found with increasing high frequency voltage. In contrast tomore »
 Authors:

^{[1]}
 Comisión Chilena de Energía Nuclear, Santiago, Chile and Center for Research and Applications in Plasma Physics and Pulsed Power, P4, Santiago (Chile)
 Publication Date:
 OSTI Identifier:
 22486472
 Resource Type:
 Journal Article
 Resource Relation:
 Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 10; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ASYMMETRY; ELECTRIC POTENTIAL; ELECTRODES; FLOW MODELS; HARMONICS; IONS; MHZ RANGE; NONLINEAR PROBLEMS; PLASMA HEATING; PLASMA SHEATH; RADIOWAVE RADIATION; SYMMETRY; WAVE FORMS