Evolution of turbulence and transport in EAST H-mode plasmas with <i>T</i> <sub>e</sub> / <i>T</i> <sub>i</sub> ∼ 1
Abstract The enhanced heat transport in ion channel is observed as the temperature ratio T e / T i increased from 1.0 to 2.2 in Experimental Advanced Superconducting Tokamak H-mode plasmas. Electron cyclotron resonance heating (ECRH) was applied to modulate T e / T i within the range T e / T i <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:mtext>⩾</mml:mtext> <mml:mn>1</mml:mn> </mml:mrow> </mml:math> expected for ITER where electron heating is dominant. The ONETWO code presents increased ion thermal diffusivity. Trapped-Gyro–Landau-Fluid and Numerical Lie Transform simulations imply the development of TEM together with the reduction of ITG as T e / T i increases. The reduction of ITG driven turbulence was supported by weakened density fluctuations measured by the poloidal correlation reflectometer (PCR). Conversely, after the removal of ECRH power, the behavior of turbulence also reverses. When T e / T i reduces following the removal of ECRH power, PCR shows enhanced density fluctuations. The results from upgraded Collective Thomson Scattering diagnostics (CTS) shows simultaneously enhanced low- k ( k <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:mo>∼</mml:mo> <mml:mn>5</mml:mn> <mml:mstyle scriptlevel="0"/> <mml:mrow> <mml:mtext>c</mml:mtext> </mml:mrow> <mml:mrow> <mml:msup> <mml:mrow> <mml:mtext>m</mml:mtext> </mml:mrow> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:mrow> </mml:mrow> </mml:math> ) fluctuations and weakened intermediate- k ( k <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:mo>∼</mml:mo> <mml:mn>20</mml:mn> <mml:mstyle scriptlevel="0"/> <mml:mrow> <mml:mtext>c</mml:mtext> </mml:mrow> <mml:mrow> <mml:msup> <mml:mrow> <mml:mtext>m</mml:mtext> </mml:mrow> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:mrow> </mml:mrow> </mml:math> ) fluctuations as T e / T i decreases. This study broadens the comprehension of evolution of turbulence and ion heat transport within the temperature ratio range T e / T i <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:mtext>⩾</mml:mtext> <mml:mn>1</mml:mn> </mml:mrow> </mml:math> .0, which is likely to occur in future tokamak like ITER.
Authors
- J.P. Qian (ORCID: https://orcid.org/0000-0002-2646-6509)
- Muquan Wu (ORCID: https://orcid.org/0000-0003-0703-0096)
- Zichao Lin (ORCID: https://orcid.org/0000-0002-2417-8191)
- Yuyang He (ORCID: https://orcid.org/0000-0001-6962-9286)
- Lei Ye (ORCID: https://orcid.org/0000-0002-6505-6625)
- Shouxin Wang (ORCID: https://orcid.org/0000-0001-9600-4038)
- Gongshun Li (ORCID: https://orcid.org/0000-0002-5542-1238)
- Weiye Xu (ORCID: https://orcid.org/0000-0003-2731-0351)
- Kangning Geng (ORCID: https://orcid.org/0000-0001-7808-0192)
- Xiang Jian (ORCID: https://orcid.org/0000-0003-3052-1694)
- Tao Zhang (ORCID: https://orcid.org/0000-0002-1555-6226)
- Xincheng Wang (ORCID: https://orcid.org/0000-0003-0792-0005)
- Jiale Chen (ORCID: https://orcid.org/0000-0003-1781-9744)
- Pan Li (ORCID: https://orcid.org/0009-0006-7304-2721)
- Hailin Zhao (ORCID: https://orcid.org/0000-0002-4736-5897)
- Wei Zhang (ORCID: https://orcid.org/0000-0002-5951-6779)
- Xianzu Gong
Institutions
- Institute of Plasma Physics (CN)
Publication Details
- Journal
- Nuclear Fusion
- Published
- 2025-10-08
- DOI
- https://doi.org/10.1088/1741-4326/ae1047
- Primary Topic
- Magnetic confinement fusion research
- Type
- article
- Field-Weighted Citation Impact
- 0.00