Investigation of positive streamers in CO$_2$: experiments and 3D particle-in-cell simulations
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
| Publié: |
2023
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| _version_ | 1866910657460305920 |
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| author | Li, Xiaoran Dijcks, Siebe Sun, Anbang Nijdam, Sander Teunissen, Jannis |
| author_facet | Li, Xiaoran Dijcks, Siebe Sun, Anbang Nijdam, Sander Teunissen, Jannis |
| contents | We investigate the propagation of positive streamers in CO$_2$ through 3D particle-in-cell simulations, which are qualitatively compared against experimental results at 50 mbar. The experiments show that CO$_2$ streamers are much more stochastic than air streamers at the same applied voltage, indicating that few electrons are available in front of the streamer head. In the simulations, we include a photoionization model for CO$_2$. The computational results show that even a small amount of photoionization can sustain positive streamer propagation, but this requires a background electric field close to the critical field. When we compare streamers in CO$_2$ and in air at the same applied voltage, the electric field at the streamer head and the electron density in the streamer channel are higher in CO$_2$. We discuss the uncertainties in CO$_2$ photoionization and provide an estimate for the quenching pressure, which is based on the radiative lifetime of emitting states and the collision frequency of the gas. Furthermore, a criterion for self-sustained streamer growth in CO$_2$ is presented and compared against simulation results. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2304_01531 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Investigation of positive streamers in CO$_2$: experiments and 3D particle-in-cell simulations Li, Xiaoran Dijcks, Siebe Sun, Anbang Nijdam, Sander Teunissen, Jannis Plasma Physics We investigate the propagation of positive streamers in CO$_2$ through 3D particle-in-cell simulations, which are qualitatively compared against experimental results at 50 mbar. The experiments show that CO$_2$ streamers are much more stochastic than air streamers at the same applied voltage, indicating that few electrons are available in front of the streamer head. In the simulations, we include a photoionization model for CO$_2$. The computational results show that even a small amount of photoionization can sustain positive streamer propagation, but this requires a background electric field close to the critical field. When we compare streamers in CO$_2$ and in air at the same applied voltage, the electric field at the streamer head and the electron density in the streamer channel are higher in CO$_2$. We discuss the uncertainties in CO$_2$ photoionization and provide an estimate for the quenching pressure, which is based on the radiative lifetime of emitting states and the collision frequency of the gas. Furthermore, a criterion for self-sustained streamer growth in CO$_2$ is presented and compared against simulation results. |
| title | Investigation of positive streamers in CO$_2$: experiments and 3D particle-in-cell simulations |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2304.01531 |