Sawtooth behavior of EAST plasma under ICRF heating
BackgroundSawtooth oscillations are macroscopic instabilities in plasma. To better control the sawtooth oscillation in an advanced experimental superconducting tokamak (EAST) device, it is necessary to develop sawtooth controlling methods that help improve the confined performance of plasma in the E...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | zho |
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Science Press
2023-01-01
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| Series: | He jishu |
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| Online Access: | https://www.hjs.sinap.ac.cn/thesisDetails#10.11889/j.0253-3219.2023.hjs.46.010502&lang=zh |
| _version_ | 1811169638945390592 |
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| author | WEN Xiaodong XU Liqing HU Liqun LIU Haiqing DUAN Yanmin CHU Yuqi ZHONG Guoqiang ZHANG Wei ZHANG Xinjun MAI Chaowei |
| author_facet | WEN Xiaodong XU Liqing HU Liqun LIU Haiqing DUAN Yanmin CHU Yuqi ZHONG Guoqiang ZHANG Wei ZHANG Xinjun MAI Chaowei |
| author_sort | WEN Xiaodong |
| collection | DOAJ |
| description | BackgroundSawtooth oscillations are macroscopic instabilities in plasma. To better control the sawtooth oscillation in an advanced experimental superconducting tokamak (EAST) device, it is necessary to develop sawtooth controlling methods that help improve the confined performance of plasma in the EAST device.PurposeThis study aims to analyze sawtooth behavior under the on-axis heating by ion cyclotron resonance frequency (ICRF) wave in the EAST device.MethodsFirst of all, the soft X-ray integrated signal intensity data was used to analyze the sawtooth period and amplitude. The radius of q=1 surface and the plasma pressure gradient at q=1 surface were calculated using a soft X-ray intensity profile. Then the neutron yield flux was obtained from the neutron yield flux diagnostic data. Finally, the equilibrium reconstruction results of the equilibrium fitting algorithm (EFIT) were combined with polarimeter-interferometer (POINT) diagnostic data to investigate the relationship between the variation of ICRF and plasma current density.ResultsExperimental results show that the sawtooth period is positively correlated with the ICRF power, and the variation in sawtooth period is roughly same as that in sawtooth amplitude and plasma pressure gradient at q=1 surface. The ICRF power needs to exceed 0.8 MW to change the radius of q=1 surface. The sawtooth period and q=1 surface with ICRF power change are more sensitive under solely ICRF heating than under ICRF+lower hybrid wave (LHW)+electron cyclotron resonance heating (ECRH).ConclusionsSawtooth behavior of EAST plasma is affected by the fast ions produced by ICRF and the radius change of q=1 surface. |
| first_indexed | 2024-04-10T16:45:36Z |
| format | Article |
| id | doaj.art-8f4c36b141da4ed4a6e5a8985d3bba57 |
| institution | Directory Open Access Journal |
| issn | 0253-3219 |
| language | zho |
| last_indexed | 2024-04-10T16:45:36Z |
| publishDate | 2023-01-01 |
| publisher | Science Press |
| record_format | Article |
| series | He jishu |
| spelling | doaj.art-8f4c36b141da4ed4a6e5a8985d3bba572023-02-08T01:05:38ZzhoScience PressHe jishu0253-32192023-01-0146101050201050210.11889/j.0253-3219.2023.hjs.46.0105020253-3219（2023）01-0073-09Sawtooth behavior of EAST plasma under ICRF heatingWEN Xiaodong0XU Liqing1HU Liqun2LIU Haiqing3DUAN Yanmin4CHU Yuqi5ZHONG Guoqiang6ZHANG Wei7ZHANG Xinjun8MAI Chaowei9Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, ChinaInstitute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, ChinaInstitute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, ChinaInstitute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, ChinaInstitute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, ChinaInstitute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, ChinaInstitute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, ChinaInstitute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, ChinaInstitute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, ChinaInstitute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, ChinaBackgroundSawtooth oscillations are macroscopic instabilities in plasma. To better control the sawtooth oscillation in an advanced experimental superconducting tokamak (EAST) device, it is necessary to develop sawtooth controlling methods that help improve the confined performance of plasma in the EAST device.PurposeThis study aims to analyze sawtooth behavior under the on-axis heating by ion cyclotron resonance frequency (ICRF) wave in the EAST device.MethodsFirst of all, the soft X-ray integrated signal intensity data was used to analyze the sawtooth period and amplitude. The radius of q=1 surface and the plasma pressure gradient at q=1 surface were calculated using a soft X-ray intensity profile. Then the neutron yield flux was obtained from the neutron yield flux diagnostic data. Finally, the equilibrium reconstruction results of the equilibrium fitting algorithm (EFIT) were combined with polarimeter-interferometer (POINT) diagnostic data to investigate the relationship between the variation of ICRF and plasma current density.ResultsExperimental results show that the sawtooth period is positively correlated with the ICRF power, and the variation in sawtooth period is roughly same as that in sawtooth amplitude and plasma pressure gradient at q=1 surface. The ICRF power needs to exceed 0.8 MW to change the radius of q=1 surface. The sawtooth period and q=1 surface with ICRF power change are more sensitive under solely ICRF heating than under ICRF+lower hybrid wave (LHW)+electron cyclotron resonance heating (ECRH).ConclusionsSawtooth behavior of EAST plasma is affected by the fast ions produced by ICRF and the radius change of q=1 surface.https://www.hjs.sinap.ac.cn/thesisDetails#10.11889/j.0253-3219.2023.hjs.46.010502&lang=zheast tokamakion cyclotron resonance frequency (icrf)sawtooth oscillation |
| spellingShingle | WEN Xiaodong XU Liqing HU Liqun LIU Haiqing DUAN Yanmin CHU Yuqi ZHONG Guoqiang ZHANG Wei ZHANG Xinjun MAI Chaowei Sawtooth behavior of EAST plasma under ICRF heating He jishu east tokamak ion cyclotron resonance frequency (icrf) sawtooth oscillation |
| title | Sawtooth behavior of EAST plasma under ICRF heating |
| title_full | Sawtooth behavior of EAST plasma under ICRF heating |
| title_fullStr | Sawtooth behavior of EAST plasma under ICRF heating |
| title_full_unstemmed | Sawtooth behavior of EAST plasma under ICRF heating |
| title_short | Sawtooth behavior of EAST plasma under ICRF heating |
| title_sort | sawtooth behavior of east plasma under icrf heating |
| topic | east tokamak ion cyclotron resonance frequency (icrf) sawtooth oscillation |
| url | https://www.hjs.sinap.ac.cn/thesisDetails#10.11889/j.0253-3219.2023.hjs.46.010502&lang=zh |
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