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|Title:||Unified empirical model for collective oscillations of asymmetric positive space charge sheath|
Dwivedi, C B
Upadhyaya, J C
|Abstract:||Hypothesis for a comprehensible unification of the previous physical models for the collective oscillation dynamics and its driving mechanism for an asymmetric positive space charge sheath has been proposed. Under diode- like circuit approximations of the sheath , the asymmetry driven beam-plasma interaction model provides a source mechanism to produce an internal rf resonator to transform the diode- like sheath into a system of an active oscillator. The LCR components and the resonant frequency of the equivalent diode-like circuit of the sheath are estimated for real experimental plasma parameters. The numerical values of the resonant eigen frequency of the equivalent circuit for different grid biasing voltages are validated against the real experimental values within some error limit. The resonant eigen frequency agrees well with that of the intern al rf source of ion beam-plasma model origin.|
|ISSN:||0975-1041 (Online); 0019-5596 (Print)|
|Appears in Collections:||IJPAP Vol.40(01) [January 2002]|
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