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Jiangang FANG, Zhongyong CHEN, Wei YAN, Nengchao WANG, Feiyue MAO, Qiang LUO, Zijian XUAN, Xixuan CHEN, Zhengkang REN, Feng ZHANG, Mei HUANG, Donghui XIA, Zhoujun YANG, Zhipeng CHEN, Yonghua DING, the J-TEXT Team. Suppression of the m/n = 2/1 tearing mode by electron cyclotron resonance heating on J-TEXT[J]. Plasma Science and Technology, 2024, 26(8): 085101. DOI: 10.1088/2058-6272/ad3616
Citation: Jiangang FANG, Zhongyong CHEN, Wei YAN, Nengchao WANG, Feiyue MAO, Qiang LUO, Zijian XUAN, Xixuan CHEN, Zhengkang REN, Feng ZHANG, Mei HUANG, Donghui XIA, Zhoujun YANG, Zhipeng CHEN, Yonghua DING, the J-TEXT Team. Suppression of the m/n = 2/1 tearing mode by electron cyclotron resonance heating on J-TEXT[J]. Plasma Science and Technology, 2024, 26(8): 085101. DOI: 10.1088/2058-6272/ad3616

Suppression of the m/n = 2/1 tearing mode by electron cyclotron resonance heating on J-TEXT

  • Stabilization of tearing modes and neoclassical tearing modes is of great importance for tokamak operation. Electron cyclotron waves (ECWs) have been extensively used to stabilize the tearing modes with the virtue of highly localized power deposition. Complete suppression of the m/n = 2/1 tearing mode (TM) by electron cyclotron resonance heating (ECRH) has been achieved successfully on the J-TEXT tokamak. The effects of ECW deposition location and power amplitude on the 2/1 TM suppression have been investigated. It is found that the suppression is more effective when the ECW power is deposited closer to the rational surface. As the ECW power increases to approximately 230 kW, the 2/1 TM can be completely suppressed. The island rotation frequency is increased when the island width is reduced. The experimental results show that the local heating inside the magnetic island and the resulting temperature perturbation increase at the O-point of the island play dominant roles in TM suppression. As the ECW power increases, the 2/1 island is suppressed to smaller island width, and the flow shear also plays a stabilizing effect on small magnetic islands. With the stabilizing contribution of heating and flow shear, the 2/1 TM can be completely suppressed.
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