Supported by the National Natural Science Foundation of China under Grant No 11347002, the National Magnetic Confinement Fusion Science Program of China under Grant No 2013GBl11000, the Outstanding Youth Fund of Hunan Province Education Department of China under Grant No 12B107, the JSPS-NRF-NSFC A3 Foresight Program in the field of Plasma Physics under Grant No 11261140328, and the National Research Foundation 2012K2A2A6000443.