Nonlinear skin effect regime when a radio frequency electromagnetic field penetrates into a background plasma
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866913935469314048 |
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| author | Sun, Haomin Chen, Jian Khrabrov, Alexander Kaganovich, Igor D. Yang, Wei Sydorenko, Dmytro Brunner, Stephan |
| author_facet | Sun, Haomin Chen, Jian Khrabrov, Alexander Kaganovich, Igor D. Yang, Wei Sydorenko, Dmytro Brunner, Stephan |
| contents | Two-dimensional, electromagnetic particle-in-cell simulations are employed to study particle kinetics and power deposition in the skin layer when a Radio Frequency (RF) electromagnetic field penetrates into a background plasma. We identify a new regime at low frequency ($\sim\mathrm{MHz}$) and low pressure, where the motion of electrons can be highly nonlinear in the skin region. Through most of the RF cycle, the electrons are trapped in the effective potential formed by the vector and electrostatic potentials, with energy deposition being small and magnetic moment $μ$ no longer being an adiabatic invariant. However, for a brief period around the null of the oscillating magnetic field, the electrons get detrapped, causing a jet-like current penetrating into the bulk plasma. During these brief periods, the power deposition becomes high, exhibiting a periodic burst nature. Based on kinetic theory, we provide analytical expressions for the plasma current and energy deposition in the new regime. A criterion for transition between the newly identified low-frequency, periodic-burst regime and the usual anomalous non-local skin effect regime is proposed and verified. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_03508 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Nonlinear skin effect regime when a radio frequency electromagnetic field penetrates into a background plasma Sun, Haomin Chen, Jian Khrabrov, Alexander Kaganovich, Igor D. Yang, Wei Sydorenko, Dmytro Brunner, Stephan Plasma Physics Applied Physics Two-dimensional, electromagnetic particle-in-cell simulations are employed to study particle kinetics and power deposition in the skin layer when a Radio Frequency (RF) electromagnetic field penetrates into a background plasma. We identify a new regime at low frequency ($\sim\mathrm{MHz}$) and low pressure, where the motion of electrons can be highly nonlinear in the skin region. Through most of the RF cycle, the electrons are trapped in the effective potential formed by the vector and electrostatic potentials, with energy deposition being small and magnetic moment $μ$ no longer being an adiabatic invariant. However, for a brief period around the null of the oscillating magnetic field, the electrons get detrapped, causing a jet-like current penetrating into the bulk plasma. During these brief periods, the power deposition becomes high, exhibiting a periodic burst nature. Based on kinetic theory, we provide analytical expressions for the plasma current and energy deposition in the new regime. A criterion for transition between the newly identified low-frequency, periodic-burst regime and the usual anomalous non-local skin effect regime is proposed and verified. |
| title | Nonlinear skin effect regime when a radio frequency electromagnetic field penetrates into a background plasma |
| topic | Plasma Physics Applied Physics |
| url | https://arxiv.org/abs/2503.03508 |