Multiplying probe for accurate power measurements on an RF driven atmospheric pressure plasma jet applied to the COST reference microplasma jet

Abstract

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Predicting power–voltage characteristics and mode transitions in the COST reference microplasma jet

“…COST reference microplasma jet (COST jet) [2,15,16] is a prototype jet developed by the COST (COoperation in Science and Technology) Action MP1101 on 'Biomedical Applications of Atmospheric Pressure Plasmas' in order to play the role of a reference source in the field of plasma medicine, i.e. a source with reproducible and well-understood characteristics.…”

“…For the case of the µ-APPJ, the experimental studies on the modes included measurements of (a) phase resolved emission profiles of pure He for low-and medium-power regimes [46] and for low-and high-power regimes [25,41], (b) PV characteristics of He/O 2 and He/N 2 mixtures [20], (c) currentvoltage characteristics of pure He [25] and (d) time-averaged sheath width [25]. For the case of the COST jet, there are studies with measurements of (a) phase resolved emission profiles of pure He for low-, medium-, and high-power regimes [33], of He/O 2 for low-power [47], and of He/N 2 mixture for low-and medium-power regimes [36], (b) PV characteristics of He/O 2 mixtures [2,15,32,39,48] and pure He [33], and (c) timeaveraged sheath width in pure He discharges [32]. The computational studies, discussing the modes of operation, usually involve the use of an 1D fluid [26,27,41] or a particle-in-cell model [35,36,49] and refer to pure He [35,41], He/N 2 mixtures [27,36,49], and pure Ar [26].…”

“…In this work, the recently developed 2D cross-field plasma model (CFPM) [50] is applied to the COST jet, operating with pure He and He/O 2 mixtures. For the first time in the literature, the computational results (a) are compared quantitatively with experimental measurements of PV characteristics [2,15,20,32,33,48] and the time-averaged sheath width [32] and (b) reproduce the localized onset of γ-mode in the discharge channel, which is experimentally visualized with emission intensity images [33]. Criteria for (a) the extraction of the sheath width and (b) the mode transitions (α-to α-γ mode and α-γ to γ-mode) are formulated.…”

Reproducibility of `COST Reference Microplasma Jets'

“…The plasma has been applied for various applications and additionally advanced tailoring concepts [70][71][72][73][74][75][76][77][78] are been developed and employed for improved control over the reactive species generation and treatments. Improvements on efficient power delivery and electrical characterisation have also been performed [79][80][81]. These detailed characterisations and investigations can help inform future research on the COST jets and also adapted more generally for other atmospheric pressure plasma sources.…”

Electron-impact ionization of the Kr atom

“…Low charge states of Kr have a number of important plasma applications. For low temperature plasmas these include biomedical plasmas [1] and Hall thrusters [2]. For high temperature plasmas these include edge plasma coolants [3].…”