An ASIPP Paper on L-H Transition Power Threshold is “Most Read” in NF April Issue
count: [2016-05-30]

Recently, one research work, titled as “Study on the L - H transition power threshold with RF heating and lithium - wall coating on EAST”, by L. Chen, G. S. Xu et al of the tokamak division, ASIPP was selected as one of the most popular paper with readers in Nuclear Fusion (2016 Nuclear Fusion 56056013). 

Since the power available in the initial phase of ITER operation is limited, accessing the H-mode with a heating power as low as possible is a crucial issue. H-mode by limited radio-frequency wave heating power under lithium wall condition, with respect to different field direction and magnetic configuration, has been accessed in 2010 and 2012 EAST experimental campaign, respectively. 

 A comparison of the L-H power threshold and transition behavior for different field direction and magnetic field configuration was carried out by L. Chen, G. S. Xu et al. As indicated in the paper, a minimum power threshold is found in double null configuration, and when operates at single null configuration, L-H power threshold is lower for the ion grad-B drift away from the primary X-point. These results enrich the L-H power threshold studies in predominantly RF-heated plasma, which has significance for the H-mode operation of ITER. 

 The effect of lithium wall conditions on the power threshold was also discussed, and the role of SOL flow on the L-H power threshold was also analyzed in the paper. A reasonable explanation and new point of view were put forward, which has received extensive interest from home and abroad. 

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