Internal measurements of electromagnetic geodesic acoustic mode (GAM) in EAST plasmas-Reference-Cited by-同舟云学术

Internal measurements of electromagnetic geodesic acoustic mode (GAM) in EAST plasmas

Published:2024-09-01 Issue:9 Volume:31 Page:
ISSN:1070-664X
Container-title:Physics of Plasmas
language:en
Short-container-title:

Author:

Wang Y. H.¹^ORCID,Ding W. X.¹²^ORCID,Zhou C.¹^ORCID,Liu A. D.¹^ORCID,Feng X.¹^ORCID,Lian H.²³^ORCID,Liu H. Q.³^ORCID,Chu Y. Q.²³,Brower D. L.²^ORCID,Mao W. Z.¹^ORCID,Xie J. L.¹^ORCID,Gao L. T.¹,Zhu R. J.¹³^ORCID,Zhong X. M.¹⁴⁵^ORCID,Ren H. J.⁶⁷^ORCID,Chen Z.⁶^ORCID,Shi W. X.¹,Wang S. F.¹

Affiliation:

1. School of Nuclear Science and Technology, University of Science and Technology of China 1 , Anhui Hefei 230026, China

2. Department of Physics and Astronomy, University of California Los Angeles 2 , Los Angeles, California 90095, USA

3. Institute of Plasma Physics, Chinese Academy of Sciences 3 , Anhui Hefei 230021, China

4. College of Physics and Optoelectronic Engineering, Shenzhen University 4 , Shenzhen 518060, China

5. Advanced Energy Research Center, Shenzhen University 5 , Shenzhen 518060, China

6. CAS Key Laboratory of Geospace Environment and Department of Engineering and Applied Physics, School of Physical Sciences, University of Science and Technology of China 6 , Anhui Hefei 230026, China

7. Culham Centre for Fusion Energy 7 , Abingdo OX14 3DB, United Kingdom

Abstract

Velocity, density, and magnetic fluctuations of the geodesic acoustic mode (GAM) have been measured using the Doppler backscattering system, Faraday-effect polarimeter-interferometer, and external pick-up coils in the Experimental Advanced Superconducting Tokamak. Simultaneous measurements of density and velocity fluctuations at the midplane and top of plasmas demonstrate that m = 1 density fluctuations are quantitatively balanced by the compression of perpendicular flow fluctuations. Furthermore, internal magnetic fluctuations associated with GAM have now been directly measured by laser-based Faraday-effect polarimetry for the first time. Line-averaged magnetic fluctuations (up to 16 Gauss, B̃¯R,GAMBT∼0.066%) are significantly larger than those extrapolated from edge coils (a few Gauss) and that magnetic fluctuations increase with β. The observed discrepancy between finite β theory and experimental data indicates the need for further theoretical investigations.

Funder

National Natural Science Foundation of China

U.S. Department of Energy

Publisher

AIP Publishing

Link

https://pubs.aip.org/aip/pop/article-pdf/doi/10.1063/5.0211489/20145838/092503_1_5.0211489.pdf

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