Journal
PHYSICAL REVIEW LETTERS
Volume 117, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.117.145002
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Funding
- National Magnetic Confinement Fusion Science Program [2014GB108004, 2013GB107001, 2014GB107000, 2013GB112008]
- fund of State Key Laboratory of Advanced Electromagnetic Engineering and Technology in HUST [2016KF008]
- National Science Foundation of China [11175060, 11375054, 91130031, 11320101005]
- Department of Energy [DE-FG02-04ER54738]
- WCI Program of the National Research Foundation of Korea - Ministry of Education, Science and Technology of Korea [WCI 2009-001]
- [15H02155]
- [15H02335]
- [16H02442]
- Grants-in-Aid for Scientific Research [16H02442, 15H02155] Funding Source: KAKEN
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The synchronization of geodesic acoustic modes (GAMs) and magnetic fluctuations is identified in the edge plasmas of the HL-2A tokamak. Mesoscale electric fluctuations (MSEFs) having components of a dominant GAM, and m/n = 6/2 potential fluctuations are found at the same frequency as that of the magnetic fluctuations of m/n = 6/2 (m and n are poloidal and toroidal mode numbers, respectively). The temporal evolutions of the MSEFs and the magnetic fluctuations clearly show the frequency entrainment and the phase lock between the GAM and the m/n = 6/2 magnetic fluctuations. The results indicate that GAMs and magnetic fluctuations can transfer energy through nonlinear synchronization. Such nonlinear synchronization may also contribute to low-frequency zonal flow formation, reduction of turbulence level, and thus confinement regime transitions.
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