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Particle-in-Cell Simulations With Fluid Metastable Atoms in Capacitive Argon Discharges : Electron Elastic Scattering and Plasma Density Profile Transition
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Wen, D. -Q (författare)
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Krek, J. (författare)
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- Gudmundsson, Jon Tomas, 1965- (författare)
- KTH,Rymd- och plasmafysik,Science Institute, University of Iceland, Reykjavik, Iceland
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Kawamura, E. (författare)
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Lieberman, M. A. (författare)
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Verboncoeur, J. P. (författare)
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(creator_code:org_t)
- Institute of Electrical and Electronics Engineers (IEEE), 2022
- 2022
- Engelska.
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Ingår i: IEEE Transactions on Plasma Science. - : Institute of Electrical and Electronics Engineers (IEEE). - 0093-3813 .- 1939-9375. ; 50:9, s. 2548-2557
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Particle-in-cell/Monte Carlo collision (PIC/MCC) simulations are an important tool for understanding low-temperature plasma dynamics, and benchmark work is needed to build a solid base for the correctness of PIC/MCC codes. In our recent publication (Wen et al., 2021), benchmarking of the object-oriented PIC/MCC oopd1 code was performed against the well-established xpdp1 code for a simplified argon reaction set. Furthermore, oopd1 was upgraded to incorporate the excited state atoms as space- and time-varying fluids. Here, we show more details and perform further analysis of the benchmark work. The plasma density profile transition is further explored; the 'passively' flat plasma density profile in the absence of metastables is found to be parabolic at low pressure and flat at 1.6 and 5 Torr. In the presence of metastable atoms, the 'parabolic' profile at 5 Torr becomes 'flat' at 15 Torr due to the reduced excited state atom density in the discharge center, which decreases the step-wise ionization rates. In addition, the effects of electron elastic scattering, i.e., Coulomb-screening-based non-isotropic scattering, total elastic (and momentum transfer) cross-section-dependent non-isotropic scattering, and momentum transfer isotropic scattering on capacitive discharges, are examined, showing that at a low pressure of 50 mTorr Coulomb-screening-based scattering underestimates the plasma density and electron power absorption by around 15%. However, isotropic scattering and cross-section-dependent non-isotropic scattering give almost the same plasma density and electron power absorption. At a higher pressure of 1.6 Torr, the plasma properties are independent of electron scattering in the presence of metastable atoms. In the absence of metastable atoms, different electron scattering treatments bring a few percent difference for plasma density and electron power absorption.
Ämnesord
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Nyckelord
- Axial plasma density profile transition
- Coulomb screening
- electron elastic scattering
- isotropic and non-isotropic scattering
- particle-in-cell/Monte Carlo collisions (PIC/MCCs)
- treating neutrals as a space- and time-varying fluid
- Argon
- Atoms
- Codes (symbols)
- Collisional plasmas
- Dynamics
- Electron scattering
- Electrons
- Excited states
- Plasma density
- Plasma diagnostics
- Plasma simulation
- Temperature
- Code
- Density profile
- Discharge (electric)
- Isotropics
- Monte Carlo collision
- Non-isotropic scatterings
- Particle in cell
- Particle-in-cell/monte carlo collision
- Space and time
- Time varying
- Treating neutral as a space- and time-varying fluid.
- Electric discharges
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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