On beat-driven and spontaneous excitations of zonal flows by drift waves
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arXiv
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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866929240857903104 |
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| author | Chen, Liu Qiu, Zhiyong Zonca, Fulvio |
| author_facet | Chen, Liu Qiu, Zhiyong Zonca, Fulvio |
| contents | Using the slab plasma as a paradigm model, we have derived analytically equations for the nonlinear generation of zero-frequency zonal flows by electron drift waves including, on the same footing, both the beat-driven and spontaneous excitations. It is found that the beat-driven zonal flow tends to reduce the frequency mismatch between the electron drift waves and, thereby, contributes to a significant O(1) enhancement of the modulational instability drive and lowering its threshold. Implications to tokamaks plasmas as well as drift-wave soliton formation are also discussed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_07399 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | On beat-driven and spontaneous excitations of zonal flows by drift waves Chen, Liu Qiu, Zhiyong Zonca, Fulvio Plasma Physics Using the slab plasma as a paradigm model, we have derived analytically equations for the nonlinear generation of zero-frequency zonal flows by electron drift waves including, on the same footing, both the beat-driven and spontaneous excitations. It is found that the beat-driven zonal flow tends to reduce the frequency mismatch between the electron drift waves and, thereby, contributes to a significant O(1) enhancement of the modulational instability drive and lowering its threshold. Implications to tokamaks plasmas as well as drift-wave soliton formation are also discussed. |
| title | On beat-driven and spontaneous excitations of zonal flows by drift waves |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2402.07399 |