Measurement of zero-frequency fluctuations generated by coupling between Alfven modes in the JET tokamak
Fuente:
arXiv
Guardado en:
| Autores principales: | , , , , , , , , , , , , , , , |
|---|---|
| Formato: | Preprint |
| Publicado: |
2024
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866910791012188160 |
|---|---|
| author | Ruiz, Juan Ruiz Garcia, Jeronimo Barnes, Michael Dreval, Mykola Giroud, Carine Hall-Chen, Valerian H. Hardman, Michael R. Hillesheim, Jon C. Kazakov, Yevgen Mazzi, Samuele Parra, Felix I. Patel, Bhavin S. Schekochihin, Alexander A. Stancar, Ziga Contributors, the JET Team, the EUROfusion Tokamak Exploitation |
| author_facet | Ruiz, Juan Ruiz Garcia, Jeronimo Barnes, Michael Dreval, Mykola Giroud, Carine Hall-Chen, Valerian H. Hardman, Michael R. Hillesheim, Jon C. Kazakov, Yevgen Mazzi, Samuele Parra, Felix I. Patel, Bhavin S. Schekochihin, Alexander A. Stancar, Ziga Contributors, the JET Team, the EUROfusion Tokamak Exploitation |
| contents | We report the first experimental detection of a zero-frequency fluctuation that is pumped by an Alfvèn mode in a magnetically confined plasma. Core-localized bidirectional Alfvèn modes of frequency inside the toroidicity-induced gap (and its harmonics) exhibit three-wave coupling interactions with a zero-frequency fluctuation. The observation of the zero-frequency fluctuation is consistent with theoretical and numerical predictions of zonal modes pumped by Alfvén modes, and is correlated with an increase in the deep core ion temperature, temperature gradient, and confinement factor $H_{89,P}$. Despite the energetic particle transport induced by the Alfvèn eigenmodes, the generation of a zero-frequency fluctuation that can suppress the turbulence leads to an overall improvement of confinement. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_01255 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Measurement of zero-frequency fluctuations generated by coupling between Alfven modes in the JET tokamak Ruiz, Juan Ruiz Garcia, Jeronimo Barnes, Michael Dreval, Mykola Giroud, Carine Hall-Chen, Valerian H. Hardman, Michael R. Hillesheim, Jon C. Kazakov, Yevgen Mazzi, Samuele Parra, Felix I. Patel, Bhavin S. Schekochihin, Alexander A. Stancar, Ziga Contributors, the JET Team, the EUROfusion Tokamak Exploitation Plasma Physics We report the first experimental detection of a zero-frequency fluctuation that is pumped by an Alfvèn mode in a magnetically confined plasma. Core-localized bidirectional Alfvèn modes of frequency inside the toroidicity-induced gap (and its harmonics) exhibit three-wave coupling interactions with a zero-frequency fluctuation. The observation of the zero-frequency fluctuation is consistent with theoretical and numerical predictions of zonal modes pumped by Alfvén modes, and is correlated with an increase in the deep core ion temperature, temperature gradient, and confinement factor $H_{89,P}$. Despite the energetic particle transport induced by the Alfvèn eigenmodes, the generation of a zero-frequency fluctuation that can suppress the turbulence leads to an overall improvement of confinement. |
| title | Measurement of zero-frequency fluctuations generated by coupling between Alfven modes in the JET tokamak |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2407.01255 |