Funding for this research was provided by:
National Magnetic Confinement Fusion Science Program (2014GB111006B)
National Magnetic Confinement Fusion Science Program (2017YFE0300304)
Article History
Received: 13 January 2018
Accepted: 2 May 2018
First Online: 9 May 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.