Ion kinetics and nonlinear saturation of current-driven instabilities relevant to hollow cathode plasmas
Open accessAbstract
Abstract Ion kinetics and time evolution of bulk plasma properties in the nonlinear saturation regime of a collisionless current-driven instability are studied using a 1D Vlasov–Poisson simulation. In the simulations, the ratio of initial electron bulk velocity to initial electron thermal velocity, called the electron Mach number, ranges from 0.5 to 2.5, and electron-to-ion temperature ratio is 10. A significant population of backstreaming high-energy ions is observed when the initial electron Mach number is larger than or equal to 1.3, which agrees with previous literature indicating transition to the Buneman instability. The simulations suggest that the electrons trapped in large-amplitude waves result in a bi-directional ion acoustic wave, which generates a backward-propagating high-energy ion distribution. A concise formula that describes the high-energy ion distribution and potential fluctuation amplitude are obtained as a function of initial electron Mach numbers. Sputtering rate calculations using the non-Maxwellian distributions for ions obtained from the simulation and Maxwellian ion distributions of temperatures ranging from 0.5 to 4.0 eV are compared, illustrating the potential contribution of kinetic effects on cathode erosion.
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When the feedback of the plasma on the field is important, it is necessary to solve for the full E and B fields from the complete set of Maxwell's equations without making any approximations.
“When the feedback of the plasma on the field is important, it is necessary to solve for the full E and B fi elds from the complete set of Maxwell's equations without making any approximations 121-127 .”
From Plasma propulsion modeling with particle-based algorithms (2023) · cites this paper as [127]
The Introduction says the study assumes one-dimensional, electrostatic conditions, and §3 describes calculating the electric field with the Vlasov–Poisson model. Our copy does not address the claim that important plasma-to-field feedback requires the full, unapproximated Maxwell equations; the paper's use of an approximation does not by itself refute that conditional claim. (LLM, conf=0.72)
Experimental — accuracy not yet measuredIn Ref. 127, it was explicitly demonstrated that electron power absorption occurs in the Doppler-broadened resonance zone, where electrons gain perpendicular energy.
“In particular, in Ref. 127, it was explicitly demonstrated that the electron power absorption indeed occurs in the Doppler-broadened resonance zone, where electrons gain perpendicular energy.”
From Plasma propulsion modeling with particle-based algorithms (2023) · cites this paper as [127]
Section 4.2.2 discusses electron trapping around the phase velocity, and Section 4.3 reports an increase in electron temperature. Neither passage identifies a Doppler-broadened resonance zone, measures electron power absorption there, or says electrons gain perpendicular energy. Searches for those terms returned no passage addressing the claimed mechanism; page numbers were unavailable in our copy. (LLM, conf=0.76)
Experimental — accuracy not yet measuredA second peak far from the ECR region was observed on the profile of the electron mean perpendicular energy.
“Surprisingly, a second peak far from the ECR region was observed on the profile of the electron mean perpendicular energy.”
From Plasma propulsion modeling with particle-based algorithms (2023) · cites this paper as [127]
Sections 4.2.2 and 4.4 discuss current-driven instabilities, ion energy distributions, and potential fluctuations, but do not describe a spatial profile of electron mean perpendicular energy. Searches for the ECR region, a second peak, and electron cyclotron resonance returned no passage addressing the claimed observation. (LLM, conf=0.76)
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Cites
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Cross-field electron diffusion due to the coupling of drift-driven microinstabilities
Hara, K., & Tsikata, S. (2020) · Physical Review E · doi:10.1103/physreve.102.023202 · Cited by 64 · see citing works
Self-citationPlasma propulsion modeling with particle-based algorithms
Taccogna, F., Cichocki, F., Eremin, D., Fubiani, G., & Garrigues, L. (2023) · Journal of Applied Physics · doi:10.1063/5.0153862 · Cited by 29 · see citing works
- Authors
- Hara, K., & Treece, C.
- Affiliations
- Texas A&M University (US)
- Corresponding author
- Hara, Kentaro
- ORCID
- Hara, Kentaro
- Venue
- Plasma Sources Science and Technology
- Publisher
- IOP Publishing
- Published
- 2019-05-01
- Volume
- 28
- Issue
- 5
- Pages
- 055013
- ISSN
- 0963-0252 (ISSN-L)
- 1361-6595
- OpenAlex
- W2935837702
- Cited by
- 36
- References
- 1
- Citations by year
- 2026: 5 · 2025: 4 · 2024: 9 · 2023: 7 · 2022: 1 · 2021: 4 · 2020: 5 · 2019: 1
- FWCI
- 0.99
- Type
- journal article
- Language
- en
- Open access
- green
- www.osti.gov
- Licence
- Locations
- Plasma Sources Science and Technology (publishedVersion)
- OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
- Funders
- Japan Aerospace Exploration Agency
- Fusion Energy Sciences (DE-SC0019045)
- Air Force Office of Scientific Research (FA9550-18-1-0090)
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Plasma Diagnostics and Applications
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Dust and Plasma Wave Phenomena
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Vacuum and Plasma Arcs
- Keywords
- current instability, nonlinear saturation, collisionless plasma, ion kinetics, Buneman instability, backstreaming ions, ion acoustic waves, potential fluctuations, sputtering rate, cathode erosion, hollow cathode plasma, non-Maxwellian ion distribution, Vlasov-Poisson simulation
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