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Whytea, D.G., Hubbard, A.E., Hughes, J.W., Lipschultz, B., Rice, J.E., Marmar, E.S., Greenwald, M., Cziegler, I., Dominguez, A., Golfinopoulos, T., Howard, N., Lin, L., McDermottb, R.M., Porkolab, M., Reinke, M.L., Terry, J., Tsujii, N., Wolfe, S., Wukitch, S., Lin, Y. and the Alcator C-Mod Team (2010) I-Mode: An H-Mode Energy Confinement Regime with L-Mode Particle Transport in Alcator C-Mod. Nuclear Fusion, 50, 105005.

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• TITLE: Mitigation of ELMs by Electrostatic Field in Tokamaks

  AUTHORS: Zhongtian Wang, Xiaochang Chen, Yifan Yan, Huidong Li, Qian Liu, Maolin Mou, Na Wu, Zhanhui Wang, Rui Ke, Lin Nie, Ming Xu

  KEYWORDS: Electrostatic Trapping, Bootstrap Current, Mitigation, Peeling-Ballooning Mode

  JOURNAL NAME: Journal of High Energy Physics, Gravitation and Cosmology, Vol.5 No.1, December 20, 2018

  ABSTRACT: Mitigation of ELMs by electrostatic field is studied. The perpendicular heating in cyclotron waves tends to pile up the resonant particles toward the low magnetic field side in which a electrostatic field may result [J. Y. Hsu, V. S. Chan, R. W. Harvey, R. Prater, and S. K. Wong, Phys. Rev. Lett. 53, 564 (1984)]. The electrostatic field can make circulating particles trapped or make trapped particles circulating depending on the field direction. The trapped- particle population and bootstrap current change accordantly. Modulating bootstrap current, mitigation of type-1 ELM by the electrostatic field is possible. The electrostatic potential needed for the mitigation is quantitatively estimated. Experiments by either ECRH or biasing are being prepared to verify the theory.