Nuclear Fusion (Jan 2024)
On how structures convey non-diffusive turbulence spreading
- Ting Long,
- P.H. Diamond,
- Rui Ke,
- Zhipeng Chen,
- Mingyun Cao,
- Xin Xu,
- Min Xu,
- Rongjie Hong,
- Wenjing Tian,
- Jinbang Yuan,
- Yanmin Liu,
- Qinghao Yan,
- Qinghu Yang,
- Chengshuo Shen,
- Weixin Guo,
- Lu Wang,
- Lin Nie,
- Zhanhui Wang,
- Guangzhou Hao,
- Nengchao Wang,
- Zhongyong Chen,
- Yuan Pan,
- Jiquan Li,
- Wei Chen,
- Wulyu Zhong
Affiliations
- Ting Long
- ORCiD
- Southwestern Institute of Physics , Chengdu, China
- P.H. Diamond
- ORCiD
- Departments of Astronomy, Astrophysics and Physics, University of California , San Diego, CA, United States of America
- Rui Ke
- ORCiD
- Southwestern Institute of Physics , Chengdu, China
- Zhipeng Chen
- ORCiD
- State Key Laboratory of Advanced Electromagnetic Technology, International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology , Wuhan 430074, China
- Mingyun Cao
- ORCiD
- Departments of Astronomy, Astrophysics and Physics, University of California , San Diego, CA, United States of America
- Xin Xu
- State Key Laboratory of Advanced Electromagnetic Technology, International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology , Wuhan 430074, China
- Min Xu
- Southwestern Institute of Physics , Chengdu, China
- Rongjie Hong
- ORCiD
- University of California , Los Angeles, CA, United States of America
- Wenjing Tian
- Southwestern Institute of Physics , Chengdu, China; Tsinghua University , Beijing, China
- Jinbang Yuan
- ORCiD
- Southwestern Institute of Physics , Chengdu, China
- Yanmin Liu
- Southwestern Institute of Physics , Chengdu, China
- Qinghao Yan
- Southwestern Institute of Physics , Chengdu, China
- Qinghu Yang
- State Key Laboratory of Advanced Electromagnetic Technology, International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology , Wuhan 430074, China
- Chengshuo Shen
- State Key Laboratory of Advanced Electromagnetic Technology, International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology , Wuhan 430074, China
- Weixin Guo
- ORCiD
- State Key Laboratory of Advanced Electromagnetic Technology, International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology , Wuhan 430074, China
- Lu Wang
- ORCiD
- State Key Laboratory of Advanced Electromagnetic Technology, International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology , Wuhan 430074, China
- Lin Nie
- Southwestern Institute of Physics , Chengdu, China
- Zhanhui Wang
- Southwestern Institute of Physics , Chengdu, China
- Guangzhou Hao
- ORCiD
- Southwestern Institute of Physics , Chengdu, China
- Nengchao Wang
- ORCiD
- State Key Laboratory of Advanced Electromagnetic Technology, International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology , Wuhan 430074, China
- Zhongyong Chen
- ORCiD
- State Key Laboratory of Advanced Electromagnetic Technology, International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology , Wuhan 430074, China
- Yuan Pan
- State Key Laboratory of Advanced Electromagnetic Technology, International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology , Wuhan 430074, China
- Jiquan Li
- Southwestern Institute of Physics , Chengdu, China
- Wei Chen
- ORCiD
- Southwestern Institute of Physics , Chengdu, China
- Wulyu Zhong
- Southwestern Institute of Physics , Chengdu, China
- DOI
- https://doi.org/10.1088/1741-4326/ad40c0
- Journal volume & issue
-
Vol. 64,
no. 6
p. 064002
Abstract
We report on comprehensive experimental studies of turbulence spreading in edge plasmas. These studies demonstrate the relation of turbulence spreading and entrainment to intermittent convective density fluctuation events or bursts (i.e. blobs and holes). The non-diffusive character of turbulence spreading is thus elucidated. The turbulence spreading velocity (or mean jet velocity) manifests a linear correlation with the skewness of density fluctuations, and increases with the auto-correlation time of density fluctuations. Turbulence spreading by positive density fluctuations is outward, while spreading by negative density fluctuations is inward. The degree of symmetry breaking between outward propagating blobs and inward propagating holes increases with the amplitude of density fluctuations. Thus, blob-hole asymmetry emerges as crucial to turbulence spreading. These results highlight the important role of intermittent convective events in conveying the spreading of turbulence, and constitute a fundamental challenge to existing diffusive models of spreading.
Keywords
