ELM control or mitigation is a hot issue in future fusion device, such as ITER. Recent experimental results on ELM mitigation by Supersonic Molecular Beam Injection (SMBI) on HL-2A and KSTAR have been performed successfully. The signatures of ELM mitigation by SMBI are an ELM frequency increase and ELM amplitude decrease which persist for an SMBI influence time τI (τI duration for the SMBI influenced pedestal profile to refill). An increase in fELMSMBI/fELM0~2-3.5 and a decrease of the energy loss per ELM ΔWELM were achieved. Physical insight was gleaned from studies of density and vФ evolution, particle flux and turbulence spectra, divertor heat load and ELM filament structures. We note that τI/τp (particle confinement time) is close to ~1, although there is a large difference in individual τI between the two machines. This suggests that τI is strongly related to particle transport events during ELM mitigation by SMBI. Experiments and theory support the important conclusion that ELM mitigation by SMBI results from an increase in higher frequency fluctuations and transport events in the pedestal, and inhibits the occurrence of large transport events which span the entire pedestal width.

Dr. Xiao graduated from Anhui University of Science and Technology in 2000. He obtained the Master degree and Doctor degree in 2006 and 2009, respectively. He works in SWIP since 2003. During this period, Dr. Xiao worked in CEA France (2008-01-06, 2009- 02-07), and short visited in Kyoto Univ. and in UCSD. Dr. Xiao was promoted to associate professor in Nov., 2010 in SWIP. Since Dec., 2010, as visiting researcher, Dr. Xiao works in WCI Center for Fusion Theory, which is leaded by Prof. Diamond.

Dr. Xiao has received Excellent scientific paper award from Korea Nuclear Society (2012), Hu Ji-Min Education and Science Award (2010)，S. T. Tsai Award for Young Chinese Plasma Physicists (2010)，National Defense Science and Technology Award (2006)，CNNC Science and technology Award (2006)，respectively.

Dr. Xiao’s research interests include ELM control and physics, tokamak Plasma confinement and transport, and plasma microwave diagnostics. His recent work on new investigation of ELM mitigation was presented as an oral presentation at 24th IAEA Fusion energy conference in San Diego this year.