Funding for this research was provided by:
the Sichuan Province Science Foundation (2018JY0003, 2017JY0057)
the National Magnetic Confinement Fusion Science Program (2013 GB114003-1, 2013GB110001)
the 863 Program (2014AA032701)
Article History
Received: 12 June 2018
Accepted: 12 October 2018
First Online: 6 November 2018