Observation of plasma performance improvement by edge ECRH power deposition on Experimental Advanced Superconducting Tokamak
Abstract Edge electron cyclotron current drive (ECCD) has been observed to enhance plasma performance on the Experimental Advanced Superconducting Tokamak. By adjusting the ECCD mirror, the power deposition was shifted from the core to the edge region during H-mode operation. This edge ECCD deposition resulted in a reduction of plasma density and tungsten impurity, while simultaneously steepening the electron and ion temperature profiles, thereby improving overall confinement. Correspondingly, the core safety factor increased, leading to the formation of a negative magnetic shear in the core, which is attributed to suppressing the ion temperature gradient (ITG) turbulence, as confirmed by poloidal correlation reflectometry diagnostics. Theoretical simulations indicate the coexistence of density gradient-driven trapped electron mode turbulence in the core ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:mrow> <mml:msub> <mml:mi>ρ</mml:mi> <mml:mi>t</mml:mi> </mml:msub> </mml:mrow> <mml:mo><</mml:mo> <mml:mn>0.45</mml:mn> </mml:mrow> </mml:math> ) and ITG turbulence at the edge ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:mrow> <mml:msub> <mml:mi>ρ</mml:mi> <mml:mi>t</mml:mi> </mml:msub> </mml:mrow> <mml:mo>></mml:mo> <mml:mn>0.45</mml:mn> </mml:mrow> </mml:math> ). Suppression of these turbulences contribute to the enhancement of plasma confinement, which results in a significant reduction of the inward convective velocity of tungsten.
Authors
- Qingquan Yang (ORCID: https://orcid.org/0000-0002-6354-1408)
- Xianzu Gong (ORCID: https://orcid.org/0000-0001-6886-6431)
- Jian Hu (ORCID: https://orcid.org/0000-0003-1967-0875)
- Yuqi Chu (ORCID: https://orcid.org/0000-0002-7379-0117)
- N. Yan (ORCID: https://orcid.org/0000-0002-2536-5853)
- Zichao Lin (ORCID: https://orcid.org/0000-0002-2417-8191)
- Guosheng Xu (ORCID: https://orcid.org/0000-0001-8495-8678)
- Shouxin Wang (ORCID: https://orcid.org/0000-0001-9600-4038)
- Kaixuan Ye
- Gongshun Li (ORCID: https://orcid.org/0000-0002-5542-1238)
- Wenmin Zhang (ORCID: https://orcid.org/0009-0000-9980-6765)
- Liqing Xu (ORCID: https://orcid.org/0009-0003-7340-1083)
- Y. L. Li (ORCID: https://orcid.org/0000-0001-8008-1880)
- Hailin Zhao (ORCID: https://orcid.org/0000-0002-6636-3432)
- Weiye Xu (ORCID: https://orcid.org/0000-0003-2731-0351)
- Yuntao Song (ORCID: https://orcid.org/0000-0002-8029-7558)
- Yifeng Wang (ORCID: https://orcid.org/0000-0002-0368-9566)
- Tao Zhang (ORCID: https://orcid.org/0000-0002-1555-6226)
- Ran Chen (ORCID: https://orcid.org/0000-0002-8967-7258)
- Xiaoliang Li (ORCID: https://orcid.org/0000-0002-2653-652X)
- Rui Ding (ORCID: https://orcid.org/0000-0003-2880-9736)
- Dian Lu
- Shengyu Fu (ORCID: https://orcid.org/0000-0002-5352-9413)
- Yanmin Duan (ORCID: https://orcid.org/0000-0002-5800-0930)
- Zhen Zhou (ORCID: https://orcid.org/0009-0000-8261-7837)
- Ling Zhang (ORCID: https://orcid.org/0000-0002-8778-8704)
- Qing Zang
- Haiqing Liu (ORCID: https://orcid.org/0000-0001-6892-358X)
- Liang Wang (ORCID: https://orcid.org/0000-0002-8373-117X)
- Xiao Lan Zou
Institutions
- Chinese Academy of Sciences (CN)
- Hefei Institutes of Physical Science (CN)
- CEA Cadarache (FR)
- Institute of Plasma Physics (CN)
- FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ)
Publication Details
- Journal
- Nuclear Fusion
- Published
- 2025-10-20
- DOI
- https://doi.org/10.1088/1741-4326/ae1519
- Primary Topic
- Magnetic confinement fusion research
- Type
- article
- Field-Weighted Citation Impact
- 0.00