Suppression of core temperature fluctuations by edge cooling in the J-TEXT tokamak
Abstract The suppression of core temperature fluctuations due to edge cooling in the J-TEXT tokamak is presented. The supersonic molecular beam is injected into the low density plasmas and the core temperature rise appears. The staggered time correlation technique is utilized to infer the temperature fluctuations from an electron cyclotron emission radiometer (ECE). The existing correlation ECE (CECE) also enables the observation of the temperature fluctuations simultaneously. A significant flattening of the density gradients appears almost in the whole plasmas after the cold pulse injection. The behaviors of the temperature fluctuations from both ECE and CECE show a good agreement, except for the fluctuation level, which exhibits a relative variation of approximately 10% <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:mo>−</mml:mo> </mml:mrow> </mml:math> 50%. The relative intensity of temperature fluctuations decreases within the surface of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:mi>r</mml:mi> <mml:mrow> <mml:mo>/</mml:mo> </mml:mrow> <mml:mi>a</mml:mi> <mml:mo>∼</mml:mo> </mml:mrow> </mml:math> 0.8 due to the edge cooling. The cross-power analysis and the agreement in measurements suggest that temperature fluctuations from turbulence inferred from a single ECE channel may be possible. Linear simulations suggest the drop in temperature fluctuation intensity may relate to the trapped electron mode turbulence stabilization. This paper also demonstrates the evolution of both gradients and fluctuations before and after supersonic molecular beam injection with density scans.
Authors
- Li Gao (ORCID: https://orcid.org/0000-0001-5758-3516)
- Yuqian Chen (ORCID: https://orcid.org/0000-0003-0557-4989)
- Yuejiang Shi
- Nengchao Wang (ORCID: https://orcid.org/0000-0001-6797-2398)
- Zhoujun Yang (ORCID: https://orcid.org/0000-0002-9141-7869)
- J.Q. Xu (ORCID: https://orcid.org/0000-0003-4834-3005)
- Jiaqi Dong (ORCID: https://orcid.org/0000-0002-2062-3040)
- Muzhi Tan (ORCID: https://orcid.org/0009-0006-0415-4412)
- J. Cheng (ORCID: https://orcid.org/0000-0002-0496-5542)
- Zhongyong Chen (ORCID: https://orcid.org/0000-0002-8934-0364)
- Guoshu Zhang (ORCID: https://orcid.org/0009-0005-5873-4749)
- Y. Liang (ORCID: https://orcid.org/0000-0002-9483-6911)
- Huaiqiang Zhang (ORCID: https://orcid.org/0000-0001-9333-8585)
- Zhipeng Chen (ORCID: https://orcid.org/0000-0002-8330-0070)
- Lu Wang (ORCID: https://orcid.org/0000-0002-5881-6139)
- K.J. Zhao (ORCID: https://orcid.org/0000-0003-0683-5060)
- Yong Hua Ding (ORCID: https://orcid.org/0000-0001-8225-1839)
- Lin Xiang (ORCID: https://orcid.org/0009-0009-1401-6904)
- Jinyu Zhang (ORCID: https://orcid.org/0009-0002-2399-8072)
- Junjie Du (ORCID: https://orcid.org/0000-0001-8612-5450)
- Ran Li (ORCID: https://orcid.org/0009-0008-0727-3323)
- Xiaogang Cao
- Jia-Ming Jiang (ORCID: https://orcid.org/0009-0007-5420-4059)
- Yaoyu Xie (ORCID: https://orcid.org/0009-0000-0026-2420)
Institutions
- Forschungszentrum Jülich (DE)
- ENN (China) (CN)
- East China University of Technology (CN)
- Southwestern Institute of Physics (CN)
- Huazhong University of Science and Technology (CN)
- Southwest Jiaotong University (CN)
Publication Details
- Journal
- Plasma Physics and Controlled Fusion
- Published
- 2024-11-21
- DOI
- https://doi.org/10.1088/1361-6587/ad95ba
- Citations
- 2
- Primary Topic
- Magnetic confinement fusion research
- Type
- article
- Field-Weighted Citation Impact
- 1.32
Funders
- National Natural Science Foundation of China
- Natural Science Foundation of Jiangxi Province